5 #define COLLISION_EDGEDIR_DOT_EPSILON (0.999f)
6 #define COLLISION_EDGECROSS_MINLENGTH2 (1.0f / 4194304.0f)
7 #define COLLISION_SNAPSCALE (32.0f)
8 #define COLLISION_SNAP (1.0f / COLLISION_SNAPSCALE)
9 #define COLLISION_SNAP2 (2.0f / COLLISION_SNAPSCALE)
10 #define COLLISION_PLANE_DIST_EPSILON (2.0f / COLLISION_SNAPSCALE)
12 cvar_t collision_impactnudge = {0, "collision_impactnudge", "0.03125", "how much to back off from the impact"};
13 cvar_t collision_extendmovelength = {0, "collision_extendmovelength", "16", "internal bias on trace length to ensure detection of collisions within the collision_impactnudge distance so that short moves do not degrade across frames (this does not alter the final trace length)"};
14 cvar_t collision_extendtraceboxlength = {0, "collision_extendtraceboxlength", "1", "internal bias for tracebox() qc builtin to account for collision_impactnudge (this does not alter the final trace length)"};
15 cvar_t collision_extendtracelinelength = {0, "collision_extendtracelinelength", "1", "internal bias for traceline() qc builtin to account for collision_impactnudge (this does not alter the final trace length)"};
16 cvar_t collision_debug_tracelineasbox = {0, "collision_debug_tracelineasbox", "0", "workaround for any bugs in Collision_TraceLineBrushFloat by using Collision_TraceBrushBrushFloat"};
17 cvar_t collision_cache = {0, "collision_cache", "1", "store results of collision traces for next frame to reuse if possible (optimization)"};
18 //cvar_t collision_triangle_neighborsides = {0, "collision_triangle_neighborsides", "1", "override automatic side generation if triangle has neighbors with face planes that form a convex edge (perfect solution, but can not work for all edges)"};
19 cvar_t collision_triangle_bevelsides = {0, "collision_triangle_bevelsides", "0", "generate sloped edge planes on triangles - if 0, see axialedgeplanes"};
20 cvar_t collision_triangle_axialsides = {0, "collision_triangle_axialsides", "1", "generate axially-aligned edge planes on triangles - otherwise use perpendicular edge planes"};
22 mempool_t *collision_mempool;
24 void Collision_Init (void)
26 Cvar_RegisterVariable(&collision_impactnudge);
27 Cvar_RegisterVariable(&collision_extendmovelength);
28 Cvar_RegisterVariable(&collision_extendtracelinelength);
29 Cvar_RegisterVariable(&collision_extendtraceboxlength);
30 Cvar_RegisterVariable(&collision_debug_tracelineasbox);
31 Cvar_RegisterVariable(&collision_cache);
32 // Cvar_RegisterVariable(&collision_triangle_neighborsides);
33 Cvar_RegisterVariable(&collision_triangle_bevelsides);
34 Cvar_RegisterVariable(&collision_triangle_axialsides);
35 collision_mempool = Mem_AllocPool("collision cache", 0, NULL);
36 Collision_Cache_Init(collision_mempool);
52 static void Collision_PrintBrushAsQHull(colbrushf_t *brush, const char *name)
55 Con_Printf("3 %s\n%i\n", name, brush->numpoints);
56 for (i = 0;i < brush->numpoints;i++)
57 Con_Printf("%f %f %f\n", brush->points[i].v[0], brush->points[i].v[1], brush->points[i].v[2]);
59 Con_Printf("4\n%i\n", brush->numplanes);
60 for (i = 0;i < brush->numplanes;i++)
61 Con_Printf("%f %f %f %f\n", brush->planes[i].normal[0], brush->planes[i].normal[1], brush->planes[i].normal[2], brush->planes[i].dist);
64 static void Collision_ValidateBrush(colbrushf_t *brush)
66 int j, k, pointsoffplanes, pointonplanes, pointswithinsufficientplanes, printbrush;
69 if (!brush->numpoints)
71 Con_Print("Collision_ValidateBrush: brush with no points!\n");
75 // it's ok for a brush to have one point and no planes...
76 if (brush->numplanes == 0 && brush->numpoints != 1)
78 Con_Print("Collision_ValidateBrush: brush with no planes and more than one point!\n");
85 pointswithinsufficientplanes = 0;
86 for (k = 0;k < brush->numplanes;k++)
87 if (DotProduct(brush->planes[k].normal, brush->planes[k].normal) < 0.0001f)
88 Con_Printf("Collision_ValidateBrush: plane #%i (%f %f %f %f) is degenerate\n", k, brush->planes[k].normal[0], brush->planes[k].normal[1], brush->planes[k].normal[2], brush->planes[k].dist);
89 for (j = 0;j < brush->numpoints;j++)
92 for (k = 0;k < brush->numplanes;k++)
94 d = DotProduct(brush->points[j].v, brush->planes[k].normal) - brush->planes[k].dist;
95 if (d > COLLISION_PLANE_DIST_EPSILON)
97 Con_Printf("Collision_ValidateBrush: point #%i (%f %f %f) infront of plane #%i (%f %f %f %f)\n", j, brush->points[j].v[0], brush->points[j].v[1], brush->points[j].v[2], k, brush->planes[k].normal[0], brush->planes[k].normal[1], brush->planes[k].normal[2], brush->planes[k].dist);
100 if (fabs(d) > COLLISION_PLANE_DIST_EPSILON)
105 if (pointonplanes < 3)
106 pointswithinsufficientplanes++;
108 if (pointswithinsufficientplanes)
110 Con_Print("Collision_ValidateBrush: some points have insufficient planes, every point must be on at least 3 planes to form a corner.\n");
113 if (pointsoffplanes == 0) // all points are on all planes
115 Con_Print("Collision_ValidateBrush: all points lie on all planes (degenerate, no brush volume!)\n");
120 Collision_PrintBrushAsQHull(brush, "unnamed");
123 static float nearestplanedist_float(const float *normal, const colpointf_t *points, int numpoints)
125 float dist, bestdist;
128 bestdist = DotProduct(points->v, normal);
132 dist = DotProduct(points->v, normal);
133 bestdist = min(bestdist, dist);
139 static float furthestplanedist_float(const float *normal, const colpointf_t *points, int numpoints)
141 float dist, bestdist;
144 bestdist = DotProduct(points->v, normal);
148 dist = DotProduct(points->v, normal);
149 bestdist = max(bestdist, dist);
155 static void Collision_CalcEdgeDirsForPolygonBrushFloat(colbrushf_t *brush)
158 for (i = 0, j = brush->numpoints - 1;i < brush->numpoints;j = i, i++)
159 VectorSubtract(brush->points[i].v, brush->points[j].v, brush->edgedirs[j].v);
162 colbrushf_t *Collision_NewBrushFromPlanes(mempool_t *mempool, int numoriginalplanes, const colplanef_t *originalplanes, int supercontents, int q3surfaceflags, const texture_t *texture, int hasaabbplanes)
164 // TODO: planesbuf could be replaced by a remapping table
165 int j, k, w, xyzflags;
166 int numpointsbuf = 0, maxpointsbuf = 256, numedgedirsbuf = 0, maxedgedirsbuf = 256, numplanesbuf = 0, maxplanesbuf = 256, numelementsbuf = 0, maxelementsbuf = 256;
170 colpointf_t pointsbuf[256];
171 colpointf_t edgedirsbuf[256];
172 colplanef_t planesbuf[256];
173 int elementsbuf[1024];
174 int polypointbuf[256];
179 // enable these if debugging to avoid seeing garbage in unused data-
180 memset(pointsbuf, 0, sizeof(pointsbuf));
181 memset(edgedirsbuf, 0, sizeof(edgedirsbuf));
182 memset(planesbuf, 0, sizeof(planesbuf));
183 memset(elementsbuf, 0, sizeof(elementsbuf));
184 memset(polypointbuf, 0, sizeof(polypointbuf));
185 memset(p, 0, sizeof(p));
188 // check if there are too many planes and skip the brush
189 if (numoriginalplanes >= maxplanesbuf)
191 Con_DPrint("Collision_NewBrushFromPlanes: failed to build collision brush: too many planes for buffer\n");
195 // figure out how large a bounding box we need to properly compute this brush
197 for (j = 0;j < numoriginalplanes;j++)
198 maxdist = max(maxdist, fabs(originalplanes[j].dist));
199 // now make it large enough to enclose the entire brush, and round it off to a reasonable multiple of 1024
200 maxdist = floor(maxdist * (4.0 / 1024.0) + 2) * 1024.0;
201 // construct a collision brush (points, planes, and renderable mesh) from
202 // a set of planes, this also optimizes out any unnecessary planes (ones
203 // whose polygon is clipped away by the other planes)
204 for (j = 0;j < numoriginalplanes;j++)
208 VectorCopy(originalplanes[j].normal, planesbuf[numplanesbuf].normal);
209 planesbuf[numplanesbuf].dist = originalplanes[j].dist;
210 planesbuf[numplanesbuf].q3surfaceflags = originalplanes[j].q3surfaceflags;
211 planesbuf[numplanesbuf].texture = originalplanes[j].texture;
214 // create a large polygon from the plane
216 PolygonD_QuadForPlane(p[w], originalplanes[j].normal[0], originalplanes[j].normal[1], originalplanes[j].normal[2], originalplanes[j].dist, maxdist);
218 // clip it by all other planes
219 for (k = 0;k < numoriginalplanes && pnumpoints >= 3 && pnumpoints <= pmaxpoints;k++)
221 // skip the plane this polygon
222 // (nothing happens if it is processed, this is just an optimization)
225 // we want to keep the inside of the brush plane so we flip
227 PolygonD_Divide(pnumpoints, p[w], -originalplanes[k].normal[0], -originalplanes[k].normal[1], -originalplanes[k].normal[2], -originalplanes[k].dist, COLLISION_PLANE_DIST_EPSILON, pmaxpoints, p[!w], &pnumpoints, 0, NULL, NULL, NULL);
232 // if nothing is left, skip it
235 //Con_DPrintf("Collision_NewBrushFromPlanes: warning: polygon for plane %f %f %f %f clipped away\n", originalplanes[j].normal[0], originalplanes[j].normal[1], originalplanes[j].normal[2], originalplanes[j].dist);
239 for (k = 0;k < pnumpoints;k++)
243 for (l = 0;l < numoriginalplanes;l++)
244 if (fabs(DotProduct(&p[w][k*3], originalplanes[l].normal) - originalplanes[l].dist) < COLLISION_PLANE_DIST_EPSILON)
251 Con_DPrintf("Collision_NewBrushFromPlanes: warning: polygon point does not lie on at least 3 planes\n");
255 // check if there are too many polygon vertices for buffer
256 if (pnumpoints > pmaxpoints)
258 Con_DPrint("Collision_NewBrushFromPlanes: failed to build collision brush: too many points for buffer\n");
262 // check if there are too many triangle elements for buffer
263 if (numelementsbuf + (pnumpoints - 2) * 3 > maxelementsbuf)
265 Con_DPrint("Collision_NewBrushFromPlanes: failed to build collision brush: too many triangle elements for buffer\n");
269 // add the unique points for this polygon
270 for (k = 0;k < pnumpoints;k++)
274 // downgrade to float precision before comparing
275 VectorCopy(&p[w][k*3], v);
277 // check if there is already a matching point (no duplicates)
278 for (m = 0;m < numpointsbuf;m++)
279 if (VectorDistance2(v, pointsbuf[m].v) < COLLISION_SNAP2)
282 // if there is no match, add a new one
283 if (m == numpointsbuf)
285 // check if there are too many and skip the brush
286 if (numpointsbuf >= maxpointsbuf)
288 Con_DPrint("Collision_NewBrushFromPlanes: failed to build collision brush: too many points for buffer\n");
292 VectorCopy(&p[w][k*3], pointsbuf[numpointsbuf].v);
296 // store the index into a buffer
300 // add the triangles for the polygon
301 // (this particular code makes a triangle fan)
302 for (k = 0;k < pnumpoints - 2;k++)
304 elementsbuf[numelementsbuf++] = polypointbuf[0];
305 elementsbuf[numelementsbuf++] = polypointbuf[k + 1];
306 elementsbuf[numelementsbuf++] = polypointbuf[k + 2];
309 // add the unique edgedirs for this polygon
310 for (k = 0, n = pnumpoints-1;k < pnumpoints;n = k, k++)
314 // downgrade to float precision before comparing
315 VectorSubtract(&p[w][k*3], &p[w][n*3], dir);
316 VectorNormalize(dir);
318 // check if there is already a matching edgedir (no duplicates)
319 for (m = 0;m < numedgedirsbuf;m++)
320 if (DotProduct(dir, edgedirsbuf[m].v) >= COLLISION_EDGEDIR_DOT_EPSILON)
322 // skip this if there is
323 if (m < numedgedirsbuf)
326 // try again with negated edgedir
327 VectorNegate(dir, dir);
328 // check if there is already a matching edgedir (no duplicates)
329 for (m = 0;m < numedgedirsbuf;m++)
330 if (DotProduct(dir, edgedirsbuf[m].v) >= COLLISION_EDGEDIR_DOT_EPSILON)
332 // if there is no match, add a new one
333 if (m == numedgedirsbuf)
335 // check if there are too many and skip the brush
336 if (numedgedirsbuf >= maxedgedirsbuf)
338 Con_DPrint("Collision_NewBrushFromPlanes: failed to build collision brush: too many edgedirs for buffer\n");
342 VectorCopy(dir, edgedirsbuf[numedgedirsbuf].v);
347 // if any normal is not purely axial, it's not an axis-aligned box
348 if (isaabb && (originalplanes[j].normal[0] == 0) + (originalplanes[j].normal[1] == 0) + (originalplanes[j].normal[2] == 0) < 2)
352 // if nothing is left, there's nothing to allocate
353 if (numplanesbuf < 4)
355 Con_DPrintf("Collision_NewBrushFromPlanes: failed to build collision brush: %i triangles, %i planes (input was %i planes), %i vertices\n", numelementsbuf / 3, numplanesbuf, numoriginalplanes, numpointsbuf);
359 // if no triangles or points could be constructed, then this routine failed but the brush is not discarded
360 if (numelementsbuf < 12 || numpointsbuf < 4)
361 Con_DPrintf("Collision_NewBrushFromPlanes: unable to rebuild triangles/points for collision brush: %i triangles, %i planes (input was %i planes), %i vertices\n", numelementsbuf / 3, numplanesbuf, numoriginalplanes, numpointsbuf);
363 // validate plane distances
364 for (j = 0;j < numplanesbuf;j++)
366 float d = furthestplanedist_float(planesbuf[j].normal, pointsbuf, numpointsbuf);
367 if (fabs(planesbuf[j].dist - d) > COLLISION_PLANE_DIST_EPSILON)
368 Con_DPrintf("plane %f %f %f %f mismatches dist %f\n", planesbuf[j].normal[0], planesbuf[j].normal[1], planesbuf[j].normal[2], planesbuf[j].dist, d);
371 // allocate the brush and copy to it
372 brush = (colbrushf_t *)Mem_Alloc(mempool, sizeof(colbrushf_t) + sizeof(colpointf_t) * numpointsbuf + sizeof(colpointf_t) * numedgedirsbuf + sizeof(colplanef_t) * numplanesbuf + sizeof(int) * numelementsbuf);
373 brush->isaabb = isaabb;
374 brush->hasaabbplanes = hasaabbplanes;
375 brush->supercontents = supercontents;
376 brush->numplanes = numplanesbuf;
377 brush->numedgedirs = numedgedirsbuf;
378 brush->numpoints = numpointsbuf;
379 brush->numtriangles = numelementsbuf / 3;
380 brush->planes = (colplanef_t *)(brush + 1);
381 brush->points = (colpointf_t *)(brush->planes + brush->numplanes);
382 brush->edgedirs = (colpointf_t *)(brush->points + brush->numpoints);
383 brush->elements = (int *)(brush->points + brush->numpoints);
384 brush->q3surfaceflags = q3surfaceflags;
385 brush->texture = texture;
386 for (j = 0;j < brush->numpoints;j++)
388 brush->points[j].v[0] = pointsbuf[j].v[0];
389 brush->points[j].v[1] = pointsbuf[j].v[1];
390 brush->points[j].v[2] = pointsbuf[j].v[2];
392 for (j = 0;j < brush->numedgedirs;j++)
394 brush->edgedirs[j].v[0] = edgedirsbuf[j].v[0];
395 brush->edgedirs[j].v[1] = edgedirsbuf[j].v[1];
396 brush->edgedirs[j].v[2] = edgedirsbuf[j].v[2];
398 for (j = 0;j < brush->numplanes;j++)
400 brush->planes[j].normal[0] = planesbuf[j].normal[0];
401 brush->planes[j].normal[1] = planesbuf[j].normal[1];
402 brush->planes[j].normal[2] = planesbuf[j].normal[2];
403 brush->planes[j].dist = planesbuf[j].dist;
404 brush->planes[j].q3surfaceflags = planesbuf[j].q3surfaceflags;
405 brush->planes[j].texture = planesbuf[j].texture;
407 for (j = 0;j < brush->numtriangles * 3;j++)
408 brush->elements[j] = elementsbuf[j];
411 VectorClear(brush->mins);
412 VectorClear(brush->maxs);
413 for (j = 0;j < min(6, numoriginalplanes);j++)
415 if (originalplanes[j].normal[0] == 1) {xyzflags |= 1;brush->maxs[0] = originalplanes[j].dist;}
416 else if (originalplanes[j].normal[0] == -1) {xyzflags |= 2;brush->mins[0] = -originalplanes[j].dist;}
417 else if (originalplanes[j].normal[1] == 1) {xyzflags |= 4;brush->maxs[1] = originalplanes[j].dist;}
418 else if (originalplanes[j].normal[1] == -1) {xyzflags |= 8;brush->mins[1] = -originalplanes[j].dist;}
419 else if (originalplanes[j].normal[2] == 1) {xyzflags |= 16;brush->maxs[2] = originalplanes[j].dist;}
420 else if (originalplanes[j].normal[2] == -1) {xyzflags |= 32;brush->mins[2] = -originalplanes[j].dist;}
422 // if not all xyzflags were set, then this is not a brush from q3map/q3map2, and needs reconstruction of the bounding box
423 // (this case works for any brush with valid points, but sometimes brushes are not reconstructed properly and hence the points are not valid, so this is reserved as a fallback case)
426 VectorCopy(brush->points[0].v, brush->mins);
427 VectorCopy(brush->points[0].v, brush->maxs);
428 for (j = 1;j < brush->numpoints;j++)
430 brush->mins[0] = min(brush->mins[0], brush->points[j].v[0]);
431 brush->mins[1] = min(brush->mins[1], brush->points[j].v[1]);
432 brush->mins[2] = min(brush->mins[2], brush->points[j].v[2]);
433 brush->maxs[0] = max(brush->maxs[0], brush->points[j].v[0]);
434 brush->maxs[1] = max(brush->maxs[1], brush->points[j].v[1]);
435 brush->maxs[2] = max(brush->maxs[2], brush->points[j].v[2]);
444 Collision_ValidateBrush(brush);
450 void Collision_CalcPlanesForTriangleBrushFloat(colbrushf_t *brush)
452 float edge0[3], edge1[3], edge2[3];
455 TriangleNormal(brush->points[0].v, brush->points[1].v, brush->points[2].v, brush->planes[0].normal);
456 if (DotProduct(brush->planes[0].normal, brush->planes[0].normal) < 0.0001f)
458 // there's no point in processing a degenerate triangle (GIGO - Garbage In, Garbage Out)
459 // note that some of these exist in q3bsp bspline patches
460 brush->numplanes = 0;
464 // there are 5 planes (front, back, sides) and 3 edges
465 brush->numplanes = 5;
466 brush->numedgedirs = 3;
467 VectorNormalize(brush->planes[0].normal);
468 brush->planes[0].dist = DotProduct(brush->points->v, brush->planes[0].normal);
469 VectorNegate(brush->planes[0].normal, brush->planes[1].normal);
470 brush->planes[1].dist = -brush->planes[0].dist;
471 // edge directions are easy to calculate
472 VectorSubtract(brush->points[2].v, brush->points[0].v, edge0);
473 VectorSubtract(brush->points[0].v, brush->points[1].v, edge1);
474 VectorSubtract(brush->points[1].v, brush->points[2].v, edge2);
475 VectorCopy(edge0, brush->edgedirs[0].v);
476 VectorCopy(edge1, brush->edgedirs[1].v);
477 VectorCopy(edge2, brush->edgedirs[2].v);
478 // now select an algorithm to generate the side planes
479 if (collision_triangle_bevelsides.integer)
481 // use 45 degree slopes at the edges of the triangle to make a sinking trace error turn into "riding up" the slope rather than getting stuck
482 CrossProduct(edge0, brush->planes->normal, brush->planes[2].normal);
483 CrossProduct(edge1, brush->planes->normal, brush->planes[3].normal);
484 CrossProduct(edge2, brush->planes->normal, brush->planes[4].normal);
485 VectorNormalize(brush->planes[2].normal);
486 VectorNormalize(brush->planes[3].normal);
487 VectorNormalize(brush->planes[4].normal);
488 VectorAdd(brush->planes[2].normal, brush->planes[0].normal, brush->planes[2].normal);
489 VectorAdd(brush->planes[3].normal, brush->planes[0].normal, brush->planes[3].normal);
490 VectorAdd(brush->planes[4].normal, brush->planes[0].normal, brush->planes[4].normal);
491 VectorNormalize(brush->planes[2].normal);
492 VectorNormalize(brush->planes[3].normal);
493 VectorNormalize(brush->planes[4].normal);
495 else if (collision_triangle_axialsides.integer)
497 float projectionnormal[3], projectionedge0[3], projectionedge1[3], projectionedge2[3];
499 float dist, bestdist;
500 bestdist = fabs(brush->planes[0].normal[0]);
502 for (i = 1;i < 3;i++)
504 dist = fabs(brush->planes[0].normal[i]);
511 VectorClear(projectionnormal);
512 if (brush->planes[0].normal[best] < 0)
513 projectionnormal[best] = -1;
515 projectionnormal[best] = 1;
516 VectorCopy(edge0, projectionedge0);
517 VectorCopy(edge1, projectionedge1);
518 VectorCopy(edge2, projectionedge2);
519 projectionedge0[best] = 0;
520 projectionedge1[best] = 0;
521 projectionedge2[best] = 0;
522 CrossProduct(projectionedge0, projectionnormal, brush->planes[2].normal);
523 CrossProduct(projectionedge1, projectionnormal, brush->planes[3].normal);
524 CrossProduct(projectionedge2, projectionnormal, brush->planes[4].normal);
525 VectorNormalize(brush->planes[2].normal);
526 VectorNormalize(brush->planes[3].normal);
527 VectorNormalize(brush->planes[4].normal);
531 CrossProduct(edge0, brush->planes->normal, brush->planes[2].normal);
532 CrossProduct(edge1, brush->planes->normal, brush->planes[3].normal);
533 CrossProduct(edge2, brush->planes->normal, brush->planes[4].normal);
534 VectorNormalize(brush->planes[2].normal);
535 VectorNormalize(brush->planes[3].normal);
536 VectorNormalize(brush->planes[4].normal);
538 brush->planes[2].dist = DotProduct(brush->points[2].v, brush->planes[2].normal);
539 brush->planes[3].dist = DotProduct(brush->points[0].v, brush->planes[3].normal);
540 brush->planes[4].dist = DotProduct(brush->points[1].v, brush->planes[4].normal);
542 if (developer_extra.integer)
545 // validity check - will be disabled later
546 Collision_ValidateBrush(brush);
547 for (i = 0;i < brush->numplanes;i++)
550 for (j = 0, p = brush->points;j < brush->numpoints;j++, p++)
551 if (DotProduct(p->v, brush->planes[i].normal) > brush->planes[i].dist + COLLISION_PLANE_DIST_EPSILON)
552 Con_DPrintf("Error in brush plane generation, plane %i\n", i);
557 colbrushf_t *Collision_AllocBrushFromPermanentPolygonFloat(mempool_t *mempool, int numpoints, float *points, int supercontents, int q3surfaceflags, const texture_t *texture)
560 brush = (colbrushf_t *)Mem_Alloc(mempool, sizeof(colbrushf_t) + sizeof(colplanef_t) * (numpoints + 2) + sizeof(colpointf_t) * numpoints);
561 brush->isaabb = false;
562 brush->hasaabbplanes = false;
563 brush->supercontents = supercontents;
564 brush->numpoints = numpoints;
565 brush->numedgedirs = numpoints;
566 brush->numplanes = numpoints + 2;
567 brush->planes = (colplanef_t *)(brush + 1);
568 brush->points = (colpointf_t *)points;
569 brush->edgedirs = (colpointf_t *)(brush->planes + brush->numplanes);
570 brush->q3surfaceflags = q3surfaceflags;
571 brush->texture = texture;
572 Sys_Error("Collision_AllocBrushFromPermanentPolygonFloat: FIXME: this code needs to be updated to generate a mesh...");
576 // NOTE: start and end of each brush pair must have same numplanes/numpoints
577 void Collision_TraceBrushBrushFloat(trace_t *trace, const colbrushf_t *trace_start, const colbrushf_t *trace_end, const colbrushf_t *other_start, const colbrushf_t *other_end)
579 int nplane, nplane2, nedge1, nedge2, hitq3surfaceflags = 0;
580 int tracenumedgedirs = trace_start->numedgedirs;
581 //int othernumedgedirs = other_start->numedgedirs;
582 int tracenumpoints = trace_start->numpoints;
583 int othernumpoints = other_start->numpoints;
584 int numplanes1 = other_start->numplanes;
585 int numplanes2 = numplanes1 + trace_start->numplanes;
586 int numplanes3 = numplanes2 + trace_start->numedgedirs * other_start->numedgedirs * 2;
587 vec_t enterfrac = -1, leavefrac = 1, startdist, enddist, ie, f, imove, enterfrac2 = -1;
590 vec4_t newimpactplane;
591 const texture_t *hittexture = NULL;
592 vec_t startdepth = 1;
593 vec3_t startdepthnormal;
595 VectorClear(startdepthnormal);
596 Vector4Clear(newimpactplane);
598 // fast case for AABB vs compiled brushes (which begin with AABB planes and also have precomputed bevels for AABB collisions)
599 if (trace_start->isaabb && other_start->hasaabbplanes)
600 numplanes3 = numplanes2 = numplanes1;
602 // Separating Axis Theorem:
603 // if a supporting vector (plane normal) can be found that separates two
604 // objects, they are not colliding.
607 // reduce the size of one object to a point while enlarging the other to
608 // represent the space that point can not occupy.
610 // try every plane we can construct between the two brushes and measure
611 // the distance between them.
612 for (nplane = 0;nplane < numplanes3;nplane++)
614 if (nplane < numplanes1)
617 VectorCopy(other_start->planes[nplane2].normal, startplane);
618 VectorCopy(other_end->planes[nplane2].normal, endplane);
620 else if (nplane < numplanes2)
622 nplane2 = nplane - numplanes1;
623 VectorCopy(trace_start->planes[nplane2].normal, startplane);
624 VectorCopy(trace_end->planes[nplane2].normal, endplane);
628 // pick an edgedir from each brush and cross them
629 nplane2 = nplane - numplanes2;
630 nedge1 = nplane2 >> 1;
631 nedge2 = nedge1 / tracenumedgedirs;
632 nedge1 -= nedge2 * tracenumedgedirs;
635 CrossProduct(trace_start->edgedirs[nedge1].v, other_start->edgedirs[nedge2].v, startplane);
636 CrossProduct(trace_end->edgedirs[nedge1].v, other_end->edgedirs[nedge2].v, endplane);
640 CrossProduct(other_start->edgedirs[nedge2].v, trace_start->edgedirs[nedge1].v, startplane);
641 CrossProduct(other_end->edgedirs[nedge2].v, trace_end->edgedirs[nedge1].v, endplane);
643 if (VectorLength2(startplane) < COLLISION_EDGECROSS_MINLENGTH2 || VectorLength2(endplane) < COLLISION_EDGECROSS_MINLENGTH2)
644 continue; // degenerate crossproducts
645 VectorNormalize(startplane);
646 VectorNormalize(endplane);
648 startplane[3] = furthestplanedist_float(startplane, other_start->points, othernumpoints);
649 endplane[3] = furthestplanedist_float(startplane, other_end->points, othernumpoints);
650 startdist = nearestplanedist_float(startplane, trace_start->points, tracenumpoints) - startplane[3];
651 enddist = nearestplanedist_float(endplane, trace_end->points, tracenumpoints) - endplane[3];
652 //Con_Printf("%c%i: startdist = %f, enddist = %f, startdist / (startdist - enddist) = %f\n", nplane2 != nplane ? 'b' : 'a', nplane2, startdist, enddist, startdist / (startdist - enddist));
654 // aside from collisions, this is also used for error correction
655 if (startdist <= 0.0f && nplane < numplanes1 && (startdepth < startdist || startdepth == 1))
657 startdepth = startdist;
658 VectorCopy(startplane, startdepthnormal);
661 if (startdist > enddist)
669 imove = 1 / (startdist - enddist);
670 f = startdist * imove;
671 // check if this will reduce the collision time range
674 // reduced collision time range
676 // if the collision time range is now empty, no collision
677 if (enterfrac > leavefrac)
679 // calculate the nudged fraction and impact normal we'll
680 // need if we accept this collision later
681 enterfrac2 = (startdist - collision_impactnudge.value) * imove;
682 // if the collision would be further away than the trace's
683 // existing collision data, we don't care about this
685 if (enterfrac2 >= trace->fraction)
687 ie = 1.0f - enterfrac;
688 newimpactplane[0] = startplane[0] * ie + endplane[0] * enterfrac;
689 newimpactplane[1] = startplane[1] * ie + endplane[1] * enterfrac;
690 newimpactplane[2] = startplane[2] * ie + endplane[2] * enterfrac;
691 newimpactplane[3] = startplane[3] * ie + endplane[3] * enterfrac;
692 if (nplane < numplanes1)
694 // use the plane from other
696 hitq3surfaceflags = other_start->planes[nplane2].q3surfaceflags;
697 hittexture = other_start->planes[nplane2].texture;
699 else if (nplane < numplanes2)
701 // use the plane from trace
702 nplane2 = nplane - numplanes1;
703 hitq3surfaceflags = trace_start->planes[nplane2].q3surfaceflags;
704 hittexture = trace_start->planes[nplane2].texture;
708 hitq3surfaceflags = other_start->q3surfaceflags;
709 hittexture = other_start->texture;
716 // moving out of brush
722 f = startdist / (startdist - enddist);
723 // check if this will reduce the collision time range
726 // reduced collision time range
728 // if the collision time range is now empty, no collision
729 if (enterfrac > leavefrac)
736 // at this point we know the trace overlaps the brush because it was not
737 // rejected at any point in the loop above
739 // see if the trace started outside the brush or not
742 // started outside, and overlaps, therefore there is a collision here
743 // store out the impact information
744 if ((trace->hitsupercontentsmask & other_start->supercontents) && !(trace->skipsupercontentsmask & other_start->supercontents))
746 trace->hitsupercontents = other_start->supercontents;
747 trace->hitq3surfaceflags = hitq3surfaceflags;
748 trace->hittexture = hittexture;
749 trace->fraction = bound(0, enterfrac2, 1);
750 VectorCopy(newimpactplane, trace->plane.normal);
751 trace->plane.dist = newimpactplane[3];
756 // started inside, update startsolid and friends
757 trace->startsupercontents |= other_start->supercontents;
758 if ((trace->hitsupercontentsmask & other_start->supercontents) && !(trace->skipsupercontentsmask & other_start->supercontents))
760 trace->startsolid = true;
762 trace->allsolid = true;
763 VectorCopy(newimpactplane, trace->plane.normal);
764 trace->plane.dist = newimpactplane[3];
765 if (trace->startdepth > startdepth)
767 trace->startdepth = startdepth;
768 VectorCopy(startdepthnormal, trace->startdepthnormal);
774 // NOTE: start and end of each brush pair must have same numplanes/numpoints
775 void Collision_TraceLineBrushFloat(trace_t *trace, const vec3_t linestart, const vec3_t lineend, const colbrushf_t *other_start, const colbrushf_t *other_end)
777 int nplane, hitq3surfaceflags = 0;
778 int numplanes = other_start->numplanes;
779 vec_t enterfrac = -1, leavefrac = 1, startdist, enddist, ie, f, imove, enterfrac2 = -1;
782 vec4_t newimpactplane;
783 const texture_t *hittexture = NULL;
784 vec_t startdepth = 1;
785 vec3_t startdepthnormal;
787 if (collision_debug_tracelineasbox.integer)
789 colboxbrushf_t thisbrush_start, thisbrush_end;
790 Collision_BrushForBox(&thisbrush_start, linestart, linestart, 0, 0, NULL);
791 Collision_BrushForBox(&thisbrush_end, lineend, lineend, 0, 0, NULL);
792 Collision_TraceBrushBrushFloat(trace, &thisbrush_start.brush, &thisbrush_end.brush, other_start, other_end);
796 VectorClear(startdepthnormal);
797 Vector4Clear(newimpactplane);
799 // Separating Axis Theorem:
800 // if a supporting vector (plane normal) can be found that separates two
801 // objects, they are not colliding.
804 // reduce the size of one object to a point while enlarging the other to
805 // represent the space that point can not occupy.
807 // try every plane we can construct between the two brushes and measure
808 // the distance between them.
809 for (nplane = 0;nplane < numplanes;nplane++)
811 VectorCopy(other_start->planes[nplane].normal, startplane);
812 startplane[3] = other_start->planes[nplane].dist;
813 VectorCopy(other_end->planes[nplane].normal, endplane);
814 endplane[3] = other_end->planes[nplane].dist;
815 startdist = DotProduct(linestart, startplane) - startplane[3];
816 enddist = DotProduct(lineend, endplane) - endplane[3];
817 //Con_Printf("%c%i: startdist = %f, enddist = %f, startdist / (startdist - enddist) = %f\n", nplane2 != nplane ? 'b' : 'a', nplane2, startdist, enddist, startdist / (startdist - enddist));
819 // aside from collisions, this is also used for error correction
820 if (startdist <= 0.0f && (startdepth < startdist || startdepth == 1))
822 startdepth = startdist;
823 VectorCopy(startplane, startdepthnormal);
826 if (startdist > enddist)
834 imove = 1 / (startdist - enddist);
835 f = startdist * imove;
836 // check if this will reduce the collision time range
839 // reduced collision time range
841 // if the collision time range is now empty, no collision
842 if (enterfrac > leavefrac)
844 // calculate the nudged fraction and impact normal we'll
845 // need if we accept this collision later
846 enterfrac2 = (startdist - collision_impactnudge.value) * imove;
847 // if the collision would be further away than the trace's
848 // existing collision data, we don't care about this
850 if (enterfrac2 >= trace->fraction)
852 ie = 1.0f - enterfrac;
853 newimpactplane[0] = startplane[0] * ie + endplane[0] * enterfrac;
854 newimpactplane[1] = startplane[1] * ie + endplane[1] * enterfrac;
855 newimpactplane[2] = startplane[2] * ie + endplane[2] * enterfrac;
856 newimpactplane[3] = startplane[3] * ie + endplane[3] * enterfrac;
857 hitq3surfaceflags = other_start->planes[nplane].q3surfaceflags;
858 hittexture = other_start->planes[nplane].texture;
864 // moving out of brush
870 f = startdist / (startdist - enddist);
871 // check if this will reduce the collision time range
874 // reduced collision time range
876 // if the collision time range is now empty, no collision
877 if (enterfrac > leavefrac)
884 // at this point we know the trace overlaps the brush because it was not
885 // rejected at any point in the loop above
887 // see if the trace started outside the brush or not
890 // started outside, and overlaps, therefore there is a collision here
891 // store out the impact information
892 if ((trace->hitsupercontentsmask & other_start->supercontents) && !(trace->skipsupercontentsmask & other_start->supercontents))
894 trace->hitsupercontents = other_start->supercontents;
895 trace->hitq3surfaceflags = hitq3surfaceflags;
896 trace->hittexture = hittexture;
897 trace->fraction = bound(0, enterfrac2, 1);
898 VectorCopy(newimpactplane, trace->plane.normal);
899 trace->plane.dist = newimpactplane[3];
904 // started inside, update startsolid and friends
905 trace->startsupercontents |= other_start->supercontents;
906 if ((trace->hitsupercontentsmask & other_start->supercontents) && !(trace->skipsupercontentsmask & other_start->supercontents))
908 trace->startsolid = true;
910 trace->allsolid = true;
911 VectorCopy(newimpactplane, trace->plane.normal);
912 trace->plane.dist = newimpactplane[3];
913 if (trace->startdepth > startdepth)
915 trace->startdepth = startdepth;
916 VectorCopy(startdepthnormal, trace->startdepthnormal);
922 qboolean Collision_PointInsideBrushFloat(const vec3_t point, const colbrushf_t *brush)
925 const colplanef_t *plane;
927 if (!BoxesOverlap(point, point, brush->mins, brush->maxs))
929 for (nplane = 0, plane = brush->planes;nplane < brush->numplanes;nplane++, plane++)
930 if (DotProduct(plane->normal, point) > plane->dist)
935 void Collision_TracePointBrushFloat(trace_t *trace, const vec3_t point, const colbrushf_t *thatbrush)
937 if (!Collision_PointInsideBrushFloat(point, thatbrush))
940 trace->startsupercontents |= thatbrush->supercontents;
941 if ((trace->hitsupercontentsmask & thatbrush->supercontents) && !(trace->skipsupercontentsmask & thatbrush->supercontents))
943 trace->startsolid = true;
944 trace->allsolid = true;
948 static void Collision_SnapCopyPoints(int numpoints, const colpointf_t *in, colpointf_t *out, float fractionprecision, float invfractionprecision)
951 for (i = 0;i < numpoints;i++)
953 out[i].v[0] = floor(in[i].v[0] * fractionprecision + 0.5f) * invfractionprecision;
954 out[i].v[1] = floor(in[i].v[1] * fractionprecision + 0.5f) * invfractionprecision;
955 out[i].v[2] = floor(in[i].v[2] * fractionprecision + 0.5f) * invfractionprecision;
959 void Collision_TraceBrushTriangleMeshFloat(trace_t *trace, const colbrushf_t *thisbrush_start, const colbrushf_t *thisbrush_end, int numtriangles, const int *element3i, const float *vertex3f, int stride, float *bbox6f, int supercontents, int q3surfaceflags, const texture_t *texture, const vec3_t segmentmins, const vec3_t segmentmaxs)
962 colpointf_t points[3];
963 colpointf_t edgedirs[3];
964 colplanef_t planes[5];
966 memset(&brush, 0, sizeof(brush));
967 brush.isaabb = false;
968 brush.hasaabbplanes = false;
970 brush.numedgedirs = 3;
972 brush.points = points;
973 brush.edgedirs = edgedirs;
974 brush.planes = planes;
975 brush.supercontents = supercontents;
976 brush.q3surfaceflags = q3surfaceflags;
977 brush.texture = texture;
978 for (i = 0;i < brush.numplanes;i++)
980 brush.planes[i].q3surfaceflags = q3surfaceflags;
981 brush.planes[i].texture = texture;
986 cnt = (numtriangles + stride - 1) / stride;
987 for(i = 0; i < cnt; ++i)
989 if(BoxesOverlap(bbox6f + i * 6, bbox6f + i * 6 + 3, segmentmins, segmentmaxs))
991 for(k = 0; k < stride; ++k)
993 tri = i * stride + k;
994 if(tri >= numtriangles)
996 VectorCopy(vertex3f + element3i[tri * 3 + 0] * 3, points[0].v);
997 VectorCopy(vertex3f + element3i[tri * 3 + 1] * 3, points[1].v);
998 VectorCopy(vertex3f + element3i[tri * 3 + 2] * 3, points[2].v);
999 Collision_SnapCopyPoints(brush.numpoints, points, points, COLLISION_SNAPSCALE, COLLISION_SNAP);
1000 Collision_CalcEdgeDirsForPolygonBrushFloat(&brush);
1001 Collision_CalcPlanesForTriangleBrushFloat(&brush);
1002 //Collision_PrintBrushAsQHull(&brush, "brush");
1003 Collision_TraceBrushBrushFloat(trace, thisbrush_start, thisbrush_end, &brush, &brush);
1008 else if(stride == 0)
1010 for (i = 0;i < numtriangles;i++, element3i += 3)
1012 if (TriangleBBoxOverlapsBox(vertex3f + element3i[0]*3, vertex3f + element3i[1]*3, vertex3f + element3i[2]*3, segmentmins, segmentmaxs))
1014 VectorCopy(vertex3f + element3i[0] * 3, points[0].v);
1015 VectorCopy(vertex3f + element3i[1] * 3, points[1].v);
1016 VectorCopy(vertex3f + element3i[2] * 3, points[2].v);
1017 Collision_SnapCopyPoints(brush.numpoints, points, points, COLLISION_SNAPSCALE, COLLISION_SNAP);
1018 Collision_CalcEdgeDirsForPolygonBrushFloat(&brush);
1019 Collision_CalcPlanesForTriangleBrushFloat(&brush);
1020 //Collision_PrintBrushAsQHull(&brush, "brush");
1021 Collision_TraceBrushBrushFloat(trace, thisbrush_start, thisbrush_end, &brush, &brush);
1027 for (i = 0;i < numtriangles;i++, element3i += 3)
1029 VectorCopy(vertex3f + element3i[0] * 3, points[0].v);
1030 VectorCopy(vertex3f + element3i[1] * 3, points[1].v);
1031 VectorCopy(vertex3f + element3i[2] * 3, points[2].v);
1032 Collision_SnapCopyPoints(brush.numpoints, points, points, COLLISION_SNAPSCALE, COLLISION_SNAP);
1033 Collision_CalcEdgeDirsForPolygonBrushFloat(&brush);
1034 Collision_CalcPlanesForTriangleBrushFloat(&brush);
1035 //Collision_PrintBrushAsQHull(&brush, "brush");
1036 Collision_TraceBrushBrushFloat(trace, thisbrush_start, thisbrush_end, &brush, &brush);
1041 void Collision_TraceLineTriangleMeshFloat(trace_t *trace, const vec3_t linestart, const vec3_t lineend, int numtriangles, const int *element3i, const float *vertex3f, int stride, float *bbox6f, int supercontents, int q3surfaceflags, const texture_t *texture, const vec3_t segmentmins, const vec3_t segmentmaxs)
1044 // FIXME: snap vertices?
1048 cnt = (numtriangles + stride - 1) / stride;
1049 for(i = 0; i < cnt; ++i)
1051 if(BoxesOverlap(bbox6f + i * 6, bbox6f + i * 6 + 3, segmentmins, segmentmaxs))
1053 for(k = 0; k < stride; ++k)
1055 tri = i * stride + k;
1056 if(tri >= numtriangles)
1058 Collision_TraceLineTriangleFloat(trace, linestart, lineend, vertex3f + element3i[tri * 3 + 0] * 3, vertex3f + element3i[tri * 3 + 1] * 3, vertex3f + element3i[tri * 3 + 2] * 3, supercontents, q3surfaceflags, texture);
1065 for (i = 0;i < numtriangles;i++, element3i += 3)
1066 Collision_TraceLineTriangleFloat(trace, linestart, lineend, vertex3f + element3i[0] * 3, vertex3f + element3i[1] * 3, vertex3f + element3i[2] * 3, supercontents, q3surfaceflags, texture);
1070 void Collision_TraceBrushTriangleFloat(trace_t *trace, const colbrushf_t *thisbrush_start, const colbrushf_t *thisbrush_end, const float *v0, const float *v1, const float *v2, int supercontents, int q3surfaceflags, const texture_t *texture)
1073 colpointf_t points[3];
1074 colpointf_t edgedirs[3];
1075 colplanef_t planes[5];
1077 memset(&brush, 0, sizeof(brush));
1078 brush.isaabb = false;
1079 brush.hasaabbplanes = false;
1080 brush.numpoints = 3;
1081 brush.numedgedirs = 3;
1082 brush.numplanes = 5;
1083 brush.points = points;
1084 brush.edgedirs = edgedirs;
1085 brush.planes = planes;
1086 brush.supercontents = supercontents;
1087 brush.q3surfaceflags = q3surfaceflags;
1088 brush.texture = texture;
1089 for (i = 0;i < brush.numplanes;i++)
1091 brush.planes[i].q3surfaceflags = q3surfaceflags;
1092 brush.planes[i].texture = texture;
1094 VectorCopy(v0, points[0].v);
1095 VectorCopy(v1, points[1].v);
1096 VectorCopy(v2, points[2].v);
1097 Collision_SnapCopyPoints(brush.numpoints, points, points, COLLISION_SNAPSCALE, COLLISION_SNAP);
1098 Collision_CalcEdgeDirsForPolygonBrushFloat(&brush);
1099 Collision_CalcPlanesForTriangleBrushFloat(&brush);
1100 //Collision_PrintBrushAsQHull(&brush, "brush");
1101 Collision_TraceBrushBrushFloat(trace, thisbrush_start, thisbrush_end, &brush, &brush);
1104 void Collision_BrushForBox(colboxbrushf_t *boxbrush, const vec3_t mins, const vec3_t maxs, int supercontents, int q3surfaceflags, const texture_t *texture)
1107 memset(boxbrush, 0, sizeof(*boxbrush));
1108 boxbrush->brush.isaabb = true;
1109 boxbrush->brush.hasaabbplanes = true;
1110 boxbrush->brush.points = boxbrush->points;
1111 boxbrush->brush.edgedirs = boxbrush->edgedirs;
1112 boxbrush->brush.planes = boxbrush->planes;
1113 boxbrush->brush.supercontents = supercontents;
1114 boxbrush->brush.q3surfaceflags = q3surfaceflags;
1115 boxbrush->brush.texture = texture;
1116 if (VectorCompare(mins, maxs))
1119 boxbrush->brush.numpoints = 1;
1120 boxbrush->brush.numedgedirs = 0;
1121 boxbrush->brush.numplanes = 0;
1122 VectorCopy(mins, boxbrush->brush.points[0].v);
1126 boxbrush->brush.numpoints = 8;
1127 boxbrush->brush.numedgedirs = 3;
1128 boxbrush->brush.numplanes = 6;
1129 // there are 8 points on a box
1130 // there are 3 edgedirs on a box (both signs are tested in collision)
1131 // there are 6 planes on a box
1132 VectorSet(boxbrush->brush.points[0].v, mins[0], mins[1], mins[2]);
1133 VectorSet(boxbrush->brush.points[1].v, maxs[0], mins[1], mins[2]);
1134 VectorSet(boxbrush->brush.points[2].v, mins[0], maxs[1], mins[2]);
1135 VectorSet(boxbrush->brush.points[3].v, maxs[0], maxs[1], mins[2]);
1136 VectorSet(boxbrush->brush.points[4].v, mins[0], mins[1], maxs[2]);
1137 VectorSet(boxbrush->brush.points[5].v, maxs[0], mins[1], maxs[2]);
1138 VectorSet(boxbrush->brush.points[6].v, mins[0], maxs[1], maxs[2]);
1139 VectorSet(boxbrush->brush.points[7].v, maxs[0], maxs[1], maxs[2]);
1140 VectorSet(boxbrush->brush.edgedirs[0].v, 1, 0, 0);
1141 VectorSet(boxbrush->brush.edgedirs[1].v, 0, 1, 0);
1142 VectorSet(boxbrush->brush.edgedirs[2].v, 0, 0, 1);
1143 VectorSet(boxbrush->brush.planes[0].normal, -1, 0, 0);boxbrush->brush.planes[0].dist = -mins[0];
1144 VectorSet(boxbrush->brush.planes[1].normal, 1, 0, 0);boxbrush->brush.planes[1].dist = maxs[0];
1145 VectorSet(boxbrush->brush.planes[2].normal, 0, -1, 0);boxbrush->brush.planes[2].dist = -mins[1];
1146 VectorSet(boxbrush->brush.planes[3].normal, 0, 1, 0);boxbrush->brush.planes[3].dist = maxs[1];
1147 VectorSet(boxbrush->brush.planes[4].normal, 0, 0, -1);boxbrush->brush.planes[4].dist = -mins[2];
1148 VectorSet(boxbrush->brush.planes[5].normal, 0, 0, 1);boxbrush->brush.planes[5].dist = maxs[2];
1149 for (i = 0;i < 6;i++)
1151 boxbrush->brush.planes[i].q3surfaceflags = q3surfaceflags;
1152 boxbrush->brush.planes[i].texture = texture;
1155 boxbrush->brush.supercontents = supercontents;
1156 boxbrush->brush.q3surfaceflags = q3surfaceflags;
1157 boxbrush->brush.texture = texture;
1158 VectorSet(boxbrush->brush.mins, mins[0] - 1, mins[1] - 1, mins[2] - 1);
1159 VectorSet(boxbrush->brush.maxs, maxs[0] + 1, maxs[1] + 1, maxs[2] + 1);
1160 //Collision_ValidateBrush(&boxbrush->brush);
1163 //pseudocode for detecting line/sphere overlap without calculating an impact point
1164 //linesphereorigin = sphereorigin - linestart;linediff = lineend - linestart;linespherefrac = DotProduct(linesphereorigin, linediff) / DotProduct(linediff, linediff);return VectorLength2(linesphereorigin - bound(0, linespherefrac, 1) * linediff) >= sphereradius*sphereradius;
1166 // LordHavoc: currently unused, but tested
1167 // note: this can be used for tracing a moving sphere vs a stationary sphere,
1168 // by simply adding the moving sphere's radius to the sphereradius parameter,
1169 // all the results are correct (impactpoint, impactnormal, and fraction)
1170 float Collision_ClipTrace_Line_Sphere(double *linestart, double *lineend, double *sphereorigin, double sphereradius, double *impactpoint, double *impactnormal)
1172 double dir[3], scale, v[3], deviationdist2, impactdist, linelength;
1173 // make sure the impactpoint and impactnormal are valid even if there is
1175 VectorCopy(lineend, impactpoint);
1176 VectorClear(impactnormal);
1177 // calculate line direction
1178 VectorSubtract(lineend, linestart, dir);
1179 // normalize direction
1180 linelength = VectorLength(dir);
1183 scale = 1.0 / linelength;
1184 VectorScale(dir, scale, dir);
1186 // this dotproduct calculates the distance along the line at which the
1187 // sphere origin is (nearest point to the sphere origin on the line)
1188 impactdist = DotProduct(sphereorigin, dir) - DotProduct(linestart, dir);
1189 // calculate point on line at that distance, and subtract the
1190 // sphereorigin from it, so we have a vector to measure for the distance
1191 // of the line from the sphereorigin (deviation, how off-center it is)
1192 VectorMA(linestart, impactdist, dir, v);
1193 VectorSubtract(v, sphereorigin, v);
1194 deviationdist2 = sphereradius * sphereradius - VectorLength2(v);
1195 // if squared offset length is outside the squared sphere radius, miss
1196 if (deviationdist2 < 0)
1197 return 1; // miss (off to the side)
1198 // nudge back to find the correct impact distance
1199 impactdist -= sqrt(deviationdist2);
1200 if (impactdist >= linelength)
1201 return 1; // miss (not close enough)
1203 return 1; // miss (linestart is past or inside sphere)
1204 // calculate new impactpoint
1205 VectorMA(linestart, impactdist, dir, impactpoint);
1206 // calculate impactnormal (surface normal at point of impact)
1207 VectorSubtract(impactpoint, sphereorigin, impactnormal);
1208 // normalize impactnormal
1209 VectorNormalize(impactnormal);
1210 // return fraction of movement distance
1211 return impactdist / linelength;
1214 void Collision_TraceLineTriangleFloat(trace_t *trace, const vec3_t linestart, const vec3_t lineend, const float *point0, const float *point1, const float *point2, int supercontents, int q3surfaceflags, const texture_t *texture)
1216 float d1, d2, d, f, f2, impact[3], edgenormal[3], faceplanenormal[3], faceplanedist, faceplanenormallength2, edge01[3], edge21[3], edge02[3];
1218 // this function executes:
1219 // 32 ops when line starts behind triangle
1220 // 38 ops when line ends infront of triangle
1221 // 43 ops when line fraction is already closer than this triangle
1222 // 72 ops when line is outside edge 01
1223 // 92 ops when line is outside edge 21
1224 // 115 ops when line is outside edge 02
1225 // 123 ops when line impacts triangle and updates trace results
1227 // this code is designed for clockwise triangles, conversion to
1228 // counterclockwise would require swapping some things around...
1229 // it is easier to simply swap the point0 and point2 parameters to this
1230 // function when calling it than it is to rewire the internals.
1232 // calculate the faceplanenormal of the triangle, this represents the front side
1234 VectorSubtract(point0, point1, edge01);
1235 VectorSubtract(point2, point1, edge21);
1236 CrossProduct(edge01, edge21, faceplanenormal);
1237 // there's no point in processing a degenerate triangle (GIGO - Garbage In, Garbage Out)
1239 faceplanenormallength2 = DotProduct(faceplanenormal, faceplanenormal);
1240 if (faceplanenormallength2 < 0.0001f)
1242 // calculate the distance
1244 faceplanedist = DotProduct(point0, faceplanenormal);
1246 // if start point is on the back side there is no collision
1247 // (we don't care about traces going through the triangle the wrong way)
1249 // calculate the start distance
1251 d1 = DotProduct(faceplanenormal, linestart);
1252 if (d1 <= faceplanedist)
1255 // calculate the end distance
1257 d2 = DotProduct(faceplanenormal, lineend);
1258 // if both are in front, there is no collision
1259 if (d2 >= faceplanedist)
1262 // from here on we know d1 is >= 0 and d2 is < 0
1263 // this means the line starts infront and ends behind, passing through it
1265 // calculate the recipricol of the distance delta,
1266 // so we can use it multiple times cheaply (instead of division)
1268 d = 1.0f / (d1 - d2);
1269 // calculate the impact fraction by taking the start distance (> 0)
1270 // and subtracting the face plane distance (this is the distance of the
1271 // triangle along that same normal)
1272 // then multiply by the recipricol distance delta
1274 f = (d1 - faceplanedist) * d;
1275 f2 = f - collision_impactnudge.value * d;
1276 // skip out if this impact is further away than previous ones
1278 if (f2 >= trace->fraction)
1280 // calculate the perfect impact point for classification of insidedness
1282 impact[0] = linestart[0] + f * (lineend[0] - linestart[0]);
1283 impact[1] = linestart[1] + f * (lineend[1] - linestart[1]);
1284 impact[2] = linestart[2] + f * (lineend[2] - linestart[2]);
1286 // calculate the edge normal and reject if impact is outside triangle
1287 // (an edge normal faces away from the triangle, to get the desired normal
1288 // a crossproduct with the faceplanenormal is used, and because of the way
1289 // the insidedness comparison is written it does not need to be normalized)
1291 // first use the two edges from the triangle plane math
1292 // the other edge only gets calculated if the point survives that long
1295 CrossProduct(edge01, faceplanenormal, edgenormal);
1296 if (DotProduct(impact, edgenormal) > DotProduct(point1, edgenormal))
1300 CrossProduct(faceplanenormal, edge21, edgenormal);
1301 if (DotProduct(impact, edgenormal) > DotProduct(point2, edgenormal))
1305 VectorSubtract(point0, point2, edge02);
1306 CrossProduct(faceplanenormal, edge02, edgenormal);
1307 if (DotProduct(impact, edgenormal) > DotProduct(point0, edgenormal))
1312 // skip if this trace should not be blocked by these contents
1313 if (!(supercontents & trace->hitsupercontentsmask) || (supercontents & trace->skipsupercontentsmask))
1316 // store the new trace fraction
1317 trace->fraction = f2;
1319 // store the new trace plane (because collisions only happen from
1320 // the front this is always simply the triangle normal, never flipped)
1321 d = 1.0 / sqrt(faceplanenormallength2);
1322 VectorScale(faceplanenormal, d, trace->plane.normal);
1323 trace->plane.dist = faceplanedist * d;
1325 trace->hitsupercontents = supercontents;
1326 trace->hitq3surfaceflags = q3surfaceflags;
1327 trace->hittexture = texture;
1330 void Collision_BoundingBoxOfBrushTraceSegment(const colbrushf_t *start, const colbrushf_t *end, vec3_t mins, vec3_t maxs, float startfrac, float endfrac)
1333 colpointf_t *ps, *pe;
1334 float tempstart[3], tempend[3];
1335 VectorLerp(start->points[0].v, startfrac, end->points[0].v, mins);
1336 VectorCopy(mins, maxs);
1337 for (i = 0, ps = start->points, pe = end->points;i < start->numpoints;i++, ps++, pe++)
1339 VectorLerp(ps->v, startfrac, pe->v, tempstart);
1340 VectorLerp(ps->v, endfrac, pe->v, tempend);
1341 mins[0] = min(mins[0], min(tempstart[0], tempend[0]));
1342 mins[1] = min(mins[1], min(tempstart[1], tempend[1]));
1343 mins[2] = min(mins[2], min(tempstart[2], tempend[2]));
1344 maxs[0] = min(maxs[0], min(tempstart[0], tempend[0]));
1345 maxs[1] = min(maxs[1], min(tempstart[1], tempend[1]));
1346 maxs[2] = min(maxs[2], min(tempstart[2], tempend[2]));
1356 //===========================================
1358 static void Collision_TranslateBrush(const vec3_t shift, colbrushf_t *brush)
1361 // now we can transform the data
1362 for(i = 0; i < brush->numplanes; ++i)
1364 brush->planes[i].dist += DotProduct(shift, brush->planes[i].normal);
1366 for(i = 0; i < brush->numpoints; ++i)
1368 VectorAdd(brush->points[i].v, shift, brush->points[i].v);
1370 VectorAdd(brush->mins, shift, brush->mins);
1371 VectorAdd(brush->maxs, shift, brush->maxs);
1374 static void Collision_TransformBrush(const matrix4x4_t *matrix, colbrushf_t *brush)
1378 // we're breaking any AABB properties here...
1379 brush->isaabb = false;
1380 brush->hasaabbplanes = false;
1381 // now we can transform the data
1382 for(i = 0; i < brush->numplanes; ++i)
1384 Matrix4x4_TransformPositivePlane(matrix, brush->planes[i].normal[0], brush->planes[i].normal[1], brush->planes[i].normal[2], brush->planes[i].dist, brush->planes[i].normal_and_dist);
1386 for(i = 0; i < brush->numedgedirs; ++i)
1388 Matrix4x4_Transform(matrix, brush->edgedirs[i].v, v);
1389 VectorCopy(v, brush->edgedirs[i].v);
1391 for(i = 0; i < brush->numpoints; ++i)
1393 Matrix4x4_Transform(matrix, brush->points[i].v, v);
1394 VectorCopy(v, brush->points[i].v);
1396 VectorCopy(brush->points[0].v, brush->mins);
1397 VectorCopy(brush->points[0].v, brush->maxs);
1398 for(i = 1; i < brush->numpoints; ++i)
1400 if(brush->points[i].v[0] < brush->mins[0]) brush->mins[0] = brush->points[i].v[0];
1401 if(brush->points[i].v[1] < brush->mins[1]) brush->mins[1] = brush->points[i].v[1];
1402 if(brush->points[i].v[2] < brush->mins[2]) brush->mins[2] = brush->points[i].v[2];
1403 if(brush->points[i].v[0] > brush->maxs[0]) brush->maxs[0] = brush->points[i].v[0];
1404 if(brush->points[i].v[1] > brush->maxs[1]) brush->maxs[1] = brush->points[i].v[1];
1405 if(brush->points[i].v[2] > brush->maxs[2]) brush->maxs[2] = brush->points[i].v[2];
1409 typedef struct collision_cachedtrace_parameters_s
1414 int hitsupercontentsmask;
1415 int skipsupercontentsmask;
1418 collision_cachedtrace_parameters_t;
1420 typedef struct collision_cachedtrace_s
1423 collision_cachedtrace_parameters_t p;
1426 collision_cachedtrace_t;
1428 static mempool_t *collision_cachedtrace_mempool;
1429 static collision_cachedtrace_t *collision_cachedtrace_array;
1430 static int collision_cachedtrace_firstfree;
1431 static int collision_cachedtrace_lastused;
1432 static int collision_cachedtrace_max;
1433 static unsigned char collision_cachedtrace_sequence;
1434 static int collision_cachedtrace_hashsize;
1435 static int *collision_cachedtrace_hash;
1436 static unsigned int *collision_cachedtrace_arrayfullhashindex;
1437 static unsigned int *collision_cachedtrace_arrayhashindex;
1438 static unsigned int *collision_cachedtrace_arraynext;
1439 static unsigned char *collision_cachedtrace_arrayused;
1440 static qboolean collision_cachedtrace_rebuildhash;
1442 void Collision_Cache_Reset(qboolean resetlimits)
1444 if (collision_cachedtrace_hash)
1445 Mem_Free(collision_cachedtrace_hash);
1446 if (collision_cachedtrace_array)
1447 Mem_Free(collision_cachedtrace_array);
1448 if (collision_cachedtrace_arrayfullhashindex)
1449 Mem_Free(collision_cachedtrace_arrayfullhashindex);
1450 if (collision_cachedtrace_arrayhashindex)
1451 Mem_Free(collision_cachedtrace_arrayhashindex);
1452 if (collision_cachedtrace_arraynext)
1453 Mem_Free(collision_cachedtrace_arraynext);
1454 if (collision_cachedtrace_arrayused)
1455 Mem_Free(collision_cachedtrace_arrayused);
1456 if (resetlimits || !collision_cachedtrace_max)
1457 collision_cachedtrace_max = collision_cache.integer ? 128 : 1;
1458 collision_cachedtrace_firstfree = 1;
1459 collision_cachedtrace_lastused = 0;
1460 collision_cachedtrace_hashsize = collision_cachedtrace_max;
1461 collision_cachedtrace_array = (collision_cachedtrace_t *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_max * sizeof(collision_cachedtrace_t));
1462 collision_cachedtrace_hash = (int *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_hashsize * sizeof(int));
1463 collision_cachedtrace_arrayfullhashindex = (unsigned int *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_max * sizeof(unsigned int));
1464 collision_cachedtrace_arrayhashindex = (unsigned int *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_max * sizeof(unsigned int));
1465 collision_cachedtrace_arraynext = (unsigned int *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_max * sizeof(unsigned int));
1466 collision_cachedtrace_arrayused = (unsigned char *)Mem_Alloc(collision_cachedtrace_mempool, collision_cachedtrace_max * sizeof(unsigned char));
1467 collision_cachedtrace_sequence = 1;
1468 collision_cachedtrace_rebuildhash = false;
1471 void Collision_Cache_Init(mempool_t *mempool)
1473 collision_cachedtrace_mempool = mempool;
1474 Collision_Cache_Reset(true);
1477 static void Collision_Cache_RebuildHash(void)
1480 int range = collision_cachedtrace_lastused + 1;
1481 unsigned char sequence = collision_cachedtrace_sequence;
1482 int firstfree = collision_cachedtrace_max;
1484 int *hash = collision_cachedtrace_hash;
1485 unsigned int hashindex;
1486 unsigned int *arrayhashindex = collision_cachedtrace_arrayhashindex;
1487 unsigned int *arraynext = collision_cachedtrace_arraynext;
1488 collision_cachedtrace_rebuildhash = false;
1489 memset(collision_cachedtrace_hash, 0, collision_cachedtrace_hashsize * sizeof(int));
1490 for (index = 1;index < range;index++)
1492 if (collision_cachedtrace_arrayused[index] == sequence)
1494 hashindex = arrayhashindex[index];
1495 arraynext[index] = hash[hashindex];
1496 hash[hashindex] = index;
1501 if (firstfree > index)
1503 collision_cachedtrace_arrayused[index] = 0;
1506 collision_cachedtrace_firstfree = firstfree;
1507 collision_cachedtrace_lastused = lastused;
1510 void Collision_Cache_NewFrame(void)
1512 if (collision_cache.integer)
1514 if (collision_cachedtrace_max < 128)
1515 Collision_Cache_Reset(true);
1519 if (collision_cachedtrace_max > 1)
1520 Collision_Cache_Reset(true);
1522 // rebuild hash if sequence would overflow byte, otherwise increment
1523 if (collision_cachedtrace_sequence == 255)
1525 Collision_Cache_RebuildHash();
1526 collision_cachedtrace_sequence = 1;
1530 collision_cachedtrace_rebuildhash = true;
1531 collision_cachedtrace_sequence++;
1535 static unsigned int Collision_Cache_HashIndexForArray(unsigned int *array, unsigned int size)
1538 unsigned int hashindex = 0;
1539 // this is a super-cheesy checksum, designed only for speed
1540 for (i = 0;i < size;i++)
1541 hashindex += array[i] * (1 + i);
1545 static collision_cachedtrace_t *Collision_Cache_Lookup(dp_model_t *model, const matrix4x4_t *matrix, const matrix4x4_t *inversematrix, const vec3_t start, const vec3_t end, int hitsupercontentsmask, int skipsupercontentsmask)
1548 unsigned int fullhashindex;
1551 unsigned char sequence = collision_cachedtrace_sequence;
1552 int *hash = collision_cachedtrace_hash;
1553 unsigned int *arrayfullhashindex = collision_cachedtrace_arrayfullhashindex;
1554 unsigned int *arraynext = collision_cachedtrace_arraynext;
1555 collision_cachedtrace_t *cached = collision_cachedtrace_array + index;
1556 collision_cachedtrace_parameters_t params;
1557 // all non-cached traces use the same index
1558 if (!collision_cache.integer)
1559 r_refdef.stats[r_stat_photoncache_traced]++;
1562 // cached trace lookup
1563 memset(¶ms, 0, sizeof(params));
1564 params.model = model;
1565 VectorCopy(start, params.start);
1566 VectorCopy(end, params.end);
1567 params.hitsupercontentsmask = hitsupercontentsmask;
1568 params.skipsupercontentsmask = skipsupercontentsmask;
1569 params.matrix = *matrix;
1570 fullhashindex = Collision_Cache_HashIndexForArray((unsigned int *)¶ms, sizeof(params) / sizeof(unsigned int));
1571 hashindex = (int)(fullhashindex % (unsigned int)collision_cachedtrace_hashsize);
1572 for (index = hash[hashindex];index;index = arraynext[index])
1574 if (arrayfullhashindex[index] != fullhashindex)
1576 cached = collision_cachedtrace_array + index;
1577 //if (memcmp(&cached->p, ¶ms, sizeof(params)))
1578 if (cached->p.model != params.model
1579 || cached->p.end[0] != params.end[0]
1580 || cached->p.end[1] != params.end[1]
1581 || cached->p.end[2] != params.end[2]
1582 || cached->p.start[0] != params.start[0]
1583 || cached->p.start[1] != params.start[1]
1584 || cached->p.start[2] != params.start[2]
1585 || cached->p.hitsupercontentsmask != params.hitsupercontentsmask
1586 || cached->p.skipsupercontentsmask != params.skipsupercontentsmask
1587 || cached->p.matrix.m[0][0] != params.matrix.m[0][0]
1588 || cached->p.matrix.m[0][1] != params.matrix.m[0][1]
1589 || cached->p.matrix.m[0][2] != params.matrix.m[0][2]
1590 || cached->p.matrix.m[0][3] != params.matrix.m[0][3]
1591 || cached->p.matrix.m[1][0] != params.matrix.m[1][0]
1592 || cached->p.matrix.m[1][1] != params.matrix.m[1][1]
1593 || cached->p.matrix.m[1][2] != params.matrix.m[1][2]
1594 || cached->p.matrix.m[1][3] != params.matrix.m[1][3]
1595 || cached->p.matrix.m[2][0] != params.matrix.m[2][0]
1596 || cached->p.matrix.m[2][1] != params.matrix.m[2][1]
1597 || cached->p.matrix.m[2][2] != params.matrix.m[2][2]
1598 || cached->p.matrix.m[2][3] != params.matrix.m[2][3]
1599 || cached->p.matrix.m[3][0] != params.matrix.m[3][0]
1600 || cached->p.matrix.m[3][1] != params.matrix.m[3][1]
1601 || cached->p.matrix.m[3][2] != params.matrix.m[3][2]
1602 || cached->p.matrix.m[3][3] != params.matrix.m[3][3]
1605 // found a matching trace in the cache
1606 r_refdef.stats[r_stat_photoncache_cached]++;
1607 cached->valid = true;
1608 collision_cachedtrace_arrayused[index] = collision_cachedtrace_sequence;
1611 r_refdef.stats[r_stat_photoncache_traced]++;
1612 // find an unused cache entry
1613 for (index = collision_cachedtrace_firstfree, range = collision_cachedtrace_max;index < range;index++)
1614 if (collision_cachedtrace_arrayused[index] == 0)
1618 // all claimed, but probably some are stale...
1619 for (index = 1, range = collision_cachedtrace_max;index < range;index++)
1620 if (collision_cachedtrace_arrayused[index] != sequence)
1624 // found a stale one, rebuild the hash
1625 Collision_Cache_RebuildHash();
1629 // we need to grow the cache
1630 collision_cachedtrace_max *= 2;
1631 Collision_Cache_Reset(false);
1635 // link the new cache entry into the hash bucket
1636 collision_cachedtrace_firstfree = index + 1;
1637 if (collision_cachedtrace_lastused < index)
1638 collision_cachedtrace_lastused = index;
1639 cached = collision_cachedtrace_array + index;
1640 collision_cachedtrace_arraynext[index] = collision_cachedtrace_hash[hashindex];
1641 collision_cachedtrace_hash[hashindex] = index;
1642 collision_cachedtrace_arrayhashindex[index] = hashindex;
1643 cached->valid = false;
1645 collision_cachedtrace_arrayfullhashindex[index] = fullhashindex;
1646 collision_cachedtrace_arrayused[index] = collision_cachedtrace_sequence;
1651 void Collision_Cache_ClipLineToGenericEntitySurfaces(trace_t *trace, dp_model_t *model, matrix4x4_t *matrix, matrix4x4_t *inversematrix, const vec3_t start, const vec3_t end, int hitsupercontentsmask, int skipsupercontentsmask)
1653 collision_cachedtrace_t *cached = Collision_Cache_Lookup(model, matrix, inversematrix, start, end, hitsupercontentsmask, skipsupercontentsmask);
1656 *trace = cached->result;
1660 Collision_ClipLineToGenericEntity(trace, model, NULL, NULL, vec3_origin, vec3_origin, 0, matrix, inversematrix, start, end, hitsupercontentsmask, skipsupercontentsmask, collision_extendmovelength.value, true);
1662 cached->result = *trace;
1665 void Collision_Cache_ClipLineToWorldSurfaces(trace_t *trace, dp_model_t *model, const vec3_t start, const vec3_t end, int hitsupercontentsmask, int skipsupercontentsmask)
1667 collision_cachedtrace_t *cached = Collision_Cache_Lookup(model, &identitymatrix, &identitymatrix, start, end, hitsupercontentsmask, skipsupercontentsmask);
1670 *trace = cached->result;
1674 Collision_ClipLineToWorld(trace, model, start, end, hitsupercontentsmask, skipsupercontentsmask, collision_extendmovelength.value, true);
1676 cached->result = *trace;
1679 typedef struct extendtraceinfo_s
1685 float extendstart[3];
1687 float extenddelta[3];
1690 float scaletoextend;
1695 static void Collision_ClipExtendPrepare(extendtraceinfo_t *extendtraceinfo, trace_t *trace, const vec3_t tstart, const vec3_t tend, float textend)
1697 memset(trace, 0, sizeof(*trace));
1698 trace->fraction = 1;
1700 extendtraceinfo->trace = trace;
1701 VectorCopy(tstart, extendtraceinfo->realstart);
1702 VectorCopy(tend, extendtraceinfo->realend);
1703 VectorSubtract(extendtraceinfo->realend, extendtraceinfo->realstart, extendtraceinfo->realdelta);
1704 VectorCopy(extendtraceinfo->realstart, extendtraceinfo->extendstart);
1705 VectorCopy(extendtraceinfo->realend, extendtraceinfo->extendend);
1706 VectorCopy(extendtraceinfo->realdelta, extendtraceinfo->extenddelta);
1707 extendtraceinfo->reallength = VectorLength(extendtraceinfo->realdelta);
1708 extendtraceinfo->extendlength = extendtraceinfo->reallength;
1709 extendtraceinfo->scaletoextend = 1.0f;
1710 extendtraceinfo->extend = textend;
1712 // make the trace longer according to the extend parameter
1713 if (extendtraceinfo->reallength && extendtraceinfo->extend)
1715 extendtraceinfo->extendlength = extendtraceinfo->reallength + extendtraceinfo->extend;
1716 extendtraceinfo->scaletoextend = extendtraceinfo->extendlength / extendtraceinfo->reallength;
1717 VectorMA(extendtraceinfo->realstart, extendtraceinfo->scaletoextend, extendtraceinfo->realdelta, extendtraceinfo->extendend);
1718 VectorSubtract(extendtraceinfo->extendend, extendtraceinfo->extendstart, extendtraceinfo->extenddelta);
1722 static void Collision_ClipExtendFinish(extendtraceinfo_t *extendtraceinfo)
1724 trace_t *trace = extendtraceinfo->trace;
1726 if (trace->fraction != 1.0f)
1728 // undo the extended trace length
1729 trace->fraction *= extendtraceinfo->scaletoextend;
1731 // if the extended trace hit something that the unextended trace did not hit (even considering the collision_impactnudge), then we have to clear the hit information
1732 if (trace->fraction > 1.0f)
1734 // note that ent may refer to either startsolid or fraction<1, we can't restore the startsolid ent unfortunately
1736 trace->hitq3surfaceflags = 0;
1737 trace->hitsupercontents = 0;
1738 trace->hittexture = NULL;
1739 VectorClear(trace->plane.normal);
1740 trace->plane.dist = 0.0f;
1745 trace->fraction = bound(0, trace->fraction, 1);
1747 // calculate the end position
1748 VectorMA(extendtraceinfo->realstart, trace->fraction, extendtraceinfo->realdelta, trace->endpos);
1751 void Collision_ClipToGenericEntity(trace_t *trace, dp_model_t *model, const frameblend_t *frameblend, const skeleton_t *skeleton, const vec3_t bodymins, const vec3_t bodymaxs, int bodysupercontents, matrix4x4_t *matrix, matrix4x4_t *inversematrix, const vec3_t tstart, const vec3_t mins, const vec3_t maxs, const vec3_t tend, int hitsupercontentsmask, int skipsupercontentsmask, float extend)
1753 vec3_t starttransformed, endtransformed;
1754 extendtraceinfo_t extendtraceinfo;
1755 Collision_ClipExtendPrepare(&extendtraceinfo, trace, tstart, tend, extend);
1757 Matrix4x4_Transform(inversematrix, extendtraceinfo.extendstart, starttransformed);
1758 Matrix4x4_Transform(inversematrix, extendtraceinfo.extendend, endtransformed);
1759 #if COLLISIONPARANOID >= 3
1760 Con_Printf("trans(%f %f %f -> %f %f %f, %f %f %f -> %f %f %f)", extendtraceinfo.extendstart[0], extendtraceinfo.extendstart[1], extendtraceinfo.extendstart[2], starttransformed[0], starttransformed[1], starttransformed[2], extendtraceinfo.extendend[0], extendtraceinfo.extendend[1], extendtraceinfo.extendend[2], endtransformed[0], endtransformed[1], endtransformed[2]);
1763 if (model && model->TraceBox)
1765 if(model->TraceBrush && (inversematrix->m[0][1] || inversematrix->m[0][2] || inversematrix->m[1][0] || inversematrix->m[1][2] || inversematrix->m[2][0] || inversematrix->m[2][1]))
1767 // we get here if TraceBrush exists, AND we have a rotation component (SOLID_BSP case)
1768 // using starttransformed, endtransformed is WRONG in this case!
1769 // should rather build a brush and trace using it
1770 colboxbrushf_t thisbrush_start, thisbrush_end;
1771 Collision_BrushForBox(&thisbrush_start, mins, maxs, 0, 0, NULL);
1772 Collision_BrushForBox(&thisbrush_end, mins, maxs, 0, 0, NULL);
1773 Collision_TranslateBrush(extendtraceinfo.extendstart, &thisbrush_start.brush);
1774 Collision_TranslateBrush(extendtraceinfo.extendend, &thisbrush_end.brush);
1775 Collision_TransformBrush(inversematrix, &thisbrush_start.brush);
1776 Collision_TransformBrush(inversematrix, &thisbrush_end.brush);
1777 //Collision_TranslateBrush(starttransformed, &thisbrush_start.brush);
1778 //Collision_TranslateBrush(endtransformed, &thisbrush_end.brush);
1779 model->TraceBrush(model, frameblend, skeleton, trace, &thisbrush_start.brush, &thisbrush_end.brush, hitsupercontentsmask, skipsupercontentsmask);
1781 else // this is only approximate if rotated, quite useless
1782 model->TraceBox(model, frameblend, skeleton, trace, starttransformed, mins, maxs, endtransformed, hitsupercontentsmask, skipsupercontentsmask);
1784 else // and this requires that the transformation matrix doesn't have angles components, like SV_TraceBox ensures; FIXME may get called if a model is SOLID_BSP but has no TraceBox function
1785 Collision_ClipTrace_Box(trace, bodymins, bodymaxs, starttransformed, mins, maxs, endtransformed, hitsupercontentsmask, skipsupercontentsmask, bodysupercontents, 0, NULL);
1787 Collision_ClipExtendFinish(&extendtraceinfo);
1790 // NOTE: this relies on plane.dist being directly after plane.normal
1791 Matrix4x4_TransformPositivePlane(matrix, trace->plane.normal[0], trace->plane.normal[1], trace->plane.normal[2], trace->plane.dist, trace->plane.normal_and_dist);
1794 void Collision_ClipToWorld(trace_t *trace, dp_model_t *model, const vec3_t tstart, const vec3_t mins, const vec3_t maxs, const vec3_t tend, int hitsupercontentsmask, int skipsupercontentsmask, float extend)
1796 extendtraceinfo_t extendtraceinfo;
1797 Collision_ClipExtendPrepare(&extendtraceinfo, trace, tstart, tend, extend);
1798 // ->TraceBox: TraceBrush not needed here, as worldmodel is never rotated
1799 if (model && model->TraceBox)
1800 model->TraceBox(model, NULL, NULL, trace, extendtraceinfo.extendstart, mins, maxs, extendtraceinfo.extendend, hitsupercontentsmask, skipsupercontentsmask);
1801 Collision_ClipExtendFinish(&extendtraceinfo);
1804 void Collision_ClipLineToGenericEntity(trace_t *trace, dp_model_t *model, const frameblend_t *frameblend, const skeleton_t *skeleton, const vec3_t bodymins, const vec3_t bodymaxs, int bodysupercontents, matrix4x4_t *matrix, matrix4x4_t *inversematrix, const vec3_t tstart, const vec3_t tend, int hitsupercontentsmask, int skipsupercontentsmask, float extend, qboolean hitsurfaces)
1806 vec3_t starttransformed, endtransformed;
1807 extendtraceinfo_t extendtraceinfo;
1808 Collision_ClipExtendPrepare(&extendtraceinfo, trace, tstart, tend, extend);
1810 Matrix4x4_Transform(inversematrix, extendtraceinfo.extendstart, starttransformed);
1811 Matrix4x4_Transform(inversematrix, extendtraceinfo.extendend, endtransformed);
1812 #if COLLISIONPARANOID >= 3
1813 Con_Printf("trans(%f %f %f -> %f %f %f, %f %f %f -> %f %f %f)", extendtraceinfo.extendstart[0], extendtraceinfo.extendstart[1], extendtraceinfo.extendstart[2], starttransformed[0], starttransformed[1], starttransformed[2], extendtraceinfo.extendend[0], extendtraceinfo.extendend[1], extendtraceinfo.extendend[2], endtransformed[0], endtransformed[1], endtransformed[2]);
1816 if (model && model->TraceLineAgainstSurfaces && hitsurfaces)
1817 model->TraceLineAgainstSurfaces(model, frameblend, skeleton, trace, starttransformed, endtransformed, hitsupercontentsmask, skipsupercontentsmask);
1818 else if (model && model->TraceLine)
1819 model->TraceLine(model, frameblend, skeleton, trace, starttransformed, endtransformed, hitsupercontentsmask, skipsupercontentsmask);
1821 Collision_ClipTrace_Box(trace, bodymins, bodymaxs, starttransformed, vec3_origin, vec3_origin, endtransformed, hitsupercontentsmask, skipsupercontentsmask, bodysupercontents, 0, NULL);
1823 Collision_ClipExtendFinish(&extendtraceinfo);
1826 // NOTE: this relies on plane.dist being directly after plane.normal
1827 Matrix4x4_TransformPositivePlane(matrix, trace->plane.normal[0], trace->plane.normal[1], trace->plane.normal[2], trace->plane.dist, trace->plane.normal_and_dist);
1830 void Collision_ClipLineToWorld(trace_t *trace, dp_model_t *model, const vec3_t tstart, const vec3_t tend, int hitsupercontentsmask, int skipsupercontentsmask, float extend, qboolean hitsurfaces)
1832 extendtraceinfo_t extendtraceinfo;
1833 Collision_ClipExtendPrepare(&extendtraceinfo, trace, tstart, tend, extend);
1835 if (model && model->TraceLineAgainstSurfaces && hitsurfaces)
1836 model->TraceLineAgainstSurfaces(model, NULL, NULL, trace, extendtraceinfo.extendstart, extendtraceinfo.extendend, hitsupercontentsmask, skipsupercontentsmask);
1837 else if (model && model->TraceLine)
1838 model->TraceLine(model, NULL, NULL, trace, extendtraceinfo.extendstart, extendtraceinfo.extendend, hitsupercontentsmask, skipsupercontentsmask);
1840 Collision_ClipExtendFinish(&extendtraceinfo);
1843 void Collision_ClipPointToGenericEntity(trace_t *trace, dp_model_t *model, const frameblend_t *frameblend, const skeleton_t *skeleton, const vec3_t bodymins, const vec3_t bodymaxs, int bodysupercontents, matrix4x4_t *matrix, matrix4x4_t *inversematrix, const vec3_t start, int hitsupercontentsmask, int skipsupercontentsmask)
1845 float starttransformed[3];
1846 memset(trace, 0, sizeof(*trace));
1847 trace->fraction = 1;
1849 Matrix4x4_Transform(inversematrix, start, starttransformed);
1850 #if COLLISIONPARANOID >= 3
1851 Con_Printf("trans(%f %f %f -> %f %f %f)", start[0], start[1], start[2], starttransformed[0], starttransformed[1], starttransformed[2]);
1854 if (model && model->TracePoint)
1855 model->TracePoint(model, NULL, NULL, trace, starttransformed, hitsupercontentsmask, skipsupercontentsmask);
1857 Collision_ClipTrace_Point(trace, bodymins, bodymaxs, starttransformed, hitsupercontentsmask, skipsupercontentsmask, bodysupercontents, 0, NULL);
1859 VectorCopy(start, trace->endpos);
1861 // NOTE: this relies on plane.dist being directly after plane.normal
1862 Matrix4x4_TransformPositivePlane(matrix, trace->plane.normal[0], trace->plane.normal[1], trace->plane.normal[2], trace->plane.dist, trace->plane.normal_and_dist);
1865 void Collision_ClipPointToWorld(trace_t *trace, dp_model_t *model, const vec3_t start, int hitsupercontentsmask, int skipsupercontentsmask)
1867 memset(trace, 0, sizeof(*trace));
1868 trace->fraction = 1;
1869 if (model && model->TracePoint)
1870 model->TracePoint(model, NULL, NULL, trace, start, hitsupercontentsmask, skipsupercontentsmask);
1871 VectorCopy(start, trace->endpos);
1874 void Collision_CombineTraces(trace_t *cliptrace, const trace_t *trace, void *touch, qboolean isbmodel)
1876 // take the 'best' answers from the new trace and combine with existing data
1877 if (trace->allsolid)
1878 cliptrace->allsolid = true;
1879 if (trace->startsolid)
1882 cliptrace->bmodelstartsolid = true;
1883 cliptrace->startsolid = true;
1884 if (cliptrace->fraction == 1)
1885 cliptrace->ent = touch;
1886 if (cliptrace->startdepth > trace->startdepth)
1888 cliptrace->startdepth = trace->startdepth;
1889 VectorCopy(trace->startdepthnormal, cliptrace->startdepthnormal);
1892 // don't set this except on the world, because it can easily confuse
1893 // monsters underwater if there's a bmodel involved in the trace
1894 // (inopen && inwater is how they check water visibility)
1895 //if (trace->inopen)
1896 // cliptrace->inopen = true;
1898 cliptrace->inwater = true;
1899 if ((trace->fraction < cliptrace->fraction) && (VectorLength2(trace->plane.normal) > 0))
1901 cliptrace->fraction = trace->fraction;
1902 VectorCopy(trace->endpos, cliptrace->endpos);
1903 cliptrace->plane = trace->plane;
1904 cliptrace->ent = touch;
1905 cliptrace->hitsupercontents = trace->hitsupercontents;
1906 cliptrace->hitq3surfaceflags = trace->hitq3surfaceflags;
1907 cliptrace->hittexture = trace->hittexture;
1909 cliptrace->startsupercontents |= trace->startsupercontents;