cvar_t collision_enternudge = {0, "collision_enternudge", "0"};
cvar_t collision_leavenudge = {0, "collision_leavenudge", "0"};
-#if 0
-typedef struct
-{
- // the hull we're tracing through
- const hull_t *hull;
-
- // the trace structure to fill in
- trace_t *trace;
-
- // start and end of the trace (in model space)
- double start[3];
- double end[3];
-
- // end - start
- double dist[3];
-
- // overrides the CONTENTS_SOLID in the box bsp tree
- int boxsupercontents;
-}
-RecursiveHullCheckTraceInfo_t;
-
-#define HULLCHECKSTATE_EMPTY 0
-#define HULLCHECKSTATE_SOLID 1
-#define HULLCHECKSTATE_DONE 2
-
-static int RecursiveHullCheck(RecursiveHullCheckTraceInfo_t *t, int num, double p1f, double p2f, double p1[3], double p2[3])
-{
- // status variables, these don't need to be saved on the stack when
- // recursing... but are because this should be thread-safe
- // (note: tracing against a bbox is not thread-safe, yet)
- int ret;
- mplane_t *plane;
- double t1, t2;
-
- // variables that need to be stored on the stack when recursing
- dclipnode_t *node;
- int side;
- double midf, mid[3];
-
- // LordHavoc: a goto! everyone flee in terror... :)
-loc0:
- // check for empty
- if (num < 0)
- {
- num = Mod_Q1BSP_SuperContentsFromNativeContents(NULL, num);
- if (!t->trace->startfound)
- {
- t->trace->startfound = true;
- t->trace->startsupercontents |= num;
- }
- if (num & SUPERCONTENTS_LIQUIDSMASK)
- t->trace->inwater = true;
- if (num == 0)
- t->trace->inopen = true;
- if (num & t->trace->hitsupercontentsmask)
- {
- // if the first leaf is solid, set startsolid
- if (t->trace->allsolid)
- t->trace->startsolid = true;
-#if COLLISIONPARANOID >= 3
- Con_Print("S");
-#endif
- return HULLCHECKSTATE_SOLID;
- }
- else
- {
- t->trace->allsolid = false;
-#if COLLISIONPARANOID >= 3
- Con_Print("E");
-#endif
- return HULLCHECKSTATE_EMPTY;
- }
- }
-
- // find the point distances
- node = t->hull->clipnodes + num;
-
- plane = t->hull->planes + node->planenum;
- if (plane->type < 3)
- {
- t1 = p1[plane->type] - plane->dist;
- t2 = p2[plane->type] - plane->dist;
- }
- else
- {
- t1 = DotProduct (plane->normal, p1) - plane->dist;
- t2 = DotProduct (plane->normal, p2) - plane->dist;
- }
-
- if (t1 < 0)
- {
- if (t2 < 0)
- {
-#if COLLISIONPARANOID >= 3
- Con_Print("<");
-#endif
- num = node->children[1];
- goto loc0;
- }
- side = 1;
- }
- else
- {
- if (t2 >= 0)
- {
-#if COLLISIONPARANOID >= 3
- Con_Print(">");
-#endif
- num = node->children[0];
- goto loc0;
- }
- side = 0;
- }
-
- // the line intersects, find intersection point
- // LordHavoc: this uses the original trace for maximum accuracy
-#if COLLISIONPARANOID >= 3
- Con_Print("M");
-#endif
- if (plane->type < 3)
- {
- t1 = t->start[plane->type] - plane->dist;
- t2 = t->end[plane->type] - plane->dist;
- }
- else
- {
- t1 = DotProduct (plane->normal, t->start) - plane->dist;
- t2 = DotProduct (plane->normal, t->end) - plane->dist;
- }
-
- midf = t1 / (t1 - t2);
- midf = bound(p1f, midf, p2f);
- VectorMA(t->start, midf, t->dist, mid);
-
- // recurse both sides, front side first
- ret = RecursiveHullCheck (t, node->children[side], p1f, midf, p1, mid);
- // if this side is not empty, return what it is (solid or done)
- if (ret != HULLCHECKSTATE_EMPTY)
- return ret;
-
- ret = RecursiveHullCheck (t, node->children[side ^ 1], midf, p2f, mid, p2);
- // if other side is not solid, return what it is (empty or done)
- if (ret != HULLCHECKSTATE_SOLID)
- return ret;
-
- // front is air and back is solid, this is the impact point...
- if (side)
- {
- t->trace->plane.dist = -plane->dist;
- VectorNegate (plane->normal, t->trace->plane.normal);
- }
- else
- {
- t->trace->plane.dist = plane->dist;
- VectorCopy (plane->normal, t->trace->plane.normal);
- }
-
- // calculate the true fraction
- t1 = DotProduct(t->trace->plane.normal, t->start) - t->trace->plane.dist - collision_startnudge.value;
- t2 = DotProduct(t->trace->plane.normal, t->end) - t->trace->plane.dist - collision_endnudge.value;
- midf = t1 / (t1 - t2);
- t->trace->realfraction = bound(0, midf, 1);
-
- // calculate the return fraction which is nudged off the surface a bit
- midf = (t1 - collision_impactnudge.value) / (t1 - t2);
- t->trace->fraction = bound(0, midf, 1);
-
-#if COLLISIONPARANOID >= 3
- Con_Print("D");
-#endif
- return HULLCHECKSTATE_DONE;
-}
-
-#if 0
-// used if start and end are the same
-static void RecursiveHullCheckPoint (RecursiveHullCheckTraceInfo_t *t, int num)
-{
- // If you can read this, you understand BSP trees
- while (num >= 0)
- num = t->hull->clipnodes[num].children[((t->hull->planes[t->hull->clipnodes[num].planenum].type < 3) ? (t->start[t->hull->planes[t->hull->clipnodes[num].planenum].type]) : (DotProduct(t->hull->planes[t->hull->clipnodes[num].planenum].normal, t->start))) < t->hull->planes[t->hull->clipnodes[num].planenum].dist];
-
- // check for empty
- t->trace->endcontents = num;
- if (t->trace->thiscontents)
- {
- if (num == t->trace->thiscontents)
- t->trace->allsolid = false;
- else
- {
- // if the first leaf is solid, set startsolid
- if (t->trace->allsolid)
- t->trace->startsolid = true;
- }
- }
- else
- {
- if (num != CONTENTS_SOLID)
- {
- t->trace->allsolid = false;
- if (num == CONTENTS_EMPTY)
- t->trace->inopen = true;
- else
- t->trace->inwater = true;
- }
- else
- {
- // if the first leaf is solid, set startsolid
- if (t->trace->allsolid)
- t->trace->startsolid = true;
- }
- }
-}
-#endif
-
-static hull_t box_hull;
-static dclipnode_t box_clipnodes[6];
-static mplane_t box_planes[6];
-
-void Mod_Q1BSP_Collision_Init (void)
-{
- int i;
- int side;
-
- //Set up the planes and clipnodes so that the six floats of a bounding box
- //can just be stored out and get a proper hull_t structure.
-
- box_hull.clipnodes = box_clipnodes;
- box_hull.planes = box_planes;
- box_hull.firstclipnode = 0;
- box_hull.lastclipnode = 5;
-
- for (i = 0;i < 6;i++)
- {
- box_clipnodes[i].planenum = i;
-
- side = i&1;
-
- box_clipnodes[i].children[side] = CONTENTS_EMPTY;
- if (i != 5)
- box_clipnodes[i].children[side^1] = i + 1;
- else
- box_clipnodes[i].children[side^1] = CONTENTS_SOLID;
-
- box_planes[i].type = i>>1;
- box_planes[i].normal[i>>1] = 1;
- }
-}
-
-void Collision_ClipTrace_Box(trace_t *trace, const vec3_t cmins, const vec3_t cmaxs, const vec3_t start, const vec3_t mins, const vec3_t maxs, const vec3_t end, int hitsupercontentsmask, int boxsupercontents)
-{
- RecursiveHullCheckTraceInfo_t rhc;
- // fill in a default trace
- memset(&rhc, 0, sizeof(rhc));
- memset(trace, 0, sizeof(trace_t));
- //To keep everything totally uniform, bounding boxes are turned into small
- //BSP trees instead of being compared directly.
- // create a temp hull from bounding box sizes
- box_planes[0].dist = cmaxs[0] - mins[0];
- box_planes[1].dist = cmins[0] - maxs[0];
- box_planes[2].dist = cmaxs[1] - mins[1];
- box_planes[3].dist = cmins[1] - maxs[1];
- box_planes[4].dist = cmaxs[2] - mins[2];
- box_planes[5].dist = cmins[2] - maxs[2];
- // trace a line through the generated clipping hull
- rhc.boxsupercontents = boxsupercontents;
- rhc.hull = &box_hull;
- rhc.trace = trace;
- rhc.trace->hitsupercontentsmask = hitsupercontentsmask;
- rhc.trace->fraction = 1;
- rhc.trace->realfraction = 1;
- rhc.trace->allsolid = true;
- VectorCopy(start, rhc.start);
- VectorCopy(end, rhc.end);
- VectorSubtract(rhc.end, rhc.start, rhc.dist);
- Mod_Q1BSP_RecursiveHullCheck(&rhc, rhc.hull->firstclipnode, 0, 1, rhc.start, rhc.end);
- VectorMA(rhc.start, rhc.trace->fraction, rhc.dist, rhc.trace->endpos);
- if (rhc.trace->startsupercontents)
- rhc.trace->startsupercontents = boxsupercontents;
-}
-#endif
-
void Collision_Init (void)
{
Cvar_RegisterVariable(&collision_impactnudge);
// check if there are too many and skip the brush
if (numplanesbuf >= maxplanesbuf)
{
- Con_Print("Mod_Q3BSP_LoadBrushes: failed to build collision brush: too many planes for buffer\n");
+ Con_Print("Collision_NewBrushFromPlanes: failed to build collision brush: too many planes for buffer\n");
return NULL;
}
float edge0[3], edge1[3], edge2[3], normal[3], dist, bestdist;
colpointf_t *p, *p2;
+ // FIXME: these probably don't actually need to be normalized if the collision code does not care
if (brush->numpoints == 3)
{
// optimized triangle case
brush->numplanes = numpoints + 2;
brush->planes = (void *)(brush + 1);
brush->points = (colpointf_t *)points;
- Host_Error("Collision_AllocBrushFromPermanentPolygonFloat: FIXME: this code needs to be updated to generate a mesh...\n");
+ Sys_Error("Collision_AllocBrushFromPermanentPolygonFloat: FIXME: this code needs to be updated to generate a mesh...\n");
return brush;
}
colbrushf_t *brush;
if (brushforbox_brush[0].numpoints == 0)
Collision_InitBrushForBox();
+ // FIXME: these probably don't actually need to be normalized if the collision code does not care
if (VectorCompare(mins, maxs))
{
// point brush
void Collision_TraceLineTriangleFloat(trace_t *trace, const vec3_t linestart, const vec3_t lineend, const float *point0, const float *point1, const float *point2)
{
+#if 1
+ // more optimized
+ float d1, d2, d, f, impact[3], edgenormal[3], faceplanenormal[3], faceplanedist, faceplanenormallength2, edge01[3], edge21[3], edge02[3];
+
+ // this function executes:
+ // 32 ops when line starts behind triangle
+ // 38 ops when line ends infront of triangle
+ // 43 ops when line fraction is already closer than this triangle
+ // 72 ops when line is outside edge 01
+ // 92 ops when line is outside edge 21
+ // 115 ops when line is outside edge 02
+ // 123 ops when line impacts triangle and updates trace results
+
+ // this code is designed for clockwise triangles, conversion to
+ // counterclockwise would require swapping some things around...
+ // it is easier to simply swap the point0 and point2 parameters to this
+ // function when calling it than it is to rewire the internals.
+
+ // calculate the faceplanenormal of the triangle, this represents the front side
+ // 15 ops
+ VectorSubtract(point0, point1, edge01);
+ VectorSubtract(point2, point1, edge21);
+ CrossProduct(edge01, edge21, faceplanenormal);
+ // there's no point in processing a degenerate triangle (GIGO - Garbage In, Garbage Out)
+ // 6 ops
+ faceplanenormallength2 = DotProduct(faceplanenormal, faceplanenormal);
+ if (faceplanenormallength2 < 0.0001f)
+ return;
+ // calculate the distance
+ // 5 ops
+ faceplanedist = DotProduct(point0, faceplanenormal);
+
+ // if start point is on the back side there is no collision
+ // (we don't care about traces going through the triangle the wrong way)
+
+ // calculate the start distance
+ // 6 ops
+ d1 = DotProduct(faceplanenormal, linestart);
+ if (d1 <= faceplanedist)
+ return;
+
+ // calculate the end distance
+ // 6 ops
+ d2 = DotProduct(faceplanenormal, lineend);
+ // if both are in front, there is no collision
+ if (d2 >= faceplanedist)
+ return;
+
+ // from here on we know d1 is >= 0 and d2 is < 0
+ // this means the line starts infront and ends behind, passing through it
+
+ // calculate the recipricol of the distance delta,
+ // so we can use it multiple times cheaply (instead of division)
+ // 2 ops
+ d = 1.0f / (d1 - d2);
+ // calculate the impact fraction by taking the start distance (> 0)
+ // and subtracting the face plane distance (this is the distance of the
+ // triangle along that same normal)
+ // then multiply by the recipricol distance delta
+ // 2 ops
+ f = (d1 - faceplanedist) * d;
+ // skip out if this impact is further away than previous ones
+ // 1 ops
+ if (f > trace->realfraction)
+ return;
+ // calculate the perfect impact point for classification of insidedness
+ // 9 ops
+ impact[0] = linestart[0] + f * (lineend[0] - linestart[0]);
+ impact[1] = linestart[1] + f * (lineend[1] - linestart[1]);
+ impact[2] = linestart[2] + f * (lineend[2] - linestart[2]);
+
+ // calculate the edge normal and reject if impact is outside triangle
+ // (an edge normal faces away from the triangle, to get the desired normal
+ // a crossproduct with the faceplanenormal is used, and because of the way
+ // the insidedness comparison is written it does not need to be normalized)
+
+ // first use the two edges from the triangle plane math
+ // the other edge only gets calculated if the point survives that long
+
+ // 20 ops
+ CrossProduct(edge01, faceplanenormal, edgenormal);
+ if (DotProduct(impact, edgenormal) > DotProduct(point1, edgenormal))
+ return;
+
+ // 20 ops
+ CrossProduct(faceplanenormal, edge21, edgenormal);
+ if (DotProduct(impact, edgenormal) > DotProduct(point2, edgenormal))
+ return;
+
+ // 23 ops
+ VectorSubtract(point0, point2, edge02);
+ CrossProduct(faceplanenormal, edge02, edgenormal);
+ if (DotProduct(impact, edgenormal) > DotProduct(point0, edgenormal))
+ return;
+
+ // 8 ops (rare)
+
+ // store the new trace fraction
+ trace->realfraction = f;
+
+ // calculate a nudged fraction to keep it out of the surface
+ // (the main fraction remains perfect)
+ trace->fraction = f - collision_impactnudge.value * d;
+
+ // store the new trace plane (because collisions only happen from
+ // the front this is always simply the triangle normal, never flipped)
+ d = 1.0 / sqrt(faceplanenormallength2);
+ VectorScale(faceplanenormal, d, trace->plane.normal);
+ trace->plane.dist = faceplanedist * d;
+#else
float d1, d2, d, f, fnudged, impact[3], edgenormal[3], faceplanenormal[3], faceplanedist, edge[3];
// this code is designed for clockwise triangles, conversion to
d1 = DotProduct(faceplanenormal, linestart) - faceplanedist;
// if start point is on the back side there is no collision
// (we don't care about traces going through the triangle the wrong way)
- if (d1 < 0)
+ if (d1 <= 0)
return;
// calculate the unnormalized end distance
// (an edge normal faces away from the triangle, to get the desired normal
// a crossproduct with the faceplanenormal is used, and because of the way
// the insidedness comparison is written it does not need to be normalized)
-
+
VectorSubtract(point2, point0, edge);
CrossProduct(edge, faceplanenormal, edgenormal);
if (DotProduct(impact, edgenormal) > DotProduct(point0, edgenormal))
// store the new trace plane (because collisions only happen from
// the front this is always simply the triangle normal, never flipped)
+ VectorNormalize(faceplanenormal);
VectorCopy(faceplanenormal, trace->plane.normal);
- VectorNormalize(trace->plane.normal);
trace->plane.dist = DotProduct(point0, faceplanenormal);
// calculate the normalized start and end distances
- d1 = DotProduct(faceplanenormal, linestart) - faceplanedist;
- d2 = DotProduct(faceplanenormal, lineend) - faceplanedist;
+ d1 = DotProduct(trace->plane.normal, linestart) - trace->plane.dist;
+ d2 = DotProduct(trace->plane.normal, lineend) - trace->plane.dist;
// calculate a nudged fraction to keep it out of the surface
// (the main fraction remains perfect)
//trace->endpos[0] = linestart[0] + fnudged * (lineend[0] - linestart[0]);
//trace->endpos[1] = linestart[1] + fnudged * (lineend[1] - linestart[1]);
//trace->endpos[2] = linestart[2] + fnudged * (lineend[2] - linestart[2]);
+#endif
}
typedef struct colbspnode_s