]> git.xonotic.org Git - xonotic/darkplaces.git/blobdiff - model_brush.c
Modified ResampleSfx for a small speed gain
[xonotic/darkplaces.git] / model_brush.c
index fb12604d7278c4b8c69ed7e3af3c375d70f0419b..8ba4db8eb70e8e4d3e87b4d6536a5b9c687000a1 100644 (file)
@@ -116,11 +116,13 @@ static int Mod_Q1BSP_FindBoxClusters(model_t *model, const vec3_t mins, const ve
                if (node->plane)
                {
                        // node - recurse down the BSP tree
-                       int side = BoxOnPlaneSide(mins, maxs, node->plane) - 1;
-                       if (side < 2)
+                       int sides = BoxOnPlaneSide(mins, maxs, node->plane);
+                       if (sides < 3)
                        {
+                               if (sides == 0)
+                                       return -1; // ERROR: NAN bounding box!
                                // box is on one side of plane, take that path
-                               node = node->children[side];
+                               node = node->children[sides-1];
                        }
                        else
                        {
@@ -179,11 +181,13 @@ static int Mod_Q1BSP_BoxTouchingPVS(model_t *model, const unsigned char *pvs, co
                if (node->plane)
                {
                        // node - recurse down the BSP tree
-                       int side = BoxOnPlaneSide(mins, maxs, node->plane) - 1;
-                       if (side < 2)
+                       int sides = BoxOnPlaneSide(mins, maxs, node->plane);
+                       if (sides < 3)
                        {
+                               if (sides == 0)
+                                       return -1; // ERROR: NAN bounding box!
                                // box is on one side of plane, take that path
-                               node = node->children[side];
+                               node = node->children[sides-1];
                        }
                        else
                        {
@@ -248,11 +252,13 @@ static int Mod_Q1BSP_BoxTouchingLeafPVS(model_t *model, const unsigned char *pvs
                if (node->plane)
                {
                        // node - recurse down the BSP tree
-                       int side = BoxOnPlaneSide(mins, maxs, node->plane) - 1;
-                       if (side < 2)
+                       int sides = BoxOnPlaneSide(mins, maxs, node->plane);
+                       if (sides < 3)
                        {
+                               if (sides == 0)
+                                       return -1; // ERROR: NAN bounding box!
                                // box is on one side of plane, take that path
-                               node = node->children[side];
+                               node = node->children[sides-1];
                        }
                        else
                        {
@@ -317,11 +323,13 @@ static int Mod_Q1BSP_BoxTouchingVisibleLeafs(model_t *model, const unsigned char
                if (node->plane)
                {
                        // node - recurse down the BSP tree
-                       int side = BoxOnPlaneSide(mins, maxs, node->plane) - 1;
-                       if (side < 2)
+                       int sides = BoxOnPlaneSide(mins, maxs, node->plane);
+                       if (sides < 3)
                        {
+                               if (sides == 0)
+                                       return -1; // ERROR: NAN bounding box!
                                // box is on one side of plane, take that path
-                               node = node->children[side];
+                               node = node->children[sides-1];
                        }
                        else
                        {
@@ -1760,7 +1768,7 @@ static void Mod_Q1BSP_LoadEdges(lump_t *l)
                out->v[1] = (unsigned short)LittleShort(in->v[1]);
                if (out->v[0] >= loadmodel->brushq1.numvertexes || out->v[1] >= loadmodel->brushq1.numvertexes)
                {
-                       Host_Error("Mod_Q1BSP_LoadEdges: %s has invalid vertex indices in edge %i (vertices %i %i >= numvertices %i)\n", loadmodel->name, i, out->v[0], out->v[1], loadmodel->brushq1.numvertexes);
+                       Con_Printf("Mod_Q1BSP_LoadEdges: %s has invalid vertex indices in edge %i (vertices %i %i >= numvertices %i)\n", loadmodel->name, i, out->v[0], out->v[1], loadmodel->brushq1.numvertexes);
                        out->v[0] = 0;
                        out->v[1] = 0;
                }
@@ -2087,8 +2095,6 @@ static void Mod_Q1BSP_LoadFaces(lump_t *l)
                // lighting info
                for (i = 0;i < MAXLIGHTMAPS;i++)
                        surface->lightmapinfo->styles[i] = in->styles[i];
-               // force lightmap upload on first time seeing the surface
-               surface->cached_dlight = true;
                surface->lightmapinfo->lightmaptexturestride = 0;
                surface->lightmaptexture = NULL;
                i = LittleLong(in->lightofs);
@@ -2108,6 +2114,7 @@ static void Mod_Q1BSP_LoadFaces(lump_t *l)
                else // LordHavoc: white lighting (bsp version 29)
                        surface->lightmapinfo->samples = loadmodel->brushq1.lightdata + (i * 3);
 
+               // check if we should apply a lightmap to this
                if (!(surface->lightmapinfo->texinfo->flags & TEX_SPECIAL) || surface->lightmapinfo->samples)
                {
                        int i, iu, iv;
@@ -2115,6 +2122,8 @@ static void Mod_Q1BSP_LoadFaces(lump_t *l)
 
                        if (ssize > 256 || tsize > 256)
                                Host_Error("Bad surface extents");
+                       // force lightmap upload on first time seeing the surface
+                       surface->cached_dlight = true;
                        // stainmap for permanent marks on walls
                        surface->lightmapinfo->stainsamples = (unsigned char *)Mem_Alloc(loadmodel->mempool, ssize * tsize * 3);
                        // clear to white
@@ -2781,7 +2790,7 @@ static void Mod_Q1BSP_RecursiveNodePortals(mnode_t *node)
 
                for (i = 0;i < nodeportal->numpoints*3;i++)
                        frontpoints[i] = nodeportal->points[i];
-               PolygonD_Divide(nodeportal->numpoints, frontpoints, clipplane.normal[0], clipplane.normal[1], clipplane.normal[2], clipplane.dist, 1.0/32.0, MAX_PORTALPOINTS, nodeportal->points, &nodeportal->numpoints, 0, NULL, NULL);
+               PolygonD_Divide(nodeportal->numpoints, frontpoints, clipplane.normal[0], clipplane.normal[1], clipplane.normal[2], clipplane.dist, 1.0/32.0, MAX_PORTALPOINTS, nodeportal->points, &nodeportal->numpoints, 0, NULL, NULL, NULL);
                if (nodeportal->numpoints <= 0 || nodeportal->numpoints >= MAX_PORTALPOINTS)
                        break;
        }
@@ -2819,7 +2828,7 @@ static void Mod_Q1BSP_RecursiveNodePortals(mnode_t *node)
                RemovePortalFromNodes(portal);
 
                // cut the portal into two portals, one on each side of the node plane
-               PolygonD_Divide(portal->numpoints, portal->points, plane->normal[0], plane->normal[1], plane->normal[2], plane->dist, 1.0/32.0, MAX_PORTALPOINTS, frontpoints, &numfrontpoints, MAX_PORTALPOINTS, backpoints, &numbackpoints);
+               PolygonD_Divide(portal->numpoints, portal->points, plane->normal[0], plane->normal[1], plane->normal[2], plane->dist, 1.0/32.0, MAX_PORTALPOINTS, frontpoints, &numfrontpoints, MAX_PORTALPOINTS, backpoints, &numbackpoints, NULL);
 
                if (!numfrontpoints)
                {
@@ -3148,6 +3157,18 @@ void Mod_Q1BSP_Load(model_t *mod, void *buffer, void *bufferend)
        // store which lightmap format to use
        mod->brushq1.lightmaprgba = r_lightmaprgba.integer;
 
+       mod->brush.qw_md4sum = 0;
+       mod->brush.qw_md4sum2 = 0;
+       for (i = 0;i < HEADER_LUMPS;i++)
+       {
+               if (i == LUMP_ENTITIES)
+                       continue;
+               mod->brush.qw_md4sum ^= LittleLong(Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen));
+               if (i == LUMP_VISIBILITY || i == LUMP_LEAFS || i == LUMP_NODES)
+                       continue;
+               mod->brush.qw_md4sum2 ^= LittleLong(Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen));
+       }
+
        Mod_Q1BSP_LoadEntities(&header->lumps[LUMP_ENTITIES]);
        Mod_Q1BSP_LoadVertexes(&header->lumps[LUMP_VERTEXES]);
        Mod_Q1BSP_LoadEdges(&header->lumps[LUMP_EDGES]);
@@ -3751,6 +3772,18 @@ void static Mod_Q2BSP_Load(model_t *mod, void *buffer, void *bufferend)
        // store which lightmap format to use
        mod->brushq1.lightmaprgba = r_lightmaprgba.integer;
 
+       mod->brush.qw_md4sum = 0;
+       mod->brush.qw_md4sum2 = 0;
+       for (i = 0;i < Q2HEADER_LUMPS;i++)
+       {
+               if (i == Q2LUMP_ENTITIES)
+                       continue;
+               mod->brush.qw_md4sum ^= Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen);
+               if (i == Q2LUMP_VISIBILITY || i == Q2LUMP_LEAFS || i == Q2LUMP_NODES)
+                       continue;
+               mod->brush.qw_md4sum2 ^= Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen);
+       }
+
        Mod_Q2BSP_LoadEntities(&header->lumps[Q2LUMP_ENTITIES]);
        Mod_Q2BSP_LoadPlanes(&header->lumps[Q2LUMP_PLANES]);
        Mod_Q2BSP_LoadVertices(&header->lumps[Q2LUMP_VERTEXES]);
@@ -5089,233 +5122,20 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
 {
        int i;
        int sides;
-       float nodesegmentmins[3], nodesegmentmaxs[3];
        mleaf_t *leaf;
        colbrushf_t *brush;
        msurface_t *surface;
-       /*
-               // find which nodes the line is in and recurse for them
-               while (node->plane)
-               {
-                       // recurse down node sides
-                       int startside, endside;
-                       float dist1near, dist1far, dist2near, dist2far;
-                       BoxPlaneCornerDistances(thisbrush_start->mins, thisbrush_start->maxs, node->plane, &dist1near, &dist1far);
-                       BoxPlaneCornerDistances(thisbrush_end->mins, thisbrush_end->maxs, node->plane, &dist2near, &dist2far);
-                       startside = dist1near < 0;
-                       startside = dist1near < 0 ? (dist1far < 0 ? 1 : 2) : (dist1far < 0 ? 2 : 0);
-                       endside = dist2near < 0 ? (dist2far < 0 ? 1 : 2) : (dist2far < 0 ? 2 : 0);
-                       if (startside == 2 || endside == 2)
-                       {
-                               // brushes cross plane
-                               // do not clip anything, just take both sides
-                               Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);
-                               node = node->children[1];
-                               continue;
-                       }
-                       if (startside == 0)
-                       {
-                               if (endside == 0)
-                               {
-                                       node = node->children[0];
-                                       continue;
-                               }
-                               else
-                               {
-                                       //midf0 = dist1near / (dist1near - dist2near);
-                                       //midf1 = dist1far / (dist1far - dist2far);
-                                       Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);
-                                       node = node->children[1];
-                                       continue;
-                               }
-                       }
-                       else
-                       {
-                               if (endside == 0)
-                               {
-                                       //midf0 = dist1near / (dist1near - dist2near);
-                                       //midf1 = dist1far / (dist1far - dist2far);
-                                       Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);
-                                       node = node->children[1];
-                                       continue;
-                               }
-                               else
-                               {
-                                       node = node->children[1];
-                                       continue;
-                               }
-                       }
-
-                       if (dist1near <  0 && dist2near <  0 && dist1far <  0 && dist2far <  0){node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near <  0 && dist1far <  0 && dist2far >= 0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near <  0 && dist1far >= 0 && dist2far <  0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near <  0 && dist1far >= 0 && dist2far >= 0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near >= 0 && dist1far <  0 && dist2far <  0){node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near >= 0 && dist1far <  0 && dist2far >= 0){}
-                       if (dist1near <  0 && dist2near >= 0 && dist1far >= 0 && dist2far <  0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near <  0 && dist2near >= 0 && dist1far >= 0 && dist2far >= 0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near >= 0 && dist2near <  0 && dist1far <  0 && dist2far <  0){node = node->children[1];continue;}
-                       if (dist1near >= 0 && dist2near <  0 && dist1far <  0 && dist2far >= 0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near >= 0 && dist2near <  0 && dist1far >= 0 && dist2far <  0){}
-                       if (dist1near >= 0 && dist2near <  0 && dist1far >= 0 && dist2far >= 0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near >= 0 && dist2near >= 0 && dist1far <  0 && dist2far <  0){Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);node = node->children[1];continue;}
-                       if (dist1near >= 0 && dist2near >= 0 && dist1far <  0 && dist2far >= 0){node = node->children[0];continue;}
-                       if (dist1near >= 0 && dist2near >= 0 && dist1far >= 0 && dist2far <  0){node = node->children[0];continue;}
-                       if (dist1near >= 0 && dist2near >= 0 && dist1far >= 0 && dist2far >= 0){node = node->children[0];continue;}
-                       {
-                               if (dist2near < 0) // d1n<0 && d2n<0
-                               {
-                                       if (dist2near < 0) // d1n<0 && d2n<0
-                                       {
-                                               if (dist2near < 0) // d1n<0 && d2n<0
-                                               {
-                                               }
-                                               else // d1n<0 && d2n>0
-                                               {
-                                               }
-                                       }
-                                       else // d1n<0 && d2n>0
-                                       {
-                                               if (dist2near < 0) // d1n<0 && d2n<0
-                                               {
-                                               }
-                                               else // d1n<0 && d2n>0
-                                               {
-                                               }
-                                       }
-                               }
-                               else // d1n<0 && d2n>0
-                               {
-                               }
-                       }
-                       else // d1n>0
-                       {
-                               if (dist2near < 0) // d1n>0 && d2n<0
-                               {
-                               }
-                               else // d1n>0 && d2n>0
-                               {
-                               }
-                       }
-                       if (dist1near < 0 == dist1far < 0 == dist2near < 0 == dist2far < 0)
-                       {
-                               node = node->children[startside];
-                               continue;
-                       }
-                       if (dist1near < dist2near)
-                       {
-                               // out
-                               if (dist1near >= 0)
-                               {
-                                       node = node->children[0];
-                                       continue;
-                               }
-                               if (dist2far < 0)
-                               {
-                                       node = node->children[1];
-                                       continue;
-                               }
-                               // dist1near < 0 && dist2far >= 0
-                       }
-                       else
-                       {
-                               // in
-                       }
-                       startside = dist1near < 0 ? (dist1far < 0 ? 1 : 2) : (dist1far < 0 ? 2 : 0);
-                       endside = dist2near < 0 ? (dist2far < 0 ? 1 : 2) : (dist2far < 0 ? 2 : 0);
-                       if (startside == 2 || endside == 2)
-                       {
-                               // brushes cross plane
-                               // do not clip anything, just take both sides
-                               Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace, node->children[0], thisbrush_start, thisbrush_end, markframe, segmentmins, segmentmaxs);
-                               node = node->children[1];
-                       }
-                       else if (startside == endside)
-                               node = node->children[startside];
-                       else if (startside == 0) // endside = 1 (start infront, end behind)
-                       {
-                       }
-                       else // startside == 1 endside = 0 (start behind, end infront)
-                       {
-                       }
-                       == endside)
-                       {
-                               if (startside < 2)
-                                       node = node->children[startside];
-                               else
-                               {
-                                       // start and end brush cross plane
-                               }
-                       }
-                       else
-                       {
-                       }
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                               node = node->children[1];
-                       else if (dist1near < 0 && dist1far < 0 && dist2near >= 0 && dist2far >= 0)
-                       else if (dist1near >= 0 && dist1far >= 0 && dist2near < 0 && dist2far < 0)
-                       else if (dist1near >= 0 && dist1far >= 0 && dist2near >= 0 && dist2far >= 0)
-                               node = node->children[0];
-                       else
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                       {
-                       }
-                       else if (dist1near >= 0 && dist1far >= 0)
-                       {
-                       }
-                       else // mixed (lying on plane)
-                       {
-                       }
-                       {
-                               if (dist2near < 0 && dist2far < 0)
-                               {
-                               }
-                               else
-                                       node = node->children[1];
-                       }
-                       if (dist1near < 0 && dist1far < 0 && dist2near < 0 && dist2far < 0)
-                               node = node->children[0];
-                       else if (dist1near >= 0 && dist1far >= 0 && dist2near >= 0 && dist2far >= 0)
-                               node = node->children[1];
-                       else
-                       {
-                               // both sides
-                               Mod_Q3BSP_TraceLine_RecursiveBSPNode(trace, node->children[startside], start, mid, startfrac, midfrac, linestart, lineend, markframe, segmentmins, segmentmaxs);
-                               node = node->children[1];
-                       }
-                       sides = dist1near || dist1near < 0 | dist1far < 0 | dist2near < 0 | dist
-                       startside = dist1 < 0;
-                       endside = dist2 < 0;
-                       if (startside == endside)
-                       {
-                               // most of the time the line fragment is on one side of the plane
-                               node = node->children[startside];
-                       }
-                       else
-                       {
-                               // line crosses node plane, split the line
-                               midfrac = dist1 / (dist1 - dist2);
-                               VectorLerp(start, midfrac, end, mid);
-                               // take the near side first
-                               Mod_Q3BSP_TraceLine_RecursiveBSPNode(trace, node->children[startside], start, mid, startfrac, midfrac, linestart, lineend, markframe, segmentmins, segmentmaxs);
-                               if (midfrac <= trace->fraction)
-                                       Mod_Q3BSP_TraceLine_RecursiveBSPNode(trace, node->children[endside], mid, end, midfrac, endfrac, linestart, lineend, markframe, segmentmins, segmentmaxs);
-                               return;
-                       }
-               }
-       */
+       mplane_t *plane;
+       float nodesegmentmins[3], nodesegmentmaxs[3];
 #if 1
        for (;;)
        {
-               mplane_t *plane = node->plane;
+               plane = node->plane;
                if (!plane)
                        break;
                // axial planes are much more common than non-axial, so an optimized
                // axial case pays off here
+               // we must handle sides == 0 because of NANs (crashing is far worse than recursing the entire tree!)
                if (plane->type < 3)
                {
                        // this is an axial plane, compare bounding box directly to it and
@@ -5323,7 +5143,8 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                        // recurse down node sides
                        // use an inlined axial BoxOnPlaneSide to slightly reduce overhead
                        //sides = BoxOnPlaneSide(nodesegmentmins, nodesegmentmaxs, plane);
-                       sides = ((segmentmaxs[plane->type] >= plane->dist) | ((segmentmins[plane->type] < plane->dist) << 1));
+                       //sides = ((segmentmaxs[plane->type] >= plane->dist) | ((segmentmins[plane->type] < plane->dist) << 1));
+                       sides = ((segmentmaxs[plane->type] >= plane->dist) + ((segmentmins[plane->type] < plane->dist) * 2));
                        if (sides == 3)
                        {
                                // segment box crosses plane
@@ -5350,7 +5171,11 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                                }
                        }
                }
+               if (sides == 0)
+                       return; // ERROR: NAN bounding box!
                // take whichever side the segment box is on
+               //if (sides < 1 || sides > 2)
+               //      Sys_Error("Mod_Q3BSP_TraceBrush_RecursiveBSPNode: side > 2\n");
                node = node->children[sides - 1];
        }
        nodesegmentmins[0] = max(segmentmins[0], node->mins[0]);
@@ -5407,6 +5232,8 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                                node = node->children[1];
                                continue;
                        }
+                       if (sides == 0)
+                               return; // ERROR: NAN bounding box!
                        // take whichever side the segment box is on
                        node = node->children[sides - 1];
                        continue;
@@ -5427,6 +5254,8 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                                        continue;
                                }
                        }
+                       if (sides == 0)
+                               return; // ERROR: NAN bounding box!
                        // take whichever side the segment box is on
                        node = node->children[sides - 1];
                        continue;
@@ -5465,6 +5294,8 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                        }
                        else
                        {
+                               if (sides == 0)
+                                       return; // ERROR: NAN bounding box!
                                // take whichever side the segment box is on
                                node = node->children[sides - 1];
                        }
@@ -5484,6 +5315,8 @@ static void Mod_Q3BSP_TraceBrush_RecursiveBSPNode(trace_t *trace, model_t *model
                                        sides = 2;
                                }
                        }
+                       if (sides == 0)
+                               return; // ERROR: NAN bounding box!
                        // take whichever side the segment box is on
                        node = node->children[sides - 1];
                }
@@ -5527,8 +5360,8 @@ static void Mod_Q3BSP_TraceBox(model_t *model, int frame, trace_t *trace, const
        trace->fraction = 1;
        trace->realfraction = 1;
        trace->hitsupercontentsmask = hitsupercontentsmask;
-       Matrix4x4_CreateIdentity(&startmatrix);
-       Matrix4x4_CreateIdentity(&endmatrix);
+       startmatrix = identitymatrix;
+       endmatrix = identitymatrix;
        segmentmins[0] = min(boxstartmins[0], boxendmins[0]);
        segmentmins[1] = min(boxstartmins[1], boxendmins[1]);
        segmentmins[2] = min(boxstartmins[2], boxendmins[2]);
@@ -5705,6 +5538,18 @@ void Mod_Q3BSP_Load(model_t *mod, void *buffer, void *bufferend)
                header->lumps[i].filelen = LittleLong(header->lumps[i].filelen);
        }
 
+       mod->brush.qw_md4sum = 0;
+       mod->brush.qw_md4sum2 = 0;
+       for (i = 0;i < Q3HEADER_LUMPS;i++)
+       {
+               if (i == Q3LUMP_ENTITIES)
+                       continue;
+               mod->brush.qw_md4sum ^= Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen);
+               if (i == Q3LUMP_PVS || i == Q3LUMP_LEAFS || i == Q3LUMP_NODES)
+                       continue;
+               mod->brush.qw_md4sum2 ^= Com_BlockChecksum(mod_base + header->lumps[i].fileofs, header->lumps[i].filelen);
+       }
+
        Mod_Q3BSP_LoadEntities(&header->lumps[Q3LUMP_ENTITIES]);
        Mod_Q3BSP_LoadTextures(&header->lumps[Q3LUMP_TEXTURES]);
        Mod_Q3BSP_LoadPlanes(&header->lumps[Q3LUMP_PLANES]);