- dclipnode_t *node;
- mplane_t *plane;
- float t1, t2;
- float frac;
- int i;
- vec3_t mid;
- int side;
- float midf;
-
-loc0:
-// check for empty
- if (num < 0)
- {
- if (num != CONTENTS_SOLID)
- {
- trace->allsolid = false;
- if (num == CONTENTS_EMPTY)
- trace->inopen = true;
- else
- trace->inwater = true;
- }
- else
- trace->startsolid = true;
- return true; // empty
- }
-
- if (num < hull->firstclipnode || num > hull->lastclipnode)
- Sys_Error ("SV_RecursiveHullCheck: bad node number");
-
-//
-// find the point distances
-//
- node = hull->clipnodes + num;
- plane = hull->planes + node->planenum;
-
- t1 = PlaneDiff(p1, plane);
- t2 = PlaneDiff(p2, plane);
-
-#if 1
- if (t1 >= 0 && t2 >= 0)
- // LordHavoc: optimized recursion
-// return SV_RecursiveHullCheck (hull, node->children[0], p1f, p2f, p1, p2, trace);
- {
- num = node->children[0];
- goto loc0;
- }
- if (t1 < 0 && t2 < 0)
-// return SV_RecursiveHullCheck (hull, node->children[1], p1f, p2f, p1, p2, trace);
- {
- num = node->children[1];
- goto loc0;
- }
-#else
- if ( (t1 >= DIST_EPSILON && t2 >= DIST_EPSILON) || (t2 > t1 && t1 >= 0) )
- return SV_RecursiveHullCheck (hull, node->children[0], p1f, p2f, p1, p2, trace);
- if ( (t1 <= -DIST_EPSILON && t2 <= -DIST_EPSILON) || (t2 < t1 && t1 <= 0) )
- return SV_RecursiveHullCheck (hull, node->children[1], p1f, p2f, p1, p2, trace);
-#endif
-
-// put the crosspoint DIST_EPSILON pixels on the near side
- if (t1 < 0)
- frac = bound(0, (t1 + DIST_EPSILON)/(t1-t2), 1);
- else
- frac = bound(0, (t1 - DIST_EPSILON)/(t1-t2), 1);
-
- midf = p1f + (p2f - p1f)*frac;
- mid[0] = p1[0] + frac*(p2[0] - p1[0]);
- mid[1] = p1[1] + frac*(p2[1] - p1[1]);
- mid[2] = p1[2] + frac*(p2[2] - p1[2]);