Use an epsilon when testing height equality PTR_ShootTraverse; I expe…

…rienced an infinite loop in the inner algorithm for determining the approximate hitpoint whilst testing AliensTC::E2M5 (far from the only problem I noticed with this mod though) due to this controlling test incorrectly determining that two candidate z coordinates were not equal.
skyjake · Feb 13, 2009 · 7d76644 · 7d76644
1 parent b0a629a
commit 7d76644
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/doomsday/plugins/common/src/p_map.c b/doomsday/plugins/common/src/p_map.c
@@ -1549,7 +1549,7 @@ boolean PTR_ShootTraverse(intercept_t* in)
         d[VY] = pos[VY] - tracePos[VY];
         d[VZ] = pos[VZ] - tracePos[VZ];
 
-        if(d[VZ] != 0)
+        if(!INRANGE_OF(d[VZ], 0, .0001f)) // Epsilon
         {
             contact = R_PointInSubsector(pos[VX], pos[VY]);
             step = P_ApproxDistance3(d[VX], d[VY], d[VZ]);