collision fixes

src/core/SurfaceTable.h

@@ -54,6 +54,16 @@ enum
 
 struct CColPoint;
 
+inline bool
+IsSeeThrough(uint8 surfType)
+{
+	switch(surfType)
+	case SURFACE_GLASS:
+	case SURFACE_TRANSPARENT_CLOTH:
+		return true;
+	return false;
+}
+
 class CSurfaceTable
 {
 	static float ms_aAdhesiveLimitTable[NUMADHESIVEGROUPS][NUMADHESIVEGROUPS];