=cloth collisions=

Plugged the eltopo library into the cloth solver.
I was playing with it earlier, and it's so easy to
use I decided to quickly put it in (trunk's) cloth.

See http://www.cs.ubc.ca/labs/imager/tr/2009/eltopo/eltopo.html
.  The authors are on the bleeding edge of continuous collision
detection (one of them did ILM's cloth sim).  
I
don't really have to time to plug it into softbody, particles,
bullet, fluid, etc, but doing so would be pretty straightforward.
I'll leave that up to someone else.

To use, turn on USE_ELTOPO (in cmake) or WITH_BF_ELTOPO in scons.

1 files changed, 12 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_collision.h b/source/blender/blenkernel/BKE_collision.h
index b54d4275719..7018a638831 100644
--- a/source/blender/blenkernel/BKE_collision.h
+++ b/source/blender/blenkernel/BKE_collision.h
@@ -63,7 +63,11 @@ struct LinkNode;
 /* COLLISION FLAGS */
 typedef enum
 {
-	COLLISION_IN_FUTURE = ( 1 << 1 ),
+	COLLISION_IN_FUTURE =		(1 << 1),
+#ifdef USE_ELTOPO
+	COLLISION_USE_COLLFACE =	(1 << 2),
+	COLLISION_IS_EDGES =		(1 << 3),
+#endif
 } COLLISION_FLAGS;
 
 
@@ -81,7 +85,13 @@ typedef struct CollPair
 	float pa[3], pb[3]; // collision point p1 on face1, p2 on face2
 	int flag;
 	float time; // collision time, from 0 up to 1
+#ifdef USE_ELTOPO /*either ap* or bp* can be set, but not both*/
+	float bary[3];
+	int ap1, ap2, ap3, collp, bp1, bp2, bp3;
+	int collface;
+#else
 	int ap1, ap2, ap3, bp1, bp2, bp3;
+#endif
 	int pointsb[4];
 }
 CollPair;
@@ -109,6 +119,7 @@ typedef struct FaceCollPair
 	float pa[3], pb[3]; // collision point p1 on face1, p2 on face2
 }
 FaceCollPair;
+
 ////////////////////////////////////////