Fix T37673: Ray casting could fail with 0 collision margins

Use bullet's old method of doing ray casts to stay compatible with old
files. It's faster but a bit less accurate.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.cpp b/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.cpp
index cddc12cc754..b6a46b4307e 100644
--- a/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.cpp
+++ b/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.cpp
@@ -31,6 +31,7 @@ subject to the following restrictions:
 #include "BulletSoftBody/btSoftRigidDynamicsWorld.h"
 #include "BulletSoftBody/btSoftBodyRigidBodyCollisionConfiguration.h"
 #include "BulletCollision/Gimpact/btGImpactCollisionAlgorithm.h"
+#include "BulletCollision/NarrowPhaseCollision/btRaycastCallback.h"
 
 //profiling/timings
 #include "LinearMath/btQuickprof.h"
@@ -1131,6 +1132,8 @@ PHY_IPhysicsController* CcdPhysicsEnvironment::RayTest(PHY_IRayCastFilterCallbac
 
 	// don't collision with sensor object
 	rayCallback.m_collisionFilterMask = CcdConstructionInfo::AllFilter ^ CcdConstructionInfo::SensorFilter;
+	// use faster (less accurate) ray callback, works better with 0 collision margins
+	rayCallback.m_flags |= btTriangleRaycastCallback::kF_UseSubSimplexConvexCastRaytest;
 	//, ,filterCallback.m_faceNormal);
 
 	m_dynamicsWorld->rayTest(rayFrom,rayTo,rayCallback);