diff --git a/Demos/CMakeLists.txt b/Demos/CMakeLists.txt
index 5d71e358a..d71d84e23 100644
--- a/Demos/CMakeLists.txt
+++ b/Demos/CMakeLists.txt
@@ -1,4 +1,17 @@
-SUBDIRS( OpenGL BasicDemo Benchmarks Box2dDemo CollisionInterfaceDemo ConcaveDemo ConstraintDemo ConvexDecompositionDemo GimpactTestDemo GenericJointDemo SerializeDemo )
+SUBDIRS( 
+OpenGL 
+BasicDemo 
+Benchmarks 
+Box2dDemo 
+CollisionInterfaceDemo 
+ConcaveDemo 
+ConstraintDemo 
+ConvexDecompositionDemo 
+InternalEdgeDemo
+GimpactTestDemo 
+GenericJointDemo 
+SerializeDemo 
+)
 
 
 #todo: re-enable the rest of the demos again
diff --git a/Demos/CollisionInterfaceDemo/CMakeLists.txt b/Demos/CollisionInterfaceDemo/CMakeLists.txt
index b97966ed1..406fecc21 100644
--- a/Demos/CollisionInterfaceDemo/CMakeLists.txt
+++ b/Demos/CollisionInterfaceDemo/CMakeLists.txt
@@ -25,6 +25,21 @@ IF (USE_GLUT)
 			main.cpp
 	        
 	)
+	IF (WIN32)
+		IF (CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET AppCollisionInterfaceDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/glut64.dll ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ELSE(CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET AppCollisionInterfaceDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ENDIF(CMAKE_CL_64)
+	ENDIF(WIN32)
 ELSE (USE_GLUT)
 	INCLUDE_DIRECTORIES(
 	${BULLET_PHYSICS_SOURCE_DIR}/src ${BULLET_PHYSICS_SOURCE_DIR}/Demos/OpenGL 
diff --git a/Demos/CollisionInterfaceDemo/CollisionInterfaceDemo.cpp b/Demos/CollisionInterfaceDemo/CollisionInterfaceDemo.cpp
index ebfdc1515..857ef7ddc 100644
--- a/Demos/CollisionInterfaceDemo/CollisionInterfaceDemo.cpp
+++ b/Demos/CollisionInterfaceDemo/CollisionInterfaceDemo.cpp
@@ -36,12 +36,9 @@ const int numObjects = 2;
 
 GL_Simplex1to4 simplex;
 
-
 btCollisionObject	objects[maxNumObjects];
 btCollisionWorld*	collisionWorld = 0;
 
-int screenWidth = 640;
-int screenHeight = 480;
 GLDebugDrawer debugDrawer;
 
 
diff --git a/Demos/CollisionInterfaceDemo/main.cpp b/Demos/CollisionInterfaceDemo/main.cpp
index bb09a6a03..4c0f65120 100644
--- a/Demos/CollisionInterfaceDemo/main.cpp
+++ b/Demos/CollisionInterfaceDemo/main.cpp
@@ -3,6 +3,10 @@
 #include "GlutStuff.h"
 #include "btBulletDynamicsCommon.h"
 
+int screenWidth = 640;
+int screenHeight = 480;
+
+
 int main(int argc,char** argv)
 {
 	CollisionInterfaceDemo* collisionInterfaceDemo = new CollisionInterfaceDemo();
diff --git a/Demos/ConcaveDemo/CMakeLists.txt b/Demos/ConcaveDemo/CMakeLists.txt
index ad973e811..deef32839 100644
--- a/Demos/ConcaveDemo/CMakeLists.txt
+++ b/Demos/ConcaveDemo/CMakeLists.txt
@@ -22,20 +22,20 @@ IF (USE_GLUT)
         	ConcavePhysicsDemo.cpp
         	main.cpp
 	)
-	IF (WIN32)
-		IF (CMAKE_CL_64)
-			ADD_CUSTOM_COMMAND(
-				TARGET AppConcaveDemo
-				POST_BUILD
-				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/glut64.dll ${CMAKE_CURRENT_BINARY_DIR}
-			)
-		ELSE(CMAKE_CL_64)
-			ADD_CUSTOM_COMMAND(
-				TARGET AppConcaveDemo
-				POST_BUILD
-				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
-			)
-		ENDIF(CMAKE_CL_64)
+	IF (WIN32)
+		IF (CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET AppConcaveDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/glut64.dll ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ELSE(CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET AppConcaveDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ENDIF(CMAKE_CL_64)
 	ENDIF(WIN32)
 ELSE (USE_GLUT)
 	
diff --git a/Demos/InternalEdgeDemo/CMakeLists.txt b/Demos/InternalEdgeDemo/CMakeLists.txt
new file mode 100644
index 000000000..826dd6780
--- /dev/null
+++ b/Demos/InternalEdgeDemo/CMakeLists.txt
@@ -0,0 +1,60 @@
+# This is basically the overall name of the project in Visual Studio this is the name of the Solution File
+
+
+# For every executable you have with a main method you should have an add_executable line below.
+# For every add executable line you should list every .cpp and .h file you have associated with that executable.  
+
+
+
+# You shouldn't have to modify anything below this line 
+########################################################
+
+IF (USE_GLUT)
+	INCLUDE_DIRECTORIES(
+	${BULLET_PHYSICS_SOURCE_DIR}/src ${BULLET_PHYSICS_SOURCE_DIR}/Demos/OpenGL 
+	)
+
+	LINK_LIBRARIES(
+	OpenGLSupport BulletDynamics  BulletCollision LinearMath    ${GLUT_glut_LIBRARY} ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY}
+	)
+
+	ADD_EXECUTABLE(AppInternalEdgeDemo
+        	InternalEdgeDemo.cpp
+        	InternalEdgeDemo.h
+        	main.cpp
+	)
+	IF (WIN32)
+		IF (CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET InternalEdgeDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/glut64.dll ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ELSE(CMAKE_CL_64)
+			ADD_CUSTOM_COMMAND(
+				TARGET InternalEdgeDemo
+				POST_BUILD
+				COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
+			)
+		ENDIF(CMAKE_CL_64)
+	ENDIF(WIN32)
+ELSE (USE_GLUT)
+	
+	INCLUDE_DIRECTORIES(
+	${BULLET_PHYSICS_SOURCE_DIR}/src ${BULLET_PHYSICS_SOURCE_DIR}/Demos/OpenGL 
+	)
+
+	LINK_LIBRARIES(
+	OpenGLSupport BulletDynamics  BulletCollision LinearMath   ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY}
+	)
+
+	ADD_EXECUTABLE(AppInternalEdgeDemo
+			WIN32
+			../OpenGL/Win32AppMain.cpp
+        	InternalEdgeDemo.cpp
+        	InternalEdgeDemo.h
+        	Win32InternalEdgeDemo.cpp
+	)
+
+ENDIF (USE_GLUT)
+
diff --git a/Demos/InternalEdgeDemo/InternalEdgeDemo.cpp b/Demos/InternalEdgeDemo/InternalEdgeDemo.cpp
new file mode 100644
index 000000000..9a9c58272
--- /dev/null
+++ b/Demos/InternalEdgeDemo/InternalEdgeDemo.cpp
@@ -0,0 +1,565 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+
+//#define SHIFT_INDICES 1
+#define SWAP_WINDING 1
+//#define ROTATE_GROUND 1
+bool enable=true;
+
+#if defined (SHIFT_INDICES) && !defined (SWAP_WINDING)
+//#define TEST_INCONSISTENT_WINDING
+#endif
+
+
+#include "btBulletDynamicsCommon.h"
+#include "BulletCollision/CollisionDispatch/btInternalEdgeUtility.h"
+
+
+#include "LinearMath/btIDebugDraw.h"
+#include "GLDebugDrawer.h"
+#include "InternalEdgeDemo.h"
+#include "GL_ShapeDrawer.h"
+#include "GlutStuff.h"
+#include "BulletCollision/CollisionShapes/btTriangleShape.h"
+#include "GLDebugDrawer.h"
+GLDebugDrawer	gDebugDrawer;
+
+static btVector3*	gVertices=0;
+static int*	gIndices=0;
+static btBvhTriangleMeshShape* trimeshShape =0;
+static btRigidBody* staticBody = 0;
+static float waveheight = 0.f;
+
+const float TRIANGLE_SIZE=20.f;
+
+
+
+///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback;
+inline btScalar	calculateCombinedFriction(float friction0,float friction1)
+{
+	return 0.f;
+	btScalar friction = friction0 * friction1;
+
+	const btScalar MAX_FRICTION  = 10.f;
+	if (friction < -MAX_FRICTION)
+		friction = -MAX_FRICTION;
+	if (friction > MAX_FRICTION)
+		friction = MAX_FRICTION;
+	return friction;
+
+}
+
+inline btScalar	calculateCombinedRestitution(float restitution0,float restitution1)
+{
+	return restitution0 * restitution1;
+}
+
+
+///////////////////////////////////////////////////////////////
+
+
+static bool CustomMaterialCombinerCallback(btManifoldPoint& cp,	const btCollisionObject* colObj0,int partId0,int index0,const btCollisionObject* colObj1,int partId1,int index1)
+{
+
+	if (enable)
+	{
+		btAdjustInternalEdgeContacts(cp,colObj1,colObj0, partId1,index1);
+	}
+
+	float friction0 = colObj0->getFriction();
+	float friction1 = colObj1->getFriction();
+	float restitution0 = colObj0->getRestitution();
+	float restitution1 = colObj1->getRestitution();
+
+	if (colObj0->getCollisionFlags() & btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK)
+	{
+		friction0 = 1.0;//partId0,index0
+		restitution0 = 0.f;
+	}
+	if (colObj1->getCollisionFlags() & btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK)
+	{
+		if (index1&1)
+		{
+			friction1 = 1.0f;//partId1,index1
+		} else
+		{
+			friction1 = 0.f;
+		}
+		restitution1 = 0.f;
+	}
+
+	cp.m_combinedFriction = calculateCombinedFriction(friction0,friction1);
+	cp.m_combinedRestitution = calculateCombinedRestitution(restitution0,restitution1);
+
+	//this return value is currently ignored, but to be on the safe side: return false if you don't calculate friction
+	return true;
+}
+
+extern ContactAddedCallback		gContactAddedCallback;
+
+	const int NUM_VERTS_X = 2;
+	const int NUM_VERTS_Y = 2;
+	const int totalVerts = NUM_VERTS_X*NUM_VERTS_Y;
+
+void	InternalEdgeDemo::setVertexPositions(float waveheight, float offset)
+{
+	int i;
+	int j;
+
+	for ( i=0;i<NUM_VERTS_X;i++)
+	{
+		for (j=0;j<NUM_VERTS_Y;j++)
+		{
+			gVertices[i+j*NUM_VERTS_X].setValue(
+				(i-NUM_VERTS_X*0.5f)*TRIANGLE_SIZE,
+				//0.f,
+				waveheight*sinf((float)i+offset)*cosf((float)j+offset),
+				(j-NUM_VERTS_Y*0.5f)*TRIANGLE_SIZE);
+		}
+	}
+}
+
+void InternalEdgeDemo::keyboardCallback(unsigned char key, int x, int y)
+{
+	if (key=='n')
+	{
+		enable = !enable;
+	}
+
+	if (key == 'g')
+	{
+		m_animatedMesh = !m_animatedMesh;
+		if (m_animatedMesh)
+		{
+			staticBody->setCollisionFlags( staticBody->getCollisionFlags() | btCollisionObject::CF_KINEMATIC_OBJECT);
+			staticBody->setActivationState(DISABLE_DEACTIVATION);
+		} else
+		{
+			staticBody->setCollisionFlags( staticBody->getCollisionFlags() & ~btCollisionObject::CF_KINEMATIC_OBJECT);
+			staticBody->forceActivationState(ACTIVE_TAG);
+		}
+	}
+
+	DemoApplication::keyboardCallback(key,x,y);
+
+}
+
+
+
+void	InternalEdgeDemo::initPhysics()
+{
+	
+	setTexturing(true);
+	setShadows(false);//true);
+
+	#define TRISIZE 10.f
+
+     gContactAddedCallback = CustomMaterialCombinerCallback;
+
+#define USE_TRIMESH_SHAPE 1
+#ifdef USE_TRIMESH_SHAPE
+
+	int vertStride = sizeof(btVector3);
+	int indexStride = 3*sizeof(int);
+
+	
+	const int totalTriangles = 2*(NUM_VERTS_X-1)*(NUM_VERTS_Y-1);
+
+	gVertices = new btVector3[totalVerts];
+	gIndices = new int[totalTriangles*3];
+
+	int i;
+
+
+	setVertexPositions(waveheight,0.f);
+	
+	
+	//gVertices[1].setY(21.1);
+	//gVertices[1].setY(121.1);
+	gVertices[1].setY(.1);
+
+#ifdef ROTATE_GROUND
+	//gVertices[1].setY(-1.1);
+#else
+	//gVertices[1].setY(0.1);
+	//gVertices[1].setY(-0.1);
+	//gVertices[1].setY(-20.1);
+	//gVertices[1].setY(-20);
+#endif
+	
+	int index=0;
+	for ( i=0;i<NUM_VERTS_X-1;i++)
+	{
+		for (int j=0;j<NUM_VERTS_Y-1;j++)
+		{
+
+#ifdef SWAP_WINDING
+#ifdef SHIFT_INDICES
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			gIndices[index++] = j*NUM_VERTS_X+i+1;
+			
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			
+#else
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			gIndices[index++] = j*NUM_VERTS_X+i+1;
+			gIndices[index++] = j*NUM_VERTS_X+i;
+
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			gIndices[index++] = j*NUM_VERTS_X+i;
+#endif //SHIFT_INDICES
+#else //SWAP_WINDING
+
+#ifdef SHIFT_INDICES
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = j*NUM_VERTS_X+i+1;
+
+#ifdef TEST_INCONSISTENT_WINDING
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+
+#else //TEST_INCONSISTENT_WINDING
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i;
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+#endif //TEST_INCONSISTENT_WINDING
+			
+			
+			
+#else //SHIFT_INDICES
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = j*NUM_VERTS_X+i+1;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+
+			gIndices[index++] = j*NUM_VERTS_X+i;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
+			gIndices[index++] = (j+1)*NUM_VERTS_X+i;
+#endif //SHIFT_INDICES
+
+#endif //SWAP_WINDING
+
+			
+		}
+	}
+
+	m_indexVertexArrays = new btTriangleIndexVertexArray(totalTriangles,
+		gIndices,
+		indexStride,
+		totalVerts,(btScalar*) &gVertices[0].x(),vertStride);
+
+	
+	bool useQuantizedAabbCompression = true;
+
+//comment out the next line to read the BVH from disk (first run the demo once to create the BVH)
+#define SERIALIZE_TO_DISK 1
+#ifdef SERIALIZE_TO_DISK
+	btVector3 aabbMin(-1000,-1000,-1000),aabbMax(1000,1000,1000);
+	
+	trimeshShape  = new btBvhTriangleMeshShape(m_indexVertexArrays,useQuantizedAabbCompression,aabbMin,aabbMax);
+	m_collisionShapes.push_back(trimeshShape);
+	
+	
+	///we can serialize the BVH data 
+	void* buffer = 0;
+	int numBytes = trimeshShape->getOptimizedBvh()->calculateSerializeBufferSize();
+	buffer = btAlignedAlloc(numBytes,16);
+	bool swapEndian = false;
+	trimeshShape->getOptimizedBvh()->serialize(buffer,numBytes,swapEndian);
+	FILE* file = fopen("bvh.bin","wb");
+	fwrite(buffer,1,numBytes,file);
+	fclose(file);
+	btAlignedFree(buffer);
+	
+
+
+#else
+
+	trimeshShape  = new btBvhTriangleMeshShape(m_indexVertexArrays,useQuantizedAabbCompression,false);
+
+	char* fileName = "bvh.bin";
+
+	FILE* file = fopen(fileName,"rb");
+	int size=0;
+	btOptimizedBvh* bvh = 0;
+
+	if (fseek(file, 0, SEEK_END) || (size = ftell(file)) == EOF || fseek(file, 0, SEEK_SET)) {        /* File operations denied? ok, just close and return failure */
+		printf("Error: cannot get filesize from %s\n", fileName);
+		exit(0);
+	} else
+	{
+
+		fseek(file, 0, SEEK_SET);
+
+		int buffersize = size+btOptimizedBvh::getAlignmentSerializationPadding();
+
+		void* buffer = btAlignedAlloc(buffersize,16);
+		int read = fread(buffer,1,size,file);
+		fclose(file);
+		bool swapEndian = false;
+		bvh = btOptimizedBvh::deSerializeInPlace(buffer,buffersize,swapEndian);
+	}
+
+	trimeshShape->setOptimizedBvh(bvh);
+
+#endif
+
+	btCollisionShape* groundShape = trimeshShape;
+
+	btTriangleInfoMap* triangleInfoMap = new btTriangleInfoMap();
+	
+
+	btGenerateInternalEdgeInfo(trimeshShape,triangleInfoMap);
+	
+
+
+#else
+	btCollisionShape* groundShape = new btBoxShape(btVector3(50,3,50));
+
+	m_collisionShapes.push_back(groundShape);
+
+#endif //USE_TRIMESH_SHAPE
+
+	m_collisionConfiguration = new btDefaultCollisionConfiguration();
+	m_collisionConfiguration->setConvexConvexMultipointIterations(10,5);
+
+
+	m_dispatcher = new	btCollisionDispatcher(m_collisionConfiguration);
+
+
+	btVector3 worldMin(-1000,-1000,-1000);
+	btVector3 worldMax(1000,1000,1000);
+	m_broadphase = new btAxisSweep3(worldMin,worldMax);
+	m_solver = new btSequentialImpulseConstraintSolver();
+	m_dynamicsWorld = new btDiscreteDynamicsWorld(m_dispatcher,m_broadphase,m_solver,m_collisionConfiguration);
+	m_dynamicsWorld->getSolverInfo().m_splitImpulse = true;
+	m_dynamicsWorld->getSolverInfo().m_splitImpulsePenetrationThreshold = 1e30f;
+	m_dynamicsWorld->getSolverInfo().m_maxErrorReduction = 1e30;
+	m_dynamicsWorld->getSolverInfo().m_erp  =1.f;
+	m_dynamicsWorld->getSolverInfo().m_erp2 = 1.f;
+	
+	m_dynamicsWorld->setGravity(btVector3(0,-10,0));
+
+	
+	float mass = 0.f;
+	btTransform	startTransform;
+	startTransform.setIdentity();
+	startTransform.setOrigin(btVector3(0,-2,0));
+
+	btCollisionShape* colShape = new btBoxShape(btVector3(1,1,1));
+	//colShape->setMargin(0.f);
+	colShape->setMargin(0.1f);
+
+
+	m_collisionShapes.push_back(colShape);
+
+	{
+		for (int i=0;i<1;i++)
+		{
+			startTransform.setOrigin(btVector3(-10+i*3,1+i*0.1,-1.3));
+			btRigidBody* body = localCreateRigidBody(100, startTransform,colShape);
+			body->setLinearVelocity(btVector3(0,0,-1));
+		}
+	}
+
+	startTransform.setIdentity();
+#ifdef ROTATE_GROUND
+	btQuaternion orn(btVector3(0,0,1),SIMD_PI);
+	startTransform.setOrigin(btVector3(-20,0,0));
+	startTransform.setRotation(orn);
+#endif //ROTATE_GROUND
+
+	staticBody = localCreateRigidBody(mass, startTransform,groundShape);
+	//staticBody->setContactProcessingThreshold(-0.031f);
+	staticBody->setCollisionFlags(staticBody->getCollisionFlags() | btCollisionObject::CF_KINEMATIC_OBJECT);//STATIC_OBJECT);
+
+	//enable custom material callback
+	staticBody->setCollisionFlags(staticBody->getCollisionFlags()  | btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK);
+
+	getDynamicsWorld()->setDebugDrawer(&gDebugDrawer);
+
+#ifdef BT_INTERNAL_EDGE_DEBUG_DRAW
+	btSetDebugDrawer(&gDebugDrawer);
+#endif //BT_INTERNAL_EDGE_DEBUG_DRAW
+
+	
+}
+
+
+void	InternalEdgeDemo::clientResetScene()
+{
+	DemoApplication::clientResetScene();
+	for (int i=0;i<m_dynamicsWorld->getNumCollisionObjects();i++)
+	{
+		btCollisionObject* colobj = m_dynamicsWorld->getCollisionObjectArray()[i];
+		btRigidBody* body = btRigidBody::upcast(colobj);
+		if (body && body->getInvMass() != 0.f)
+		{
+
+			body->setLinearVelocity(btVector3(0,0,-1));
+		}
+
+	}
+}
+
+void InternalEdgeDemo::clientMoveAndDisplay()
+{
+	 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
+
+	float dt = getDeltaTimeMicroseconds() * 0.000001f;
+
+	if (m_animatedMesh)
+	{
+		static float offset=0.f;
+		offset+=0.01f;
+
+	//	setVertexPositions(waveheight,offset);
+#if 0 ///not currently supported, we need to update the btInternalTriangleInfoMap
+		int i;
+		int j;
+		btVector3 aabbMin(BT_LARGE_FLOAT,BT_LARGE_FLOAT,BT_LARGE_FLOAT);
+		btVector3 aabbMax(-BT_LARGE_FLOAT,-BT_LARGE_FLOAT,-BT_LARGE_FLOAT);
+
+		for ( i=NUM_VERTS_X/2-3;i<NUM_VERTS_X/2+2;i++)
+		{
+			for (j=NUM_VERTS_X/2-3;j<NUM_VERTS_Y/2+2;j++)
+			{
+			
+			aabbMax.setMax(gVertices[i+j*NUM_VERTS_X]);
+			aabbMin.setMin(gVertices[i+j*NUM_VERTS_X]);
+			
+				gVertices[i+j*NUM_VERTS_X].setValue((i-NUM_VERTS_X*0.5f)*TRIANGLE_SIZE,
+					0.f,
+					//waveheight*sinf((float)i+offset)*cosf((float)j+offset),
+					(j-NUM_VERTS_Y*0.5f)*TRIANGLE_SIZE);
+					
+			aabbMin.setMin(gVertices[i+j*NUM_VERTS_X]);
+			aabbMax.setMax(gVertices[i+j*NUM_VERTS_X]);
+
+			}
+		}
+		trimeshShape->partialRefitTree(aabbMin,aabbMax);
+#else
+		btVector3 aabbMin,aabbMax;
+		trimeshShape->getMeshInterface()->calculateAabbBruteForce(aabbMin,aabbMax);
+		trimeshShape->refitTree(aabbMin,aabbMax);
+	
+#endif
+
+		//clear all contact points involving mesh proxy. Note: this is a slow/unoptimized operation.
+		m_dynamicsWorld->getBroadphase()->getOverlappingPairCache()->cleanProxyFromPairs(staticBody->getBroadphaseHandle(),getDynamicsWorld()->getDispatcher());
+	}
+
+
+
+	//m_dynamicsWorld->stepSimulation(dt);
+	///enable one of the following to debug (render debug lines each frame)
+	//m_dynamicsWorld->stepSimulation(1./800.,0);
+	m_dynamicsWorld->stepSimulation(1./60.,100,1./800.);
+	//m_dynamicsWorld->stepSimulation(1./60.,0);
+
+	//optional but useful: debug drawing
+	m_dynamicsWorld->debugDrawWorld();
+
+	
+	renderme();
+
+    glFlush();
+    glutSwapBuffers();
+
+}
+
+
+
+
+void InternalEdgeDemo::displayCallback(void) {
+
+	clientMoveAndDisplay();
+	/*
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
+
+	renderme();
+
+	//optional but useful: debug drawing
+	if (m_dynamicsWorld)
+		m_dynamicsWorld->debugDrawWorld();
+
+
+    glFlush();
+    glutSwapBuffers();
+	*/
+
+}
+
+
+
+void	InternalEdgeDemo::exitPhysics()
+{
+
+
+
+	//cleanup in the reverse order of creation/initialization
+
+	//remove the rigidbodies from the dynamics world and delete them
+	int i;
+	for (i=m_dynamicsWorld->getNumCollisionObjects()-1; i>=0 ;i--)
+	{
+		btCollisionObject* obj = m_dynamicsWorld->getCollisionObjectArray()[i];
+		btRigidBody* body = btRigidBody::upcast(obj);
+		if (body && body->getMotionState())
+		{
+			delete body->getMotionState();
+		}
+		m_dynamicsWorld->removeCollisionObject( obj );
+		delete obj;
+	}
+
+	//delete collision shapes
+	for (int j=0;j<m_collisionShapes.size();j++)
+	{
+		btCollisionShape* shape = m_collisionShapes[j];
+		delete shape;
+	}
+
+	//delete dynamics world
+	delete m_dynamicsWorld;
+
+	if (m_indexVertexArrays)
+		delete m_indexVertexArrays;
+
+	//delete solver
+	delete m_solver;
+
+	//delete broadphase
+	delete m_broadphase;
+
+	//delete dispatcher
+	delete m_dispatcher;
+
+	delete m_collisionConfiguration;
+
+	
+}
+
+
+
+
diff --git a/Demos/InternalEdgeDemo/InternalEdgeDemo.h b/Demos/InternalEdgeDemo/InternalEdgeDemo.h
new file mode 100644
index 000000000..346791c7a
--- /dev/null
+++ b/Demos/InternalEdgeDemo/InternalEdgeDemo.h
@@ -0,0 +1,86 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+#ifndef CONCAVE_DEMO_H
+#define CONCAVE_DEMO_H
+
+#include "GlutDemoApplication.h"
+#include "LinearMath/btAlignedObjectArray.h"
+
+class btBroadphaseInterface;
+class btCollisionShape;
+class btOverlappingPairCache;
+class btCollisionDispatcher;
+class btConstraintSolver;
+struct btCollisionAlgorithmCreateFunc;
+class btDefaultCollisionConfiguration;
+class btTriangleIndexVertexArray;
+
+///InternalEdgeDemo shows usage of static concave triangle meshes
+///It also shows per-triangle material (friction/restitution) through CustomMaterialCombinerCallback
+class InternalEdgeDemo : public GlutDemoApplication
+{
+
+	//keep the collision shapes, for deletion/cleanup
+	btAlignedObjectArray<btCollisionShape*>	m_collisionShapes;
+
+	btTriangleIndexVertexArray* m_indexVertexArrays;
+
+	btBroadphaseInterface*	m_broadphase;
+
+	btCollisionDispatcher*	m_dispatcher;
+
+	btConstraintSolver*	m_solver;
+
+	btDefaultCollisionConfiguration* m_collisionConfiguration;
+
+	bool	m_animatedMesh;
+
+	public:
+
+	InternalEdgeDemo() : m_animatedMesh(true)
+	{
+
+	}
+	void	initPhysics();
+
+	void	exitPhysics();
+
+	virtual ~InternalEdgeDemo()
+	{
+		exitPhysics();
+	}
+
+	virtual void	clientResetScene();
+
+	virtual void clientMoveAndDisplay();
+
+	virtual void displayCallback();
+	
+	//to show refit works
+	void	setVertexPositions(float waveheight, float offset);
+	
+	virtual void keyboardCallback(unsigned char key, int x, int y);
+	
+	static DemoApplication* Create()
+	{
+		InternalEdgeDemo* demo = new InternalEdgeDemo();
+		demo->myinit();
+		demo->initPhysics();
+		return demo;
+	};
+};
+
+#endif //CONCAVE_DEMO_H
+
diff --git a/Demos/InternalEdgeDemo/Win32InternalEdgeDemo.cpp b/Demos/InternalEdgeDemo/Win32InternalEdgeDemo.cpp
new file mode 100644
index 000000000..e91d9f7c0
--- /dev/null
+++ b/Demos/InternalEdgeDemo/Win32InternalEdgeDemo.cpp
@@ -0,0 +1,25 @@
+#ifdef _WINDOWS
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "InternalEdgeDemo.h"
+
+///The 'createDemo' function is called from Bullet/Demos/OpenGL/Win32AppMain.cpp to instantiate this particular demo
+DemoApplication*	createDemo()
+{
+	return new InternalEdgeDemo.cpp();
+}
+
+#endif
diff --git a/Demos/InternalEdgeDemo/main.cpp b/Demos/InternalEdgeDemo/main.cpp
new file mode 100644
index 000000000..596ecb385
--- /dev/null
+++ b/Demos/InternalEdgeDemo/main.cpp
@@ -0,0 +1,19 @@
+
+#include "InternalEdgeDemo.h"
+#include "GlutStuff.h"
+
+#include "GLDebugDrawer.h"
+#include "btBulletDynamicsCommon.h"
+
+
+int main(int argc,char** argv)
+{
+
+        InternalEdgeDemo* internalEdgeDemo = new InternalEdgeDemo();
+        internalEdgeDemo->initPhysics();
+        internalEdgeDemo->setCameraDistance(30.f);
+
+
+        return glutmain(argc, argv,640,480,"Internal Edge Demo",internalEdgeDemo);
+}
+
diff --git a/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp b/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
index 831f319f3..5a2bdacee 100644
--- a/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
+++ b/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
@@ -938,6 +938,16 @@ public:
 		  wv0 = m_worldTrans*triangle[0];
 		  wv1 = m_worldTrans*triangle[1];
 		  wv2 = m_worldTrans*triangle[2];
+		  btVector3 center = (wv0+wv1+wv2)*btScalar(1./3.);
+
+		  btVector3 normal = (wv1-wv0).cross(wv2-wv0);
+		  normal.normalize();
+		  btVector3 normalColor(1,1,0);
+		  m_debugDrawer->drawLine(center,center+normal,normalColor);
+
+
+
+		 
 		  m_debugDrawer->drawLine(wv0,wv1,m_color);
 		  m_debugDrawer->drawLine(wv1,wv2,m_color);
 		  m_debugDrawer->drawLine(wv2,wv0,m_color);
diff --git a/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.cpp b/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.cpp
index 20c0bc522..7601efd89 100644
--- a/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.cpp
+++ b/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.cpp
@@ -6,6 +6,11 @@
 #include "BulletCollision/NarrowPhaseCollision/btManifoldPoint.h"
 #include "LinearMath/btIDebugDraw.h"
 
+//#define DEBUG_INTERNAL_EDGE
+
+#ifdef DEBUG_INTERNAL_EDGE
+#include <stdio.h>
+#endif //DEBUG_INTERNAL_EDGE
 
 
 #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW
@@ -79,9 +84,9 @@ struct btConnectivityProcessor : public btTriangleCallback
 			triangle[2].getX(),triangle[2].getY(),triangle[2].getZ());
 #endif
 
-		for (int j=0;j<3;j++)
+		for (int i=0;i<3;i++)
 		{
-			for (int i=0;i<3;i++)
+			for (int j=0;j<3;j++)
 			{
 				if ( (m_triangleVerticesA[i]-triangle[j]).length2() < m_triangleInfoMap->m_equalVertexThreshold)
 				{
@@ -128,6 +133,7 @@ struct btConnectivityProcessor : public btTriangleCallback
 				int sumvertsA = sharedVertsA[0]+sharedVertsA[1];
 				int otherIndexA = 3-sumvertsA;
 
+				
 				btVector3 edge(m_triangleVerticesA[sharedVertsA[1]]-m_triangleVerticesA[sharedVertsA[0]]);
 
 				btTriangleShape tA(m_triangleVerticesA[0],m_triangleVerticesA[1],m_triangleVerticesA[2]);
@@ -208,12 +214,22 @@ struct btConnectivityProcessor : public btTriangleCallback
 				case 1:
 					{
 						btVector3 edge = m_triangleVerticesA[0]-m_triangleVerticesA[1];
-						btQuaternion orn(edge,correctedAngle);
+						btQuaternion orn(edge,-correctedAngle);
 						btVector3 computedNormalB = quatRotate(orn,normalA);
-						if (computedNormalB.dot(calculatedNormalB)<0)
+						btScalar bla = computedNormalB.dot(normalB);
+						if (bla<0)
+						{
+							computedNormalB*=-1;
 							info->m_flags |= TRI_INFO_V0V1_SWAP_NORMALB;
+						}
+#ifdef DEBUG_INTERNAL_EDGE
+						if ((computedNormalB-normalB).length()>0.0001)
+						{
+							printf("warning: normals not identical\n");
+						}
+#endif//DEBUG_INTERNAL_EDGE
 
-						info->m_edgeV0V1Angle = correctedAngle;
+						info->m_edgeV0V1Angle = -correctedAngle;
 
 						if (isConvex)
 							info->m_flags |= TRI_INFO_V0V1_CONVEX;
@@ -222,12 +238,21 @@ struct btConnectivityProcessor : public btTriangleCallback
 				case 2:
 					{
 						btVector3 edge = m_triangleVerticesA[2]-m_triangleVerticesA[0];
-						btQuaternion orn(edge,correctedAngle);
+						btQuaternion orn(edge,-correctedAngle);
 						btVector3 computedNormalB = quatRotate(orn,normalA);
-						if (computedNormalB.dot(calculatedNormalB)<0)
+						if (computedNormalB.dot(normalB)<0)
+						{
+							computedNormalB*=-1;
 							info->m_flags |= TRI_INFO_V2V0_SWAP_NORMALB;
+						}
 
-						info->m_edgeV2V0Angle = correctedAngle;
+#ifdef DEBUG_INTERNAL_EDGE
+						if ((computedNormalB-normalB).length()>0.0001)
+						{
+							printf("warning: normals not identical\n");
+						}
+#endif //DEBUG_INTERNAL_EDGE
+						info->m_edgeV2V0Angle = -correctedAngle;
 						if (isConvex)
 							info->m_flags |= TRI_INFO_V2V0_CONVEX;
 						break;	
@@ -235,12 +260,20 @@ struct btConnectivityProcessor : public btTriangleCallback
 				case 3:
 					{
 						btVector3 edge = m_triangleVerticesA[1]-m_triangleVerticesA[2];
-						btQuaternion orn(edge,correctedAngle);
+						btQuaternion orn(edge,-correctedAngle);
 						btVector3 computedNormalB = quatRotate(orn,normalA);
-						if (computedNormalB.dot(calculatedNormalB)<0)
+						if (computedNormalB.dot(normalB)<0)
+						{
 							info->m_flags |= TRI_INFO_V1V2_SWAP_NORMALB;
-
-						info->m_edgeV1V2Angle = correctedAngle;
+							computedNormalB*=-1;
+						}
+#ifdef DEBUG_INTERNAL_EDGE
+						if ((computedNormalB-normalB).length()>0.0001)
+						{
+							printf("warning: normals not identical\n");
+						}
+#endif //DEBUG_INTERNAL_EDGE
+						info->m_edgeV1V2Angle = -correctedAngle;
 
 						if (isConvex)
 							info->m_flags |= TRI_INFO_V1V2_CONVEX;
@@ -371,30 +404,26 @@ bool	btClampNormal(const btVector3& edge,const btVector3& tri_normal_org,const b
 
 	btVector3 edgeCross = edge.cross(tri_normal).normalize();
 	btScalar curAngle = btGetAngle(edgeCross,tri_normal,localContactNormalOnB);
+
+	if (correctedEdgeAngle<0)
 	{
-		if (curAngle < -correctedEdgeAngle)
+		if (curAngle < correctedEdgeAngle)
 		{
 			btScalar diffAngle = correctedEdgeAngle-curAngle;
 			btQuaternion rotation(edge,diffAngle );
 			clampedLocalNormal = btMatrix3x3(rotation)*localContactNormalOnB;
 			return true;
+		}
+	}
 
-		} else
+	if (correctedEdgeAngle>=0)
+	{
+		if (curAngle > correctedEdgeAngle)
 		{
-			if (curAngle < correctedEdgeAngle)
-			{
-				//printf("angle within valid convex range, don't clamp it!\n");
-				return false;
-			} else
-			{
-				//			printf("too large angle\n");
-				btScalar diffAngle = correctedEdgeAngle-curAngle;
-
-				btQuaternion rotation(edge,diffAngle );
-				clampedLocalNormal = btMatrix3x3(rotation)*localContactNormalOnB;
-				//clamp it?
-				return true;
-			}
+			btScalar diffAngle = correctedEdgeAngle-curAngle;
+			btQuaternion rotation(edge,diffAngle );
+			clampedLocalNormal = btMatrix3x3(rotation)*localContactNormalOnB;
+			return true;
 		}
 	}
 	return false;
@@ -482,12 +511,20 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 				btVector3 computedNormalB = quatRotate(orn,tri_normal);
 				if (info->m_flags & TRI_INFO_V0V1_SWAP_NORMALB)
 					computedNormalB*=-1;
-				btVector3 nB = computedNormalB;
+				btVector3 nB = swapFactor*computedNormalB;
 
 				btScalar	NdotA = localContactNormalOnB.dot(nA);
 				btScalar	NdotB = localContactNormalOnB.dot(nB);
 				bool backFacingNormal = (NdotA< triangleInfoMapPtr->m_convexEpsilon) && (NdotB<triangleInfoMapPtr->m_convexEpsilon);
 
+#ifdef DEBUG_INTERNAL_EDGE
+				{
+					
+					btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red);
+				}
+#endif //DEBUG_INTERNAL_EDGE
+
+
 				if (backFacingNormal)
 				{
 					numConcaveEdgeHits++;
@@ -496,7 +533,7 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 				{
 					numConvexEdgeHits++;
 					btVector3 clampedLocalNormal;
-					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, swapFactor*info->m_edgeV0V1Angle,clampedLocalNormal);
+					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, info->m_edgeV0V1Angle,clampedLocalNormal);
 					if (isClamped)
 					{
 						btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal;
@@ -553,7 +590,14 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 				btVector3 computedNormalB = quatRotate(orn,tri_normal);
 				if (info->m_flags & TRI_INFO_V1V2_SWAP_NORMALB)
 					computedNormalB*=-1;
-				btVector3 nB = computedNormalB;
+				btVector3 nB = swapFactor*computedNormalB;
+
+#ifdef DEBUG_INTERNAL_EDGE
+				{
+					btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red);
+				}
+#endif //DEBUG_INTERNAL_EDGE
+
 
 				btScalar	NdotA = localContactNormalOnB.dot(nA);
 				btScalar	NdotB = localContactNormalOnB.dot(nB);
@@ -568,7 +612,7 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 					numConvexEdgeHits++;
 					btVector3 localContactNormalOnB = colObj0->getWorldTransform().getBasis().transpose() * cp.m_normalWorldOnB;
 					btVector3 clampedLocalNormal;
-					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, swapFactor*info->m_edgeV1V2Angle,clampedLocalNormal);
+					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, info->m_edgeV1V2Angle,clampedLocalNormal);
 					if (isClamped)
 					{
 						btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal;
@@ -622,7 +666,13 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 				btVector3 computedNormalB = quatRotate(orn,tri_normal);
 				if (info->m_flags & TRI_INFO_V2V0_SWAP_NORMALB)
 					computedNormalB*=-1;
-				btVector3 nB = computedNormalB;
+				btVector3 nB = swapFactor*computedNormalB;
+
+#ifdef DEBUG_INTERNAL_EDGE
+				{
+					btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red);
+				}
+#endif //DEBUG_INTERNAL_EDGE
 
 				btScalar	NdotA = localContactNormalOnB.dot(nA);
 				btScalar	NdotB = localContactNormalOnB.dot(nB);
@@ -640,7 +690,7 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 
 					btVector3 localContactNormalOnB = colObj0->getWorldTransform().getBasis().transpose() * cp.m_normalWorldOnB;
 					btVector3 clampedLocalNormal;
-					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB,swapFactor* info->m_edgeV2V0Angle,clampedLocalNormal);
+					bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB,info->m_edgeV2V0Angle,clampedLocalNormal);
 					if (isClamped)
 					{
 						btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal;
@@ -657,6 +707,12 @@ void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 		}
 	}
 
+#ifdef DEBUG_INTERNAL_EDGE
+	{
+		btVector3 color(0,1,1);
+		btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+cp.m_normalWorldOnB*10,color);
+	}
+#endif //DEBUG_INTERNAL_EDGE
 
 	if (isNearEdge)
 	{
diff --git a/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.h b/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.h
index 3cd88147a..e7e25e609 100644
--- a/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.h
+++ b/src/BulletCollision/CollisionDispatch/btInternalEdgeUtility.h
@@ -75,7 +75,7 @@ void	btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject*
 
 ///Enable the BT_INTERNAL_EDGE_DEBUG_DRAW define and call btSetDebugDrawer, to get visual info to see if the internal edge utility works properly.
 ///If the utility doesn't work properly, you might have to adjust the threshold values in btTriangleInfoMap
-#define BT_INTERNAL_EDGE_DEBUG_DRAW
+//#define BT_INTERNAL_EDGE_DEBUG_DRAW
 
 #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW
 void	btSetDebugDrawer(btIDebugDraw* debugDrawer);