Added a first version of FractureDemo, showing basic fracture and glue of rigid bodies.

It assumes a btCompoundShaps (where the childshapes are the pre-fractured pieces)
The btFractureBody is a class derived from btRigidBody, dealing with the collision impacts and connectivity/propagating the fracture.
Press the F key to toggle between fracture and glue mode
This is preliminary work, can be used as a starting point to implement your own fracture.

Demos/CMakeLists.txt

@@ -12,7 +12,7 @@ IF (USE_GLUT)
 			SET(SharedDemoSubdirs
 			OpenGL AllBulletDemos  ConvexDecompositionDemo
 			CcdPhysicsDemo ConstraintDemo SliderConstraintDemo GenericJointDemo Raytracer
-			RagdollDemo ForkLiftDemo BasicDemo Box2dDemo BspDemo MovingConcaveDemo VehicleDemo
+			RagdollDemo ForkLiftDemo BasicDemo FractureDemo Box2dDemo BspDemo MovingConcaveDemo VehicleDemo
 			UserCollisionAlgorithm CharacterDemo SoftDemo HeightFieldFluidDemo
 			CollisionInterfaceDemo ConcaveConvexcastDemo SimplexDemo DynamicControlDemo
 			DoublePrecisionDemo ConcaveDemo CollisionDemo
@@ -40,6 +40,7 @@ ELSE (USE_GLUT)
 		SUBDIRS( 
 		OpenGL 
 		BasicDemo 
+		FractureDemo
 		Benchmarks 
 		Box2dDemo 
 		CollisionInterfaceDemo 

Demos/FractureDemo/CMakeLists.txt

@@ -0,0 +1,87 @@
+# 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.  
+
+
+# This is the variable for Windows.  I use this to define the root of my directory structure.
+SET(GLUT_ROOT ${BULLET_PHYSICS_SOURCE_DIR}/Glut)
+
+# You shouldn't have to modify anything below this line 
+########################################################
+
+INCLUDE_DIRECTORIES(
+${BULLET_PHYSICS_SOURCE_DIR}/src ${BULLET_PHYSICS_SOURCE_DIR}/Demos/OpenGL 
+)
+
+
+
+IF (USE_GLUT)
+	LINK_LIBRARIES(
+	OpenGLSupport  BulletDynamics  BulletCollision LinearMath  ${GLUT_glut_LIBRARY} ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY}
+	)
+
+IF (WIN32)
+ADD_EXECUTABLE(AppFractureDemo
+		main.cpp
+		FractureDemo.cpp 
+		FractureDemo.h
+		${BULLET_PHYSICS_SOURCE_DIR}/msvc/bullet.rc
+	)
+ELSE()
+	ADD_EXECUTABLE(AppFractureDemo
+		main.cpp
+		FractureDemo.cpp 
+		FractureDemo.h
+	)
+ENDIF()
+
+
+
+
+	IF (WIN32)
+		IF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+			IF (CMAKE_CL_64)
+				ADD_CUSTOM_COMMAND(
+					TARGET AppFractureDemo
+					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 AppFractureDemo
+					POST_BUILD
+#		  		COMMAND copy /Y ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
+					COMMAND ${CMAKE_COMMAND} ARGS -E copy_if_different ${BULLET_PHYSICS_SOURCE_DIR}/GLUT32.DLL ${CMAKE_CURRENT_BINARY_DIR}
+				)
+			ENDIF(CMAKE_CL_64)
+		ENDIF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+
+	ENDIF(WIN32)
+ELSE (USE_GLUT)
+
+ 
+
+	LINK_LIBRARIES(
+	OpenGLSupport  BulletDynamics  BulletCollision LinearMath  ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY}
+	)
+
+
+	ADD_EXECUTABLE(AppFractureDemo
+		WIN32
+		../OpenGL/Win32AppMain.cpp
+		Win32FractureDemo.cpp
+		FractureDemo.cpp 
+		FractureDemo.h
+		${BULLET_PHYSICS_SOURCE_DIR}/msvc/bullet.rc
+	)
+	
+	
+ENDIF (USE_GLUT)
+
+IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
+			SET_TARGET_PROPERTIES(AppFractureDemo PROPERTIES  DEBUG_POSTFIX "_Debug")
+			SET_TARGET_PROPERTIES(AppFractureDemo PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
+			SET_TARGET_PROPERTIES(AppFractureDemo PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)

Demos/FractureDemo/FractureDemo.h

@@ -0,0 +1,87 @@
+/*
+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 FRACTURE_DEMO_H
+#define FRACTURE_DEMO_H
+
+#ifdef _WINDOWS
+#include "Win32DemoApplication.h"
+#define PlatformDemoApplication Win32DemoApplication
+#else
+#include "GlutDemoApplication.h"
+#define PlatformDemoApplication GlutDemoApplication
+#endif
+
+#include "LinearMath/btAlignedObjectArray.h"
+
+class btBroadphaseInterface;
+class btCollisionShape;
+class btOverlappingPairCache;
+class btCollisionDispatcher;
+class btConstraintSolver;
+struct btCollisionAlgorithmCreateFunc;
+class btDefaultCollisionConfiguration;
+
+///FractureDemo shows basic breaking and glueing of objects
+class FractureDemo : public PlatformDemoApplication
+{
+
+	//keep the collision shapes, for deletion/cleanup
+	btAlignedObjectArray<btCollisionShape*>	m_collisionShapes;
+
+	btBroadphaseInterface*	m_broadphase;
+
+	btCollisionDispatcher*	m_dispatcher;
+
+	btConstraintSolver*	m_solver;
+
+	btDefaultCollisionConfiguration* m_collisionConfiguration;
+
+	void showMessage();
+
+	public:
+
+	FractureDemo()
+	{
+	}
+	virtual ~FractureDemo()
+	{
+		exitPhysics();
+	}
+	void	initPhysics();
+
+	void	exitPhysics();
+
+	virtual void clientMoveAndDisplay();
+
+	virtual void displayCallback();
+	
+	virtual void keyboardCallback(unsigned char key, int x, int y);
+	
+	virtual void keyboardUpCallback(unsigned char key, int x, int y);
+
+	static DemoApplication* Create()
+	{
+		FractureDemo* demo = new FractureDemo;
+		demo->myinit();
+		demo->initPhysics();
+		return demo;
+	}
+
+	void	shootBox(const btVector3& destination);
+	
+};
+
+#endif //FRACTURE_DEMO_H
+

Demos/FractureDemo/Win32FractureDemo.cpp

@@ -0,0 +1,25 @@
+#ifdef _WINDOWS
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2011 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 "FractureDemo.h"
+
+///The 'createDemo' function is called from Bullet/Demos/OpenGL/Win32AppMain.cpp to instantiate this particular demo
+DemoApplication*	createDemo()
+{
+	return new FractureDemo();
+}
+
+#endif

Demos/FractureDemo/main.cpp

@@ -0,0 +1,42 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2007 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.
+*/
+
+#include "FractureDemo.h"
+#include "GlutStuff.h"
+#include "GLDebugDrawer.h"
+#include "btBulletDynamicsCommon.h"
+#include "LinearMath/btHashMap.h"
+
+	
+int main(int argc,char** argv)
+{
+	GLDebugDrawer	gDebugDrawer;
+
+	
+	FractureDemo ccdDemo;
+	ccdDemo.initPhysics();
+	ccdDemo.getDynamicsWorld()->setDebugDrawer(&gDebugDrawer);
+
+
+#ifdef CHECK_MEMORY_LEAKS
+	ccdDemo.exitPhysics();
+#else
+	return glutmain(argc, argv,640,480,"Bullet Physics Demo. http://bulletphysics.com",&ccdDemo);
+#endif
+	
+	//default glut doesn't return from mainloop
+	return 0;
+}
+