add Vehicles/Hinge2Vehicle demo, based on the ForkLift demo, using btHinge2Constraint with rigid body wheels

change btHinge2Constraint to derive from new btGeneric6DofSpring2Constraint

examples/SimpleOpenGL3/CMakeLists.txt

@@ -0,0 +1,52 @@
+
+
+INCLUDE_DIRECTORIES(
+	${BULLET_PHYSICS_SOURCE_DIR}/src 
+	${BULLET_PHYSICS_SOURCE_DIR}/btgui
+)
+ 
+ 
+SET(AppSimpleOpenGL3_SRCS
+	main.cpp
+	${BULLET_PHYSICS_SOURCE_DIR}/build3/bullet.rc
+)
+
+LINK_LIBRARIES(
+        gwen OpenGLWindow Bullet3Common ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY}
+)
+
+IF (WIN32)
+	SET(AppSimpleOpenGL3_SRCS ${AppSimpleOpenGL3_SRCS}  ${AppSimpleOpenGL3_Common_SRCS})
+	INCLUDE_DIRECTORIES(
+				${BULLET_PHYSICS_SOURCE_DIR}/btgui/OpenGLWindow/GlewWindows
+	)
+	ADD_DEFINITIONS(-DGLEW_STATIC)
+ELSE(WIN32)
+	IF(APPLE)
+		find_library(COCOA NAMES Cocoa)
+		MESSAGE(${COCOA})
+		link_libraries(${COCOA})
+	ELSE(APPLE)
+
+                 INCLUDE_DIRECTORIES(
+                                ${BULLET_PHYSICS_SOURCE_DIR}/btgui/OpenGLWindow/GlewWindows
+                 )
+                ADD_DEFINITIONS("-DGLEW_INIT_OPENGL11_FUNCTIONS=1")
+                ADD_DEFINITIONS("-DGLEW_STATIC")
+                ADD_DEFINITIONS("-DGLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS=1")
+
+		LINK_LIBRARIES( X11 pthread dl Xext)
+	ENDIF(APPLE)
+ENDIF(WIN32)
+
+
+ADD_EXECUTABLE(AppSimpleOpenGL3
+		${AppSimpleOpenGL3_SRCS}
+)
+	
+
+IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
+			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  DEBUG_POSTFIX "_Debug")
+			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
+			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)