only update aabb of active objects, thanks Peter Tchernev for reporting (http://bulletphysics.com/Bullet/phpBB3/viewtopic.php?f=9&t=1764 )

move debug aabb rendering from updateAabb to debugDrawWorld

Demos/ConvexDecompositionDemo/ConvexDecompositionDemo.cpp

@@ -372,6 +372,9 @@ void ConvexDecompositionDemo::clientMoveAndDisplay()
 
 	m_dynamicsWorld->stepSimulation(dt);
 
+	//optional but useful: debug drawing
+	m_dynamicsWorld->debugDrawWorld();
+
 	renderme();
 
 	glFlush();
@@ -386,7 +389,8 @@ void ConvexDecompositionDemo::displayCallback(void) {
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
 
 
-	m_dynamicsWorld->updateAabbs();
+	if (m_dynamicsWorld)
+		m_dynamicsWorld->debugDrawWorld();
 
 	renderme();