Reset sparsesdf to free memory.

examples/SharedMemory/PhysicsServerCommandProcessor.cpp

@@ -9693,7 +9693,7 @@ void PhysicsServerCommandProcessor::stepSimulationRealTime(double dtInSec,const
 void PhysicsServerCommandProcessor::resetSimulation()
 {
 	//clean up all data
-
+	m_data->m_dynamicsWorld->getWorldInfo().m_sparsesdf.Reset();
 	if (m_data && m_data->m_guiHelper)
 	{
 		m_data->m_guiHelper->removeAllGraphicsInstances();