more work towards GPU Jacobi solver.

Not fully working yet, GPU version shows explosion at high iteration count.

demo/gpudemo/rigidbody/GpuConvexScene.cpp

@@ -84,6 +84,6 @@ void GpuConvexScene::setupScene(const ConstructionInfo& ci)
 	float camPos[4]={ci.arraySizeX,ci.arraySizeY/2,ci.arraySizeZ,0};
 	//float camPos[4]={1,12.5,1.5,0};
 	m_instancingRenderer->setCameraTargetPosition(camPos);
-	m_instancingRenderer->setCameraDistance(20);
+	m_instancingRenderer->setCameraDistance(120);
 	
 }