Frustum sphere culling.

Do a sphere<->camera sphere and a sphere<->frustum before the box<->frustum test.

source/gameengine/Converter/KX_BlenderSceneConverter.cpp

@@ -118,7 +118,9 @@ KX_BlenderSceneConverter::~KX_BlenderSceneConverter()
 		itm++;
 	}
 	
+#ifdef USE_SUMO_SOLID
 	KX_ClearSumoSharedShapes();
+#endif
 }