Merge pull request #2438 from MarkSakharov/fix/division_by_zero

Fixing division by zero

src/BulletDynamics/ConstraintSolver/btBatchedConstraints.cpp

@@ -890,6 +890,8 @@ static void setupSpatialGridBatchesMt(
 
 	btVector3 gridExtent = bboxMax - bboxMin;
 
+	gridExtent.setMax(btVector3(btScalar(1), btScalar(1), btScalar(1)));
+
 	btVector3 gridCellSize = consExtent;
 	int gridDim[3];
 	gridDim[0] = int(1.0 + gridExtent.x() / gridCellSize.x());