private static CompoundCollisionShape createMeshCompoundShape(Node rootNode) {
        return createCompoundShape(rootNode, new CompoundCollisionShape(), true);
    }
This type of collision shape is mesh-accurate and meant for immovable
"world objects". Examples include terrain, houses or whole shooter
levels.
<p>
Objects with "mesh" type collision shape will not collide with each
other.

@param rootNode the node on which to base the shape (not null)
@return a new shape (not null)
jme3-jbullet/src/main/java/com/jme3/bullet/util/CollisionShapeFactory.java