@Override
    public void read(JmeImporter importer) throws IOException {
        InputCapsule capsule = importer.getCapsule(this);
        collisionGroup = capsule.readInt("collisionGroup", 0x00000001);
        collisionGroupsMask = capsule.readInt("collisionGroupsMask", 0x00000001);
        CollisionShape shape = (CollisionShape) capsule.readSavable("collisionShape", null);
        collisionShape = shape;
    }
@param userObject the userObject to set
jme3-jbullet/src/main/java/com/jme3/bullet/collision/PhysicsCollisionObject.java