Platform for vehicles and elevators

Troubleshooting physics
1

Hi,



I try to have the main caractercontrol stuck on a platform once it get inside the vehicle or on an elevator platform



i create a joint between the player’s rigid body and the platform body



I used box bodies so far, but i only want collision on one side, not all 6 faces of the box,

so i used simplexCollisionShape and a modified version of Quad (only invertex y and z for the vertices)



but it does not display a debug shape and does not preform collision

Code:
MyQuad plane = new MyQuad(); plane.updateGeometry(dims.x, dims.z,false); Geometry geo= new Geometry(name,plane); 
    geo.setMaterial(mat);
    geo.setLocalTranslation(pos);
     SimplexCollisionShape shape = new SimplexCollisionShape(
                new Vector3f(-dims.x,0, dims.z),
                new Vector3f( dims.x,0, dims.z),
                new Vector3f( dims.x,0,-dims.z),
                new Vector3f(-dims.x,0,-dims.z));
    RigidBodyControl body = new RigidBodyControl(shape,1.5f);
    geo.addControl(body);
    body.setKinematic(true);
    rootNode.attachChild(geo);
    bulletAppState.getPhysicsSpace().add(geo);</div>

anything wrong with my code or the api ?
i saw on another post that bullet did not possibly provide a debug shape, but it should still do collisions :(