public static Geometry createMeshTestFloor(AssetManager assetManager, float floorDimensions, Vector3f position) {
        Geometry floor = createTestFloor(assetManager, floorDimensions, position, new ColorRGBA(0.5f, 0.5f, 0.9f, 1));
        RigidBodyControl floorControl = new RigidBodyControl(new MeshCollisionShape(floor.getMesh()), 0);
        floor.addControl(floorControl);
        return floor;
    }
Creates a curved "floor" with a MeshCollisionShape provided as the RigidBodyControl's collision shape.
Surface has four slightly concave corners to allow for multiple tests and minimize falling off the edge
of the floor.

@param assetManager for loading assets
@param floorDimensions width/depth of the "floor" (X/Z)
@param position sets the floor's local translation
@return a new Geometry
jme3-examples/src/main/java/jme3test/bullet/PhysicsTestHelper.java