simulink, vrml and Real Time manipulation of 3D surface

How to change in simulink via VR sink the 3d coordinates of the points defining a 3d object or surface (defined as indexedfaceset in vrml)? I'm able to manipulate in real time the coordinates, size of 3D objets contained in a vrml file but I fail to understand how to manipulate the shape itself by changing points' coordinate independantly. Is this even possible ? Thanks in advance for help