Ok I will try.
The magnetoscop from Magnetic is made of lots of polygons close together, like this.
>car going this way>>>||||||||||||||||| <visible side of walls
Each polygon must be given Smoothgroup 9. This makes it act like a wall.
When the car goes through the polygons, the car gets pulled through fast.
Then give them Smoothgroup 11 to make them invisible.
See picture, hope this helps. I selected some of the polygons
(red) to show the smoothgroups.
