www.algodoo.com

I do not feel like typing out this whole thing, so just go to this scene: http://www.algodoo.com/algobox/details.php?id=106109

The most simple way to adda "object" filter to a shape is by setting the target objects materialname to something like "teleportable" and then adding this condition statement to your script:

e.other.materialname == "teleportable" ? {your script goes here} :{}