Hi,

this is a try to upload the file...doesn't work... I'll try something else!

here is a link, i hope it will works :

http://www.badongo.com/file/696437

it is a little scene file i made when I first saw your message to see how to do that. Hope it helps!

As silverblade said, use an invisible texture for the footprint, or the same texture as the ground.

Regards,

Anty