Collision with land like McGiver's footer

Hi all,

Dunno if you remember McGiver’s footer, but there was something really amazing I’ve never been able to understand : when you launch a bomb in that game, it makes a hole in the ground. I’m assuming this has something to do with masks, but usually masks reveal a part of a clip, whereas in this situation the “mask” seems to hide a small part of the clip.

Any ideas? (assuming you understood what the heck I was talking about)
pom :slight_smile: