# Terrain Deformation and Bitmap Collision

**URL:** <https://forum.kirupa.com/t/terrain-deformation-and-bitmap-collision/303909>\
**Category:** Uncategorized\
**Created:** [January 28, 2010, 9:57pm UTC](https://forum.kirupa.com/t/terrain-deformation-and-bitmap-collision/303909 "2010-01-28T21:57:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dandylion13](https://avatars.discourse-cdn.com/v4/letter/d/c89c15/32.png) [@dandylion13](https://forum.kirupa.com/u/dandylion13)\
**Post date:** [January 28, 2010, 9:57pm UTC](https://forum.kirupa.com/t/terrain-deformation-and-bitmap-collision/303909/1 "2010-01-28T21:57:44Z")

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Hello 🙂

I’ve started playing around with bitmap collision detection. It’s something I haven’t found a use for till now, and I’ve found it’s quite different from other aspects of Flash game design I’ve tinkered around with.

I have three general questions for those of your with more experience in this area:

- Could anyone point me to some good resources on doing terrain deformation (ala Worms)?

- What’s the best technique for doing bitmap collision detection with concave bitmaps (like a mouse in a maze)? I’m aware of Grant Skinner’s method… but it seems rather cumbersome…? Is that the only way?

- If two bitmaps are overlapping, how can one find out by how many pixels?

Thanks very much everyone, any bits of information you could share will be very much appreciated 🙂