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I've always wondered how to do this and I think I've got some idea. I can think of only 2 ways to do this. One would be to set a certain exact color as "blank space" and draw that color to the screen after an explosion has occured that would deform the terrain. This method would, however, require pixel-perfect collision which I really don't know how to do. The other method would be storing "blank spaces" in a dim(800,600), but I would imagine this to be very slow and memory intensive. Does anyone have any good ideas? Am I going at this all wrong?

you might ask in the regular forum its over my head

Use memblocks to deform the terrain image

RPGamer

I am just about to do this in a worms clone I am making.
I am currently going to use an array for each pixel in the game area. I think I am going to store the colour of the pixel in the array for easy drawing of the image. Then just use a memblock to make the image from the data in the array.

It uses quite a lot of memory, an array(3071,767) and a 1024x768 memblock.
I think I should be able to keep the speed at a resonable level without too much clever code.

Unfortunatly it will also require I write some pixel perfect collision routines. I think there are a couple about that others have writen, check the codebase and code snippets forums.

I recently wrote a space invaders type game that uses a similar technique for the shields, the shields are much smaller so speed is obviously less of a problem.
http://winch.dbspot.com/space_inv.php
link is down atm.