I'm sure I'm a bit late, but have you tried keyframing your texture (to make a hole - or what LOOKS like a hole) or model (duplicate model, but add a REAL hole - or add a boolean object)?

The more professional and controllable method would be to do this in a program like After Effects - or Photoshop CS3 Extended which has a new AE-like interface for video. The wall is rendered separately in Poser (or your 3D app of choice), a wall with a new blasted hole is also rendered separately, the explosion is overlaid on top (either created in 3D, or use photographed/filmed/taped footage elements), and any characters sent flying back from it are rendered separately as well (or filmed/taped against greenscreen or bluescreen).

You put them together in the compositing software. Why? Because it goes MUCH faster, and you have MUCH more control. Elements render faster alone, and you can make the explosion bigger, smaller, add layers of fireballs and explosions, add smoke, add haze as a result, add lighting effects, debris, continued sparks from nearby machinery, bits of nearby surfaces on fire as a result, etc.

Try to do ALL of that in your 3D app of choice? You'll wait days per frame - HOPING that you set up all the elements correctly in the first place.

Ever see the first renders of a shot that went bad in a CG movie - when the head turns, eyeballs stay exactly where they were in 3D space and pop completely out of the head - that's FUNNY to watch! And these are seasoned 3D professionals! You never quite know exactly how it'll render out until it's done -or midway through. You're also limited to the ability of the program's renderer as far as realism. Renderman may be a world class renderer, but "Cars" was rendered out separately, and composited together LATER.

If you need a hand, lemme know. Render out the animated elements as Quicktime (Sorenson3 codec, or Animation codec) or AVI files (just Microsoft DV AVI is great), and we'll find a way to hook up and I can put them together fo you.
Hope that helps - good luck!
-Lew ;-)