If anyone is interested in a small free game I made you're welcome to download it. It's a 5 min diversion for your busy day. Simply shoot the boxes with the LMB before they explode on the landscape. I threw this together to demo this techniques: First person shooting, line segment to BSP tree intersection, height mapped landscape, decals, view frustum culling, alpha blending, fonts, bill boarding, particle systems, camera shaking, screen flashes, smoke and 3D sounds. You may download it from my site Here's a direct link to the game.