I've just written an article for performing animation via vertex tweening using an HLSL shader because I havn't found any around on the web but thought it is a pretty useful technique. Hopefully it will be up in the Articles area of gamedev soon, but until then if you would like to look at it (comes with the source), you can download it here: http://equalmeans.net/~chriss/AnimationWithHLSLVertexTweening.zip Let me know what you think, -Chris