yes, thank you all for the suggestions! its working quite good right now with an animation sequence of only 6 128x128 bitmaps set with ent_setskin. i did not notice any problems with rendering speed as i expected with this method.

this way i can still move the texture around using the matrix and use slins shader on the terrain!

however you do notice the switching a little bit due to only 6 textures in my test, i think it needs at least 16+, so you won't notice the switching anymore.

thanks again everyone!