uhh click animate on 3 of the math nodes change values depending on the frame and light position theres nothing "wrong" with realskin if lights move in an animation, its just more work for it to work the same i've even redone the nodes (yes i'm good at math) so i can simply type in the x,y,z coords (easy way) rather than run the script (idiot proof way) or grabbing a calc to type in the formula used to get the 3 values used (not for dummies!) allowing me to move lights and easily reset mat thus lately trying to get other ways to get realistic skin :P i have a really nice shader, but can't find carrara version of "edge blend" node, so thinking i can use formula and just program it in lol :( maybe, need find renderman's formulas >.<