Thanks for the discussion. It's definitely not a stray node problem. I checked that. The geometry is a simple tiled plane made in C4D. It doesn't show any problems with Poser4 or Poser5 in other places. I didn't check the smooth polygon or texture filter thing yet. Have to try it. Looking at it only areas lighted by certain spotlights are affected. I also have to play with theses lights to see if this changes something. Thanks for your input, any other idea? - Walter