to johnpenn: I've tried what you suggested in the past and it is a very tedious process to put all the LW objects ready to be booleaned in Bryce and sometimes the result didn't turn out the way it was supposed to be. I'll just keep trying... :o) to dan: I'll try that suggestion about triangulation. However about the one you mentioned (convex facets..arch cut comment). Like I say, both objects are the same, except the one on the left is one color and the other on the right is two colors. Which is why the left one rendered its booleaned object successfully. Perhaps it may be the reason that Bryce doesn't support multi-color surface materials on booleaned objects. Thanks!