Same here. It appears Volker has it working with fractals on page 4 of Frank's image post. I can't see where the 'get' node is, though. Apparently inside the parts shader but I can't see where. It must be contained inside another node in there because, what I'm finding is, when the 'get' node and functions are inside another container node(whilst in the parts shader), there are no traceray errors. Take the functions out of the container node, however, and place them straight into the parts shader on their own, kaboom!