Fixed point volume mapper gives inconsistent results on multiple threads
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
When more then one thread is used, images produced from volume renders using the fixed point mapper contain block-like/pixelated artifacts, subtly different from the same scene rendered with 1 thread.
This can be overcome by setting the global number of threads to 1, but this is undesirable when one wants to take advantage of multiple processors (i.e. for render times when rendering big volumes and large images).