Re-enable path-tracer.
#332
Open
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In #313 I disabled all the code relying on OptiX. I subsequently learned that
path-tracer's use of OptiX is optional.path-traceris a big and good example, so this commit re-enables it, but with the OptiX-specific bits commented out. (Commenting out code is crude, but I had trouble with features, as detailed within the commit. This is better than nothing.)