ProjectedTetraHedraMapper fails on OsX when using offscreen rendering
Simply run volume.py with pvpython as follows:
> pvpython volume.py (uses onscreen) > pvpython --use-offscreen-rendering volume.py (uses offscreen)
(If !1800 (merged) is merged, then simply run as follows instead)
> pvpython volume.py (uses onscreen) > pvbatch volume.py (uses offscreen)
The "onscreen" succeeds while offscreen fails to produce a decent
/tmp/foo.png on Ista which is a "El Capitan" with Intel Iris GPU.
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