Hi flipswitchingmonkey.
If you are still interested.
I started an experiment coding for hidden line removal.
The code changes like inside the BablyonJS code - first time I have tried altering BabylonJS itself.
I am unsure myself about the results but I suspect your cube example would render very well.
Anyway the thread is here…its very long - just scroll down to the pictures first to see if its of any interest.
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I am not sure myself where this is going - it may be the case that very few people want this, the limitations are too severe and that on balance people feel its not worth the upheaval of adding new functionality and options and doc etc.
Right now I am kind of resting on the first step and kind of waiting for my own opinions to catch up.