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My mesh seems to have a problem with Z-order, unrelated to doubles or X-ray. I've tried exporting this to obj, tossing it through Noesis, I've been unable to get rid of this issue. Is the mesh just bugged or have I missed a crucial setting somewhere? Effects viewport and cripples render.
From Blender version 2.79.7, but this seems to occur in every versions (2.8 / 2.79).
The Perspective Transform is having trouble with the minimum Z-clip being set to 0. Go to the N Properties Region of the 3D view > 'View' panel, and set the 'Start' and 'End' of the clip to sensible values for your project, avoiding a Start of 0.
If you want the TL;DR, check out the 'Remapping the Z coordinate' paragraph on this page. Note that, if n=0, then f*n is always 0, and information is lost.
