Old python STL exporter, as well as other exporters like OBJ,
reverse the face order when object being exported has odd number
of negative scales in the matrix. The C++ STL exporter was lacking
that, resulting in the exported object looking "inside out".
The extra branch inside triangle export inner loop has no measurable
performance impact, probably because it is entirely predictable.
Pull Request: https://projects.blender.org/blender/blender/pulls/124219
Blender is the free and open source 3D creation suite.
It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing,
motion tracking and video editing.
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