assimp.assimp/test/models/3DS/UVTransformTest/note.txt

All 'mirror' files are not absolutely correct. That's mainly 
because it's difficult convert Max' handling of mirroring to 
our's.

In other words: TO DO, but only if someone REALLY needs it.

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To see how it should look like - test/ReferenceImages
Note that the viewer has no 'decal' texture mapping mode, so
the usual clamping is used.