Validate BSP vertex input #1653
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enneract
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Apr 19, 2025
VReaperV
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q3map2 produces garbage lightmap values on some surfaces, so do this to make sure we don't get `nan` or `inf`.
slipher
reviewed
Apr 26, 2025
It caused some out of bounds writes. The code assumed that there would, at most, be as many unique vertices as there are vertices in the .bsp, so I kept the hunk allocation that was already there for vertices/indices. With failing equality check though, it generated more vertices than there were oriinally. |
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Requires #1652 because it has some other fixes in this area, I didn't test this pr without those.
Apparently, q3map2 sometimes produces garbage values for lightmap uvs in vertices, like nan or just garbage like -1e38 which later turns into inf in patch meshes. Most of these don't use the lightmapping shader, however from my testing some do.
This fixes a crash in
MergeDuplicateVertices(), which was happening because of these garbages values, since they always compare as false.