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James Dansereau d475884456 docs(D288): promote D171 (Silo stray triangle) with user-reproduced, visually-documented repro
User reported a stray triangle during the Silo missile-shaft camera
pan (previously D171, parked since M-34 as "observed, not
investigated"). Reproduced headlessly, precisely bounded to frames
~562-741 of a bare -level_20 boot: a large, flat-shaded, untextured
brown triangle (uniform RGB(83,62,44)) grows then shrinks across the
pan, consistent with a real world-space triangle mis-transformed near
the camera plane rather than a HUD element or garbage vertex-color
read. Points at the D106/D233 near-plane/w-clip neighborhood in
port/fast3d/gfx_pc.cpp, not yet confirmed at the code level. Evidence
saved to docs/img/bugs/. Also noted: foreground `timeout N ...` launches
of the exe from this session's Bash tool produce zero GE_PCDUMP output;
backgrounding the launch works reliably -- worth remembering next time.

Claude-Session: https://claude.ai/code/session_01KwZViAFaXua3PKgHHjNgvi
2026-09-15 20:27:54 -04:00
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