[Mesa-dev] [Bug 44757] one wrong triangle on the balls in foobillard

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44757

--- Comment #2 from almos <aaalmosss at gmail.com> 2012-01-16 16:16:27 PST ---
Created attachment 55654
  --> https://bugs.freedesktop.org/attachment.cgi?id=55654
trianglestrip.txt

I found the problematic triangle for detail=7. The ball geometry is created by
building an icosahedron (same algorithm as in the red book), and subdividing
its faces. detail=7 subdivides to 12 pieces along the edges. The resulting
triangles are put into vertex arrays as triangle strips, and the whole thing is
rendered into a display list (detail=7 is list 21 according to apitrace). The
problematic triangle is the very first one on the 10th face. A dump of that
face is attached (vertex coords, normal coords, texture coords). I applied some
deformations to the faces one-by-one to find the bad one, and the wrong
triangle was also wrong when the face was deformed.

Note that by default the highest detail allowed is 5 ('High' in the menu).
'Very High' (detail=7) cannot be enabled from the menu, unless 'balldetail=v'
is given in ~/.foobillardrc, in which case detail=7 is set initially.

The wrong triangle in detail=4 is on a different face. Should I look it up?

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