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https://bugs.freedesktop.org/show_bug.cgi?id=6098
Summary: Wrong normals with GL_AUTO_NORMAL
Product: Mesa
Version: 6.4
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: [EMAIL PROTECTED]
Hi,
i use 2d evaluators to draw a grid. The grid points are arranged, so that the
parameter u walks along +x and v walks along -z. Calling glEvalMesh() renders a
grid with front faces pointing upwards. (I tested this by explicitly culling
back faces.)
The grid patches normals where generated with GL_AUTO_NORMAL. I guess normals
should also point upwards, but the lighting in the scene behaves, as if normals
where pointing downwards.
Calling glFrontFace(GL_CW) reverses normals as expected, but they still point
into the wrong direction.
The system is Linux 2.6.13, Mesa 6.4.2 SW-Renderer on Xorg 6.7
Regards,
Thomas Zimmermann
[EMAIL PROTECTED]
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