On Tue, Oct 18, 2011 at 4:20 AM, Alexey Karakulov wrote:

I suppose I found the reason. It's in the ControlPoint class. Attached the patch for Graphics/Rendering/OpenGL/GL/ControlPoint.hs

Thanks for the report and the patch. Could I ask you to send a pull request on github to this repository? https://github.com/haskell-opengl/OpenGL Thanks, Jason

On Tue, Oct 18, 2011 at 1:02 PM, Alexey Karakulov wrote:

...

Description: GLU NURBS are rendered wrongly with newer versions of OpenGL. E.g. when the 9-point rectangular representation for a circle is used, this picture is a result (instead of a proper circle): http://i.stack.imgur.com/waoRm.png There are other details at the http://stackoverflow.com/questions/7798662/glu-nurbs-rendered-wrongly

Versions: The bug appears when OpenGL>=2.3 is used. With older versions the NURBS for circle is rendered correctly: $ ghc -package OpenGL-2.2.3.0 -package GLUT-2.1.2.1 --make Circle.hs && ./Circle

Platforms tested: ArchLinux 64-bit, Gentoo (don't know architecture).

The Circle.hs file which draws the NURBS circle is attached.

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