gluUnProject4

Is this what you're looking for?

http://files.filefront.com/glutNglzip/;9933808;/fileinfo.html

There is an installer for OpenGL 2 and it also contains the glut library.

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Original post by sfx81 How can I upgrade my opengl to 2.1, as looking at opengl.org there is nothing like download link.

Newer version of OpenGL are provided in driver updates by the manufacturer of your GPU (usually NVidia, ATI or Intel), check their site for updates.

However, I don't think GL 2.1 will help you with this particular problem, as GLU versions aren't connected to GL versions. You need GLU 1.3 or greater for gluUnProject4(), but unfortunately this is rare, and the only system I know off hand to support it is recent versions of Mac OS X.

What are you trying to accomplish that can't be done with the normal gluUnProject?

Thankyou for reply. I have installed it, but looking at C:\OGLSDK\include\gl\glu.h, it has'nt got any declaration for
gluUnProject4(...).

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What are you trying to accomplish that can't be done with the normal gluUnProject?

I was going through totorial in OpenGL programming Guide. And to perform picking in 3D world, it says to use gluUnProject4(...) if the glDepthRange is greater then 1.0f.

It is extremely rare to use glDepthRange at all. Are you under the impression that if your far and near clipping planes are more than one unit away from each other, your window depth range is greater than one? If so, that's not the case.

You can download GLU 1.3 as part of mesa. Full source code of GLU is included. gluUnProject4 is defined in Mesa-7.2/src/glu/sgi/libutil/project.c .

Thankyou every one very much for quick responses.
I really appreciate it.
Regards