PDA

View Full Version : 3d textures.



kvinther
03-11-2004, 12:25 AM
Hi.

I have a n*n*n set af data, that I would like to put into a 3D texture, and then use the texture to look up linearly interpolated values...

It seems though, that the function glTexImage3D has been removed from the OpenGL reference manual. Has it become deprecated?

Jan
03-11-2004, 02:26 AM
No it is still there. Although it is handled a bit strange.

3D Texturing is still like an extension, so you have to initialize a function-pointer to that function first. However 3D texturing is not listed in the extension string, so you cannot find out, if it is supported, by looking at the extension string.

You have to try to get the function pointer and check if it is NULL, if so, 3D texturing is not supported.

You can initialize your stuff easily, by using an extension loading library like glew: http://glew.sourceforge.net/

Bye,
Jan.

arekkusu
03-11-2004, 02:55 AM
3D texturing was promoted to a core feature in OpenGL 1.2. So check the GL version string first. If it is less than 1.2, then you should check the extension string.

Getting the function pointer is of course platform specific. On my machine it just works.

And the documentation is still in the spec and in the man pages.

kvinther
03-11-2004, 03:04 AM
Jolly good.

Actually, I am using OGL 1.4+ and Glew, I was just wondering, why is wasn't mentioned in the reference guide.

So there is no magic tricks needed? - Nice http://www.opengl.org/discussion_boards/ubb/smile.gif!

Thanks