Re: [Algorithms] Quaternions

[Jeff L. <je...@di...>]

See my articles online about using Quaternions for animation in OpenGL:

http://www.darwin3d.com/gdm1998.htm#gdm0398
http://www.darwin3d.com/gdm1998.htm#gdm0498

As you will see, the way OpenGL expresses rotations is in axis-angle form which is very compatible with quaternions.

Also, do yourself a favor and don't bring this topic up on any public newsgroups.  Quaternions for some reason reason have become a big deal.  It seems to me that it is just another tool that is useful in certain situations.

-Jeff
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Darwin 3D                               www.darwin3d.com
Game Technology Seminars                www.techsem.com

At 10:29 PM 11/16/2000 -0800, you wrote:
>Hi!
>  
>     This is probably some simple question, but I can't seem to find an answer. Could somebody please point me to some place about quaternions? What are they actually? Are they only used in D3D? I was programming using OpenGL for some time now, but now I've started reading DX8 docs. I didn't meet quaternions in OpenGL, and it seems those are very important in D3D.
>Thanks, and sorry if this is offtopic
>Max