quaternions

ttom · Post by **ttom** » Wed Oct 22, 2003 3:15 am

Hi anyone:
Does any idea for the quaternions.

[dx/x]=HUNT3R · Post by **[dx/x]=HUNT3R** » Wed Oct 22, 2003 4:13 am

saigumi · Post by **saigumi** » Wed Oct 22, 2003 1:06 pm

http://skal.planet-d.net/demo/matrixfaq.htm#Q45

ttom · Post by **ttom** » Thu Oct 23, 2003 1:32 am

Thanks saigumi for the great document.
Sorry for my question. I mean that the Niko to implement the quaternions ?

sorry for my english.

saigumi · Post by **saigumi** » Thu Oct 23, 2003 2:43 am

In a way, they are already in there, you can use matrices and matrix transformation (quaternions).

The premise for a good portion of Irrlicht is to make it so that you don't have to worry about quaternions or matrices and can think about 3d in more simpler terms of rotation angles and direct X/Y/Z positioning.

If you really feel the need to get low level and make your own matrices, http://irrlicht.sourceforge.net/docu/cl ... trix4.html.

[dx/x]=HUNT3R · Post by **[dx/x]=HUNT3R** » Fri Oct 24, 2003 2:37 am

Just to get my 2 cents in... the quaternions aren't already in the engine and it would be cool if Niko did implement them but I don't know of any plans to do so. Quaternions can be used as a replacement for rotation matrices as they can describe a rotation around any axis in 3D space. They take up less space than matrices (4 numbers instead of 9), many operations such as multiplication are cheaper than with matrices, and conversion between quaternions and matrices is easy.

t · Post by t » Fri Oct 24, 2003 12:39 pm

So at the moment irrlicht suffers from the gimbal lock problem, right?

[dx/x]=HUNT3R · Post by **[dx/x]=HUNT3R** » Fri Oct 24, 2003 1:44 pm

I haven't had the need to experiment with it myself... but yes. Of course, it would be pretty simple to implement one's own quaternion class and add it to the Irrlicht engine. I might try that if I find the time...

keless · Post by **keless** » Fri Dec 19, 2003 10:41 pm

I made the following class for the GTEngine, but if you'd like feel free to adapt it to the IrrLicht Engine:

http://skyesurfer.net/keless/download/Quaternion.h
http://skyesurfer.net/keless/download/Quaternion.cpp