VEX quaternion to vectors

[garf]

I know, I know - it's a daft question but nonetheless.....

matrix3 m = maketransform(@N,@up);
@orient = quaternion(m);

will get you a quaternion value from a vector and an up. How do you reverse that?

[symek]

If by reverse you mean how to get original matrix (or N and up):

matrix3 m = qconvert(@orient);

 

[mestela]

...and to finish that thought, now that you have a matrix, you can then take a vector that points along z, and multiply it by the matrix to give you your @N, and a vector that points along x to give you your @up. 

Example here:

http://www.tokeru.com/cgwiki/?title=HoudiniVex#optransform_to_do_a_motion_control_style_camera

 

[garf]

nice one - thanks guys