@orient attribute to @N an @up?

[ron2812]

Hi everyone!

Is there a way to calculate @N and @up from the @orient attribute?
Basically the same as the orient to curve SOP does - it only outputs N and up, but i got all the Pitch/Yaw/Roll bells and whistles. 

I have everything layed out on my curve the way i want, but Unreal Engine doesn't seem to read the orient attribute. 

Thanks in advance!

 

[tamagochy]

Convert quaternion to matrix3 and extract rotation vectors from it.

[ikoon]

Hi Ronald, here is the extraction of axes from quaternion in vex:

matrix3 m = qconvert(p@orient);

v@xaxis = set(m.xx, m.xy, m.xz);    
v@yaxis = set(m.yx, m.yy, m.yz);
v@zaxis = set(m.zx, m.zy, m.zz);

 

The default orientation of v@N is zaxis, and @up is yaxis. So this is probably what you need:

matrix3 m = qconvert(p@orient);

v@up = set(m.yx, m.yy, m.yz);
v@N  = set(m.zx, m.zy, m.zz);

 

[ron2812]

Wonderful, thank you! 
Works like a charm

[toadstorm]

Another quick way to do this is to just rotate world N (+Z) and world up (+Y) by your orient quaternion.

v@up = qrotate(p@orient, {0,1,0});
v@N = qrotate(p@orient, {0,0,1});