I need help to extract the scale from a Matrix...

[Masoud]

Hello guys,

From a transform matrix attribute (which includes "Transform", "Scale" and "Rotation" values), how can I extract only the "SCALE" component, and then apply it, to the geometry? I mean I don't want the Translate and Rotation of that matrix.

 

I tried the cracktransform() VEX function. If it's a right way, I don't know how to apply that extracted scale, to the geometry:

v@t;
v@r;
v@s;
cracktransform(XFORM_SRT, XFORM_XYZ, {0,0,0}, 4@localtransform, @t, @r, @s);

 

 

Thanks for helping.

 

Edited May 5, 2024 by Masoud

[konstantin magnus]

Hi Masoud,

Extract scale vector from a matrix:

vector s = cracktransform(0, 0, 2, 0.0, 0.0, 4@localtransform);

Apply scale vector to matrix:

matrix m = ident();
scale(m, s);

 

[Masoud]

Hi Konstantin,

Thank you for the solution.

And to apply the scale, I realized that I can also use this geometry attribute:

v@scale = v@s;