Hi!
I followed the Spline Wrap tutorial from entagma:
https://vimeo.com/181458408 [vimeo.com]
But his method doesn't preserve the previous normals. How do I use the matrix to rotate the normals?
-Olivier
Entagma Spline Wrap: keep normals? SOLVED
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- olivierth
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- animatrix_
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Hi,
For normals you can multiply them with the inverse transpose of the matrix:
For normals you can multiply them with the inverse transpose of the matrix:
@N = normalize ( @N * invert ( transpose ( m ) ) );
Senior FX TD @ Industrial Light & Magic
Get to the NEXT level in Houdini & VEX with Pragmatic VEX! [www.pragmatic-vfx.com] https://lnk.bio/animatrix [lnk.bio]
Get to the NEXT level in Houdini & VEX with Pragmatic VEX! [www.pragmatic-vfx.com] https://lnk.bio/animatrix [lnk.bio]
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- olivierth
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I tried it but I'm still getting some funky result.
Since my normals (before the spline wrap deformation) has custom normals on vertex, I used a another wrangle (the first “wrap” is a point wrangle). And I tranfered a gradient float attribute to the vertices (it's used in the primuv function).
Since my normals (before the spline wrap deformation) has custom normals on vertex, I used a another wrangle (the first “wrap” is a point wrangle). And I tranfered a gradient float attribute to the vertices (it's used in the primuv function).
Edited by olivierth - Dec. 9, 2020 12:12:41
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- olivierth
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Solved!
Ok, so I changed 2 things
A: So, one thing I did wrong was in my “Flat_Z” transform sop. I needed the Z to be flat for my spline wrap to work. That node not only flattened the Y position, it also flattened the Y normals!! (Doh!). I set it to only affect position.
B: I used a Transformbyattribute sop and didn't use invert.
-Olivier
Ok, so I changed 2 things
A: So, one thing I did wrong was in my “Flat_Z” transform sop. I needed the Z to be flat for my spline wrap to work. That node not only flattened the Y position, it also flattened the Y normals!! (Doh!). I set it to only affect position.
B: I used a Transformbyattribute sop and didn't use invert.
-Olivier
Edited by olivierth - Dec. 9, 2020 12:24:16
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