Singularity in Computing Curvature for Heighfield

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Im using a volume wrangle to computer curvature for my heightfield and like the Sidefx node, im getting

Both solution are uncorrect, so my question, is it possible to solve the equation for compute curvature for a 2d volume?

First pic is sidefx method, second mine, third and last are custom but i have to get out volume2d to compute...

Cheers!
Edited by vinyvince - Oct. 29, 2023 12:46:00

Attachments:
curvaturevolume_vince.JPG (248.2 KB)
curvaturevolume_vince3.JPG (141.0 KB)
curvaturevolume_vince4.JPG (135.0 KB)

Vincent Thomas   (VFX and Art since 1998)
Senior Env and Lighting  artist & Houdini generalist & Creative Concepts
http://fr.linkedin.com/in/vincentthomas [fr.linkedin.com]
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