How can I transfer UV from polygon to volume, and vice versa (after deformation)?

[Masoud]

Hi;

I would like to create a VDB from a polygon (that contains UV texture) and after some deformations (like anti-alias noise), I would like to convert it back to polygon.

I tried to transfer UV attribute from volume to deformed polygon by turning the "Transfer Surface Attribut" option ON, in "ConvertVDB SOP", but it doesn't work in some parts of the final result.

 

 

Thanks for helping.

uv_Volume.hip

Edited March 12, 2020 by Masoud

[rbesca]

hey, I'm no expert on this and I'm not entirely sure if this approach makes sense in your case so take this with a bowl of salt. but I think the vertex split destroys some needed information? if you unwrap after converting vdb to poly everything has uvs. this might be missing the point of everything you did before that though 

 

Edited March 12, 2020 by rbesca

[rbesca]

also just got this funky thing using attr from volume node. not too sure what I'm doing exactly but looks a bit closer to desired result ¯\_(ツ)_/¯

[flcc]

I don't know why in your setup the transfer only works partially, but you can effectively use an attribute from Volume.
You just have to be careful that when in your vdbFromPolygon, to host your uv, you create a second VDB.
For attributeFromVolume to use the right VDB, you have to delete the VDB density. (Just call @name=uv group in the attributeFromVolume don't work for me).
However, on the edges, it's not perfect.

I'm also not sure what the proper procedure is.

 

uv_Volume_F.hip

 

Edited March 12, 2020 by flcc