World UV on packed prims

[Jim Meston]

Hi,

I am trying to apply some variation to some edge roundness shader and want to use world space noise but locked to the packed prims.
Obviously Object UV's works as expected and textures lock to the object and obviously World UV's work as expected and objects move through the noise, but I need the world space noise to work of a rest position or frame 1 or something.

Any clues?

Many thanks.
Jim

[chakarov]

Hello Jim Meston , check this if it helps. I've created a similar to your scene with a possible solution.
box without uv, packed and copied to points and than animated. Split the flow and with TimeShiftSOP freeze one part to first frame and generate rest attribute, than transfer it to animated flow with point wrangle.


in mat network I've created an UVWGenObject node to generate uvs in object space, then convert generated uvs to a color and by adding it to rest attribute also as a color i can shift them in space. There is a multiplier node so you can scale the tiling. ImageFile uses explicit uvs.



video: https://drive.google.com/file/d/1688...ew?usp=sharing

[chakarov]

and this is a even better solution, first I set uv from vertex position before copying, than I use this attribute in material instead of UVWGenObject.

[Jim Meston]

Thank you for this. I tried initially to get @P directly into a user color but it wasn't working for some reason. This is great, thank you very much.
I have another simple shader question but will open another topic (if I can't find it in the search).

[chakarov]

@P is not exported as an object attribute that's why it wasn't working.

[Jim Meston]

Makes sense. Thank you very much.