How to paint to a splat map using Shader Graph?

Hi all, i've got texture UV coordinates from a raycast at mouse position, but am finding it difficult to take those UV coords and paint to a texture (splatmap?) using Shader Graph. Has anyone achieved this in Shader Graph that could point in the right direction?

Thanks in advance!

Tim

 

Looking for the same thing

 

@revybeast I later posted this https://forum.unity.com/threads/need-help-painting-to-splat-map.678604/

I was able to get it working using Unity's Custom Render Texture. I posted a link to the project on github (it's using Universal Render Pipeline). Others have commented a bunch of stuff including different issues between URP and HDRP.