Attribute Transfer

[akiko_yamashita]

I would like to do Attribute Transfer like Houdini.

What I want to do is to use incoming SOP’s primitive center to sample an image and output to point Cd. (Like mosaic effect, in C4D this can be done by use fracture node then colorShader)
I know it can be done in instancing using w but in my case, the incoming SOP won’t be a grid but randomized grids with various primitive sizes.

I attached a sample scene file. I read on the forum that Script SOP can be used to transfer prim attribute to point attribute.

My guess is to transfer primCd to either point Cd or point UV.

I couldn’t figure out how to use script SOP myself. If anybody has suggestion I really appreciate your help!
attribTransfer.1.toe (4.21 KB)

[akiko_yamashita]

Actually Attribute Promote I meant.

[nettoyeur]

here’s an example of Attribute Promote

Attribute Promote

This is another one stolen from Houdini land. This lets you promote attributes between different types of geo. At the moment, it’s fairly limited, and only lets you promote color from points to primitives. Also, all the primitives are assumed to be connected to 4 vertices. It runs through glsl, so it should be pretty speedy. Attribute_Promote-v1.tox (3.31 KB) [Attribute_Promote.jpg]

and here an example of Attribute Transfer

Attribute Transfer

Here is an early making an Attribute Transfer SOP. For those that aren’t familiar with Houdini, this lets you transfer an attribute from one sop to another based on distance. In this limited example, this is hard coded to color transfer, although you can adjust the distance threshold, as well as a blend distance. At it’s base, this works by way of a glsl shader, so the input geometry can’t have more than 32,768 points, although my guess is it would start slowing down long before you got there. …

[akiko_yamashita]

Thank you Idzard! I saw the links but that can transfer from points to primitive, and not the other way around. Lmk if there are still ways to do it.