Coming from this one https://www.sidefx.com/forum/topic/51410/ [www.sidefx.com] so I don't hijack my own thread.

I got lucky because I could get the world position from the uvs. In the case of an arbitrary mesh I'd make a grid if points in world space that represent the pixels, do the tricks in sops and then bring the colors to cops.

excellent example!!!!
thank you for this

best regards
Patar

Thanks! You're welcome

Thanks for taking the time to do that example. I hope you agree that there are some Houdini improvements that would make this ‘type’ of effect easier.

#1 - COP Wrangle node with OCIO VEX functions
#2 - SOP Import Grid Points node (to ensure a 2d plane of points)

OCIO Vex funtions, I'm sure that'd be cool, although for this specific example I don't imagine how they could be helpful, it might be because I haven't had the time or need to get around all the OCIO business.

#2. I'm not sure how that node would work. Look at the cop globals, we need a logic to import data. The most useful are the X and Y positions, analogous to u and v or s and t. So we need to find a correlation between that and world ( object ) space. So what I've done a couple of times before is transform the mesh to uv space and sample attributes from that geometry ( forget the pixel grid I talked about, I got confused with a related experiment ). Of course it needs to have properly laid out uvs.

I'm sorry I couldn't agree more, I'm just trying to be sincere AND constructive at the same time.

Toodles!!!

The copnet sop does create a mesh with color from the image.

jsmack
The copnet sop does create a mesh with color from the image.

I'm sure you misinterpreted. If not, maybe a hip file ?

Hey, this example works great if the grid only has 1 primitive because you're specifying prim 0 in cops. I can't wrap my head around how to make this work for a more complex geometry with multiple primitives. Any idea?

Colby Winfield
Hey, this example works great if the grid only has 1 primitive because you're specifying prim 0 in cops. I can't wrap my head around how to make this work for a more complex geometry with multiple primitives. Any idea?

I just noticed your post … Check updated scene.

thanks for sharing!i am looking for something similar but much simpler.
i just have a circle resampled with point color and i want to bring that into cops for processing.

The Geometry node just brings the projected circle white without any color information which is a bummer