Very cool stuff! Thanks for the writeup :)
How does it compare to hsv blending?

The PCA Dejitter tutorial & files can be found here:

www.sidefx.com/tutorials/pc...
www.sidefx.com/contentlibra...

The ML Groom Deformer tutorial & files can be found here:

www.sidefx.com/tutorials/ml...
www.sidefx.com/contentlibra...

The ML Sketching tutorial & files can be found here:

www.sidefx.com/tutorials/ml...
www.sidefx.com/contentlibra...

If you just want to get a broad overview on what to expect you can also take a look at the presentation I gave during last year's Houdini HIVE Horizon event as well.

Haha „scan“ is a good word for it!
Building something digital that is so inefficient that it feels analog 💀

Cheers :) Yes definitely!
Originally I wanted to build the whole thing in cops only to find out, there is no such thing as time yet :D

Thanks! It's a fun effect for sure .. it gets carried by @gurmoose.bsky.social 's sick RBD work though!

Based on that attribute you can shift UVs to read from different udims (frames) at the same time.

COPs really came in handy to rasterize the final point colors and enabled a faster round trip time.

I wrote a little bit about the setup here:
fxnotes.xyz/notes/Slit-Scanning/

On videos this effect is really trippy as it let's you see the past and the future in the same frame. In this case you can see the impact before it actually happens.

In essence the Houdini setup allows you to timeshift per pixel and let's you control it using a single attribute.