Archived post by profbetis

I’m having way too much fun with this thing lol. anyway here is the file. It uses some H22 stuff in there so you gotta be on that version

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004_bright_and_wild.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004_dark_and_spacey.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004_darker_and_spacier.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004_dawn.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004_city_yard.jpg
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260008/14/26/hou_stargaze2_v004.hiplc

Archived post by jim.meston

Updated Anisotropic Blur, added an anisotropy bias parm. By some coincidence if we blur P and uv at the same time we can get sliding topo with auto corrected UV’s. Passing the blurred point uv_temp.y to vertex uv.y gives us seam independent uv correction (in this case). This is just blur not ‘edge sliding’. Happy accident.

Though I’ve been focusing on position blur etc, i popped in some float bias and float bias decay controls which allow for flow advection type stuff directly from the modded attribute blur sop. Float bias accumulated min/avg/max and bias fade allows for accumulation and decay such that when there is strong anisotropy we can very controllably fade the contribution across the length of the blur. Interestingly (to me) while isotropic floor stabilizes some erratic behaviour with vectors like @P etc, it creates a convenient trail diffusion when used with floats. I meant that to happen, honest.

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20265508/05/26/sign_bias_uv.gif
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20265508/05/26/fade.gif

Archived post by mankara

Yes but it’s also really fun ☺️ Right now I’m fighting orientations after they have been surface or point deformed, to fit to anim 😅 Also tried GuideDeform but something broke there, have to investigate that further

Hello feather friends!
I found it very hard to find a simple technical setup for feathers, that just shows a simple case of a feather setup with deformation, which also works in Solaris. So I decided to make one and share it with you 😊
I hope it will help!

(tagging @dannylaursen @magnusim @janhebein cause you were interested in it 😊)

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20261108/02/26/feathers_technical_setup.mp4
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20261108/02/26/feather_technical_setup.hip

Archived post by zspc

I just improved the docs for my Optimal Transport HDA (CPU default but GPU acceleration using CuPy if you have an NVIDIA card), thought I’d share the link since I haven’t posted it here before! github.com/conlen-b/cb-houdini-tools/tree/main/sinkhorn-based-log-domain-optimal-transport
The repo also has the raw python scripts that I heavily documented while creating it so feel free to poke around there to learn how sinkhorn based log domain optimal transport works (or to point out things I can improve!)

I originally made it for my implementation of @jake rice 😮 ‘s awesome Raya Druun paper, when I made it I didn’t realize that he had already posted an optimal transport implementation on [his github](github.com/jakericedesigns/Assorted-Houdini-Demos/tree/main/OpenCL%20Optimal%20Transport) so I reinvented the wheel a little bit 😅 but with CuPy it’s nice and fast (and can support double precision, by default I set it to float precision though) and above all helped me learn a lot!

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20264107/30/26/OptimalTransportDemo_compressed.mp4

Archived post by bouncyferret

I did give flow + adjacency a stab earlier, but it’s not perfect. Might be good enough if the flow is not too chaotic. A better approach might be to have larger uv tile padding to give project non-divergent more area to solve (after adjacency sampling)
Flow block is cracked to do adjacency sampling, good luck 🙂

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260007/30/26/flow_adjacency_60fps.mp4
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20260007/30/26/adjquest_flow-block.hiplc

Archived post by mysterypancake

the second one has strange behavior when the line is thick, i tried to fix it but idk how 🙁

btw is it ok if i use this code for my opencl page? it might be a good example for aliasing behaviour

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20265607/29/26/image.png
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20265607/29/26/cops_graph.hiplc

Archived post by pdw9472

So – who else keeps their Geo Spreadsheet open by default? Ever ran into a situation where it actually slowed down Houdini?

Curious to know.

Just in case it hasn’t been mentioned yet – you can set the Geo Spreadsheet to give each attribute listed in the spreadsheet its own color now, which makes it very well readable:

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20262107/20/26/image.png

Archived post by zakkatara

Extrapolate boundaries combined with adjacency extrapolate gives you some actually seamless results when you are using triplanar in cops – below is in order no extrapolate, then just extrapolate boundaries (minor seam visible in normals), third only adjacency extrapolate (still some artifacts), and finally with extrapolate boundaries and adjacency extrapolate combined with no visible seam from normals or basecolor

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20263907/19/26/Screenshot_20260719_154729.png
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20263907/19/26/Screenshot_20260719_154757.png
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20263907/19/26/Screenshot_20260719_154854.png
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20263907/19/26/Screenshot_20260719_154816.png