/r/Houdini

Photograph via snooOG

The subreddit to discuss and learn about all things relating to the Visual Effects suite Houdini by Side Effects Software.

Welcome to /r/Houdini. This is a place to discuss, show-off and help each other with all things related to Houdini.

Useful Resources:

  1. Side Effects Software

  2. Houdini Doc / hou/python commands

  3. SideFX Official Tutorials search 'masterclass' ⭐⭐

  4. SideFX Forums

  5. Curated google doc Tutorial List ⭐⭐⭐

  6. Go Procedural!

  7. Odforce Forums

  8. Think Procedural Discord

  9. Matt Estela's cgwiki! ⭐⭐⭐

  10. Entagma's videos ⭐⭐⭐

  11. Houdini blueprints to share .hip recipes

  12. Peter Quint's Tutorials

  13. LesterBanks (cg related blog)

  14. CmiVFX Tutorials (non-free)

  15. Pluralsight/Digital Tutors Tutorials (non-free)

  16. To relax: pedohorse's Vimeo

Here are some other subreddits that you might be interested in:


/r/Houdini

50,100 Subscribers

1

Can anyone explain the code that he writes in the first six minutes? I've understood whatever he did in the previous part but this is the part where I can't understand how the interpolation works. Thanks!

0 Comments
2024/12/17
06:13 UTC

1

Help Learning Flip

https://preview.redd.it/h8us6rmokc7e1.png?width=2181&format=png&auto=webp&s=f5e80bc48e09ebac8c686f0f5f0ccd3430711c94

Anyone can help me recreate this or link material to where i can learn to do this in houdini i made this in blender a couple of months ago

1 Comment
2024/12/17
05:48 UTC

1

Need some confusion to be cleared regarding selling assets created with Houdini.

I know that you can sell .hda only if you are using commercial version. Only .hdnac file can be sold for indie users & it can only be opened by other Indie users.

Now as an Indie user I want to ask if I can sell .obj, or .FBX models created in houdini? Will that be a problem? WHat about procedural materials created in COPs, can I sell materials in image texture form?

2 Comments
2024/12/17
05:33 UTC

2

What's this weird snapping on flip fluids?

So i'm new to Houdini and I was following along with this tutorial and I found out that my fluid was snapping to the surface somehow? I tried the methods shown to stop volume loss but it kept snapping, can someone help?

https://reddit.com/link/1hfye5g/video/7e2dhctx1b7e1/player

1 Comment
2024/12/17
00:42 UTC

3

Houdini APEX test rig

Made a pretty cool rig using Apex in Houdini 20.5! Considering I'm not a rigger, this was a super fun challenge to dive into, and was surprisingly straight forward :)

video

https://reddit.com/link/1hfvnc9/video/w4iqhu2pfa7e1/player

0 Comments
2024/12/16
22:35 UTC

4

The Sweep SOP

0 Comments
2024/12/16
17:18 UTC

4

Editing a scene while seing the Karma XPU rendered viewport ?

Hello everyone!

As a long time Blender user, I'm now getting more comfortable with Houdini's advanced sims/procedural features, but I still feel like I'm missing some very simple elements...

For example, I build my scene in the obj context, and then import my different elements in Solaris, where I create and apply materials, lights, etc. But what if I want to edit a shot while I look at the finished lit up scene ? Currently, I know no way of doing this, I have to look in solaris, then switch back to obj, make the change without seeing its impact on the scene, go back to solaris, test the render view, etc. That seems absurdly complex (at least coming from Blender), am I missing something ?

Thank you !

7 Comments
2024/12/16
16:29 UTC

120

Thin FEM development log

11 Comments
2024/12/16
16:05 UTC

1

Apex FK and IK control swap

I was trying to figure out a way to set up Apex rig controls where an animator could deliberately choose between fk and ik controls in the middle of animation.

I am considering to make two guides that are parented to the actual joint (one for ik control and another for fk), so that maybe instead of switching they just both exist and update each other simultaneously. Not sure what is the better way.

Is there any material or documentation that I could look up something like that?

0 Comments
2024/12/16
15:01 UTC

1

Cant get Laplacian to work in vdb analys

Hey,

I am exploring the vdb analysis nodes and been playing around with vdb advection. I had some interesting results but I wonder how I get the laplacian to work and bind them correctly.

I keep getting this error:

https://preview.redd.it/l9ckatbi587e1.png?width=1437&format=png&auto=webp&s=2d519468a82c1f1079d04944b524f155a701d8da

This is the vob setup I am using:

https://preview.redd.it/ovq8b6km587e1.png?width=1062&format=png&auto=webp&s=51adc7c93f4fc56b7cc905279cadd28ca1f920da

Anyone has an idea what how to make it work?

Thanks!

2 Comments
2024/12/16
14:56 UTC

2

Struggling to setup a procedural ring spin animation

This is what I have so far.

Problem #1 : When moving the roll height, the ring slides along the ground when I want the pivot point to stay in place.

Problem #2 : When moving the roll rotation, the whole ring spins about the Y axis when again, I want the contact point with the ground to move along the ring, as it would in real life.

Any ideas how to make this work? I tried turning the bottom of the ring into a curve with a carve, then deleting all but the last point that moves along that curve, and using its P to feed the pivot transform but couldn't get it to work. Thanks

1 Comment
2024/12/16
13:09 UTC

1

Stylized vellum sim?!

Hey everyone,

I recently accepted a project as a cloth sim artist, and I’m facing a bit of a challenge. The client wants the simulations to be as stylized as possible—big folds, no small details, very clean.

I know there are two key things to achieve this:

  1. A mesh with a lower poly count
  2. Increasing the bend stiffness value

Is there anything else I should focus on to improve the results and get closer to their desired look?

P.S.: They want the style to resemble the cloth simulations in the animation Luca.

3 Comments
2024/12/16
06:48 UTC

1

rbd material fracture node not working

I had a blue tint bug on karma xpu, so i rolled back my gpu drivers but now the rbd material fracture node doesnt work, it says this on the houdini console: "OpenCL Exception: ptxas application ptx input, line 9; fatal : Unsupported .version 8.6; current version is '8.5' clBuildProgram (-9999)". I currently have 560.81 driver version installed, blue tint appears on higher versions. is there a way to fix this issue.

2 Comments
2024/12/15
20:24 UTC

176

Some procedural animations and simulations!

9 Comments
2024/12/15
17:25 UTC

10

HOUDINI [paid] TUTORIAL | Houdini 20.5 USD Asset Generation With Tops

0 Comments
2024/12/15
17:15 UTC

96

Combining algos

Differential line growth/paint drop marbling

3 Comments
2024/12/15
16:41 UTC

2

Trouble understanding quasistatic vellum simulation

Hello.

I am messing with vellum cloth and was wondering if there was a way to alternate some settings in the vellum node and see the result on one frame like f53 for example without running the whole simulation. I tried time shifts but they need to run the simulation to refresh

I checked online and saw someone mention quasistatic vellum simulations that seemed to do the job but I'm having some issues making it work.

https://preview.redd.it/5gcdnh5pp07e1.png?width=732&format=png&auto=webp&s=e75a627b8b6f226ab619b5872889b2eeabfda3c2

https://preview.redd.it/77vngg5pp07e1.png?width=1557&format=png&auto=webp&s=e4a064723825d51bd245d2968295d697fe177b9e

Is it a viable solution and, if so, am I doing something wrong?

The first image is a dynamic simulation type and the second quasistatic

Thanks!

6 Comments
2024/12/15
13:55 UTC

0

facing this issues

while meshing suddenly other geo appers from no where

https://reddit.com/link/1henypz/video/o2b6svtdyy6e1/player

1 Comment
2024/12/15
07:59 UTC

0

Houdini Crowd Sim to Unreal

Hey Guys, I was trying to export Crowd Sim From Houdini to Unreal but all I'm getting is static mesh. can anyone tell me what could be the issue?

5 Comments
2024/12/15
06:22 UTC

2

UV layout on mass with for loops?

I have an object file from maya which is already organised into groups/primatives, there's alot of objects so I just want to UV flatten and UV layout them onto different udims based on their maya group names.

I'm pretty sure this can be kind of automated but right now I don't know what I'm doing wrong.

The manual approach that works is File node - Load OBJ - load all geo Blast node - type in wild card such as "objectsA_grp" - Delete no selected. Then uv flatten -- UV layout - change udim setting and move it.

I'm pretty sure there is a way to use "for loops" to grab objects of different names /grouping and lay them out on different udims but nothing works.... The "for loop" dosnt pickup the attributes even when using a connectivity node...

Any ideas?

I can export other formats if it's easier to work with, I tested with obj but maybe fbx or alembic is better?..

7 Comments
2024/12/15
04:25 UTC

2

How to trigger python only when keyframes on a specific parameter are set or modified?

I have a HDA with a parameter with some keyframes set. I also have a python function in my HDA's PythonModule that I want to call only when the keyframes on that specific parameter are modified or new keyframes are created on it or deleted by the user.

I've messed around with callback events but I'm just getting confused at this point due to UI interaction behavior and all sorts.

I've also tried just sticking python directly into another parameter's expression to get it to run every frame and check what I'm doing but this is obviously just bad for many reasons.

What's the easy way to do this? Apologies if the question/context is confusing.

2 Comments
2024/12/15
04:02 UTC

1

Remove unnecessary houdini dots from the polygon keep edges

The question is when we project a Voronoi texture on a curved surface, we would like to remove all unnecessary points except the Voronoi polygon so that the polygon is clean

https://preview.redd.it/cnlxqornau6e1.png?width=1640&format=png&auto=webp&s=e86351a859cb1393e141fa0abed25a5ce5013964

17 Comments
2024/12/14
16:19 UTC

117

Olivada - satisfying Houdini magic

A personal project I did a while ago - inspired by a dish I had in a restaurant - what do you guys think? (:

11 Comments
2024/12/14
11:18 UTC

315

My first flowers made with Houdini

6 Comments
2024/12/14
09:46 UTC

210

Whispers of the Wind

Happy to share this project i did back in October.

All done in Houdini, KarmaXPU and Nuke.

26 Comments
2024/12/14
07:11 UTC

4

How do I add custom velocities to make FLIP sim move the way I want?

Hey guys, I'm trying to animate a boat going in the water but my flip sim just creates space in the water for the boat and a few displacements around the boat. It looks realistic but isn't too visually impressive.

I'd like to add a few small waves being pushed from the side of the boat like in this video.How would I go about achieving it ?

I know how to do basic flip sims but I can't find a tutorial for this kind of effect.

3 Comments
2024/12/14
03:05 UTC

Back To Top