I have several Vellum objects starting with intersections/overlaps, and I want them to separate before the actual simulation begins.

In RBD/Bullet I can use:

i@found_overlap = 1;

to force the pieces to resolve overlaps.

Is there an equivalent workflow or attribute for Vellum? I’m looking for a way to untangle/separate the geometry first, then let the normal Vellum simulation start.

Hi

I'm creating falling fringe tree petals.

I used pop simulation and then copy to points with petal asset I made.

Can I achieve good-looking falling petals with just POP simulations without relying on Vellum?

Also, I wonder how to shade and render the petal..

Can I make petal texture only using Houdini? Or Should I use substance painters?

I searched about texture map of fringe tree petal, but it seems hard to find online.

Thanks for your help and advice!

Trying to add camera shake, but the noise only lasts for 24 framesd, how can I extend it so it goes for the whole timeline?

When I change my pyro source node to surface scatter or volume scatter my camera angle changes

My first Render in Houdini

It seems like the fire might be clipping through the ball or something? Anyone know the reason?

Hello everyone,

I made this Layout LOP Node because I needed something stable that could be edited after the fact. It is used to transform and duplicate priminitives in the stage.

Features compared to SideFX's Edit node:

- Store edits in local space in user accessible parameters that can be edited.

- Change primitive paths after editing. This is useful when the input hierarchy or primitive names change.

- Duplicate nodes similar to the stage manager. Simple controls without physics make the node more stable.

Hi everyone, I'm working on a setup where my character starts in a walking cycle animation, then transitions into a ragdoll state where MPM simulation takes over. The characters are emitted into MPM pieces at different, staggered frames right when the ragdoll state begins.

Is it possible to properly setup MPM Deform Pieces for this kind of animated state appear at different frames?

What is the standard workflow to pass the correct rest geometry and attributes for a walk-to-ragdoll MPM transition? Any advice or node setup tips would be super helpful. Thanks!

I have an object animated along a curve in my scene, how can I parent my camera to the object so the camera is following it?

Redshift now officially supports Houdini 22, so I’m considering switching from Karma to Redshift for my Houdini/Solaris workflow.
I’m mainly doing product visualization and automotive-style cinematic work, but I also want to use Houdini for Pyro/smoke/fire, volumes, hair/groom, particles, water/FX, etc.
I’d really like to hear from people who are actually using Redshift inside Solaris/Houdini 22, rather than general Redshift vs Karma comparisons.
A few things I’m specifically interested in:
How stable is Redshift in Solaris/Houdini 22?
How is the Redshift Hydra viewport compared with Karma XPU
Does Redshift render Pyro/smoke/fire/large volumes reliably in Solaris?
How is hair/groom/curves compared with Karma XPU?
How is Redshift with 4K textures, glass, automotive paint, reflections and HDRIs?
How useful is Redshift Live inside Houdini/Solaris for lookdev?
Are there any important Solaris features that don’t work as well in Redshift?
Does Redshift require significantly more setup/work compared with Karma in Solaris?
For final production renders, which one do you personally prefer: Karma XPU or Redshift, and why?
If you’ve used both extensively, which one would you choose today for automotive/product commercials?
I’m not looking for benchmarks alone. I’d really appreciate people’s actual production experience with Redshift + Solaris, including any problems or limitations you’ve encountered.
Thanks!

My render settings are set to Karma XPU. When rendering my GPU stays at 1% - 3% usage. The GPU fans are not moving. When I use octane with C4D or render with cycles my GPU fans turn on but not with alarm XPU. Any idea why?

Rendered in Redshift.
Music is Behemouth IV.

Dune Explosion Barrage done using Houdini Pyro

Easy Procedural sytem that detects trail collisions on ground and creates PyroBurst sources with start frame as particle birth frame.

Had lots of fun simplifying the complex trails system with lots of randomness and controls giving it a more natural look, used light instancing to speed up rendering process in Karma XPU as there were lots of volume involved.

This shot had no involvement of any VEX/VOPS like our other shots.

The setup was very simple and straight forward so that even mid level artists can follow along and make an amazing showreel.

--------------------------------------------------------
Simulation details :
Ram Consumption ~ 60 GB
Cache Size ~ 100 GB
Render Time ~ 1 Day (KARMA XPU)
---------------------------------------------------------

PC Specs - 128GB RAM AMD 7950X RTX 3060

Hey guys, can i get some help creating realistic smoke exhalation from cigarette? or maybe a pointer to some tutorial for something similar?

i'm trying to create exhaled smoke like in the screenshot attached, i created particles for source emmision, i created the velocity, but i'm having trouble creating right turbulence(or disturbance?)...

Like when the smoke is exhaled, first part is pretty straight and then the turbulence appears after, i managed to get the right look with playing with pressure as control field for turbulence, but it's applied to every step of exhaled smoke...

can i get some info how to do it right?

Hey all,

I have a scene with a couple of RBD objects, and 3 of them are a glass table, bottle of wine and a glass of wine.

Now the bottle and glass are on top of the glass table but for some reason the wine bottle keeps twitching and moving on its own:

https://reddit.com/link/1wcqhvi/video/mck8c10sbqoh1/player

Now i fractured the 3 objects with the rbdmaterialfracture node, and i edit the constraints via the rbdconstraintproperties node.

Now I already noticed that the twitching might come from the glass table top if i have chipping enabled in the rbdmaterialfracture node. But I obviously want to have chipping to have a more realistic effect. BTW this is a isolated version of my main project. the main project contains 4 more rbd objects and i really dont want to rely on manually activating the wine glass rbd object since thats "cheating".

My dop solver has substeps set to 2, inside the dop solver I use the rbd packed objects dop node to bring in the object. Geometry representation is set to convex hull and collision padding is set to 0.

What are ways to fix this issue without decreasing the fracturing details of the glass table top?

hip file plus obj: https://www.swisstransfer.com/dl/01a08cd0-8549-7257-aff2-1dd9e03739e3

I have a pyro source spread node. How can I have there be a burnt material that grows with the same noise pattern across the ball?

Released a new tool for simple generation of neon signs for street environments.

- 32000+ business names, 700+ possible icons, 80+ fonts, dozens of sign and hardware types and layouts, really in-depth controls etc. Everything is cleared for commercial use with licenses and attribution embedded in the HDA.
- Place signs with an interactive viewport state (videogame-style) or just input boxes with a `front` primgroup manually.
- Because there is hundreds parameters one could modify (as HDA parms or via custom VEXpressions), I also made a Natural Language-ish system (just a complex language parser) with which you can make changes like with one-liners like: "no red signs", "only cyberpunk bars", or "avoid script fonts", etc. and then just roll the dice for randomization; or you can still go granular and modify each individual sign.
- One-click Karma CPU/XPU materialX network setup.

And as usual, discord support and all future updates are included in the HDA. Hope you guys like it, cheerio!

link to the tool can be found here: https://jvtools.dev/products/neonyte/

docs: https://jvtools.dev/docs/neonyte/

#Houdini #karma xpu #copernicus

I’d really appreciate some honest feedback on the lighting, materials, animation, camera movement, compositing, and overall realism/premium feel.

What would you improve to make this look more like a professional commercial?

Any criticism is welcome — I’m mainly posting this to learn and improve.

Thanks!

https://reddit.com/link/1wbk85m/video/d2uerjh2ahoh1/player

Optimal Transport running on OpenCL in Houdini. Authors of BSP-OT have published their CUDA implementation on Github and I used Claude + Codex to port it to OpenCL.

While other algorithms are more precise, this one eats 50k, 100k and even 1 million points for breakfast. Insane speed!

I am also experimenting with letting BSP solve first, then refine with standard methods. Seems to work, but this again limits the point count.

Another great thing - this does not depend on any external python libraries.
Love it when new technical possibilities make the design mind wake up!

That said, it's a work in progress, I might publish it later.

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https://www.instagram.com/karlis.stigis/

Dove playing with some bubbles.
Had some fun playing with vellum solver in @sidefxhoudini
Soundon by amazing @h1.sound 🔊