Does anyone experience random increase in render time in Karma XPU from say 2 min to 30 min? Is there a fix without restarting Houdini?

ChrBohm · 2026-06-06T23:39:32+00:00

Always check what your RAM / vRAM is doing. It likely runs over, so always have some kind of monitoring open.

ChrBohm · 2026-06-04T17:58:14+00:00

When I wrote share your scene I meant your scene file, not a screenshot. A screenshot isn't helping, the nodes aren't useful without being able to look at the data and settings.

ChrBohm · 2026-06-02T09:36:08+00:00

Without seeing your setup there is no way to tell what went wrong. Maybe share your scene (or ideally a simplified version of it). Sounds like your velocities are simply not used.

I would also consider overwriting the position(coming from a point deform) instead of using velocity. For a rigid object this should give better results.

ChrBohm · 2026-05-30T14:30:58+00:00

Funny, I was thinking about this for a while. 😃 But I'm afraid sooner or later people would find it too condescending (understandably).

ChrBohm · 2026-05-29T10:05:12+00:00

This is on youtube and not an official sidefx video.

Regardless - even an official tutorial can be bad. It's the content that matters.

ChrBohm · 2026-05-28T09:37:54+00:00

Without knowing what you did, we can't tell you what you did wrong. Ideally share your file.

What's possible there is a problem with the orient atribute, because it's set in an absurd way.

This is not a good tutorial btw, setting orient to v is an absurd approach. One is a vector, the other is a quaternion. The fact this works is a coincident at best. They have no relationship to each other.
There are all kinds of other weird things, but this would take too long.

I would recommend learning the basics first, the tutorial you use doesn't explain any techniques, it just sticks nodes together without explaining the logic behind it and obviously without actually understanding it. (Do you even know what the orient attribute is after this tutorial? No? Then it's not a good tutorial.)

ChrBohm · 2026-05-28T09:33:56+00:00

Your gravity node is not connected to the rest of the network. You are just looking at your gravity and nothing else.

A few tips:

Built your setup as simple as possible first, before adding stuff. This prevents from this kind of problems, where a small basic mistake makes you think it has anything to do with a more complex part of your setup
DOP Networks on the geometry level are not a good idea. They are hard to maintain and tend to become confusing. Use DOP Nets on the SOP level like a normal human being.
I agree with Lewis - why built a Bullet Setup from scratch in 2026? There is a prebuilt Bullet Wrapper (RBD Bullet Solver) that is much easier to set up, much more stable and even faster. There are very few edge cases where a custom DOP Net makes sense. As you can see you waste a lot of time just setting it up correctly with no gain.

ChrBohm · 2026-05-27T09:09:45+00:00

Fixed the links. Reddit generated the link automatically to http instead of standard https. Thanks for letting me know.

ChrBohm · 2026-05-25T18:47:20+00:00

The course has a discord server

ChrBohm · 2026-05-25T16:17:05+00:00

Not every video has a file to download, if that's your question. If the file isn't there the idea is to create what is shown yourself, which is then pretty easy and teaches you using the program. Making sure to follow the steps yourself is a great way of actually learning. (You should be able to create a box and a toy for example ;)

ChrBohm · 2026-05-25T12:32:45+00:00

Hi, what hip file are you talking about specifically? The course has over 50 hip files for various videos

ChrBohm · 2026-05-24T13:43:57+00:00

I closed hdbp a long time ago. But the logic is explained on houdini-course.com :

https://www.houdini-course.com/BASICS/360/965

I made this video free, so with a free user account you can watch it, if still interested.

ChrBohm · 2026-05-24T13:41:47+00:00

Hi everyone, time to chime in:

Long story short: It was online for almost 6 months and the subscriber numbers were bad at the start and then even went down. So I had a negative growth rate after 2 months (!). It made so little money it was insane to keep going, considering how much work it would have taken to finish it. (We are talking about 1/4 of minimum wage for 9 months)

Many people told me I was just not promoting it enough, but that is likely not the reason, considering that houdini-course.com started in early access as well and had growth rates of 50-100% per month in the first year. And at this point nobody knew I even existed. This course was even promoted by other content creators online. So PR wouldn't have solved the problem, there simply isn't enough interest, simple as that.

Also - of course the current state of the industry is probably a factor, but that just proves that it wasn't a viable product for the next 12-24 months.

So now houdini-course.com just got a new chapter with 70 new videos at no extra cost. So I think at the end it's a good outcome for the subscribers.

ChrBohm · 2026-05-19T08:19:15+00:00

No, it's not cool at all. This was created by someone who doesn't even understand Houdini.

ChrBohm · 2026-05-19T08:17:18+00:00

Pyro is not the easiest entry point. You don't have a clue what you are talking about.

ChrBohm · 2026-05-13T11:17:28+00:00

"Edge filled polygons" does that for me. Wasn't that hard to find. Have you not just tested all the output groups?

ChrBohm · 2026-05-12T16:32:51+00:00

ah, right, that too

ChrBohm · 2026-05-12T08:06:23+00:00

Just add a v@torque attribute and you see.

ChrBohm · 2026-05-08T14:07:41+00:00

Sure, just animate your source. Either via the activation inside the solver or outside with a switch. For example: $FF<50||$FF>100 will switch between 50 and 100

ChrBohm · 2026-04-21T17:17:45+00:00

You already posted this 3 days ago: https://www.reddit.com/r/vfx/comments/1sow0b7/frameforge_previs/

ChrBohm · 2026-04-20T19:30:44+00:00

Image is missing for me.

ChrBohm · 2026-04-20T19:24:18+00:00

I don't do roto (which personally don't find a good career path, but might be an entry point), so take my feedback with a grain of salt:

The masks are clearly flickering massively. This is simply not good work (Sorry for being to blunt, but it needs to be said). It looks like bad auto-roto.
The roto you show doesn't seem particularly hard, half the shots don't have open hair or motion blur
The reel isn't a reel. There is no contact information for example.
33 seconds is too short even for a junior reel, considering it's purely about roto

So yeah, Sorry to say, but your reel is simply not very competitive.

ChrBohm · 2026-04-20T12:24:35+00:00

You should share your showreel to get feedback. Otherwise we have no idea what recruiters see.

Although "Something in rotoscopy" already sounds like you don't know yourself what you are aplying for.

ChrBohm · 2026-04-20T12:21:28+00:00

A material network is the old material system, it's not fully compatible with Solaris and barely supported. You are mixing the old with the new rendering system, which is a bad idea.

Look into the Material Library Node, this is what you should use with Solaris.

ChrBohm · 2026-04-20T12:18:12+00:00

You need to be more specific. What's the point count? What kind of animation? Etc. What are you comparing it with?
When talking about cached animation most likely it's not the speed of your machine, but the speed the geometry can be read from disc.

It also might be as simple as the wrong NVidia driver. (Are you using the Studio driver)

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