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Found 14528 posts.

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Houdini Indie and Apprentice » wired vex compiling problem on mac?

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shengsword
1 posts
Offline
 March 25, 2023 11:35:20
I got an wired error on vellum cloth sop now, and I have test on different houdini, same problem.
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Technical Discussion » HoudiniEngine in Unity - HeightFields scatter attributes

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JanKrocak
5 posts
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 March 25, 2023 10:18:52
Hello, I would like to ask about the attributes needed to control Tree instances in Unity. Based on the documentation I defined 'unity_hf_tree_prototype' point attribute as well as 'unity_hf_treeinstance_prototypeindex' attribute which works (see the image from Unity) but when I try to use pscale and orient attributes to drive orientation and scale of these scattered objects it doesn't seem to react in Unity at all. Would you have any idea why please? In Houdini seems to work as intended (see image from Houdini).
Thank you in advance for any advice!
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Houdini Lounge » [Character Animation Workflow] Shift-Right Click Frame Jump

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nicholasralabate
162 posts
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 March 24, 2023 15:12:16
Hi! Another (!) Animation Editor question for you all. I noticed that on the Animation Editor timeline I can Shift-Right Click to jump between the two most recent frames. This is really cool! Unfortunately it only works on the Animation Editor timeline and not the main Houdini timeline. Are there any other ways to navigate like this? Alternatively, is there a way to hotkey this behavior? I didn't see anything in the Hotkey Editor that matched up to this feature.

It is handy because sometimes I want to jump between poses that are many many many key frames away, so Ctrl+Arrow isn't as useful.


Thanks!
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Technical Discussion » Make trails affect by source geometry scaling?

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proceduralist
208 posts
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 March 24, 2023 06:32:55
I'm trying to create trails that get affected by the size of the spiral. But they aren't getting affected at all. Please suggest a solution.


I am following this tutorial.


Moreover, the tutor is able to make the particles bounce around a single path. But that's not happening in my case. I'm not able to figure out why.
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3rd Party » My First HDA

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getuffassassin11
11 posts
Offline
 March 24, 2023 04:43:04
Hi *,

Thank you all so much for the incredible knowledge you all share freely on here. I am coming from Unereal's Geometry Script for proceduralism into the world of Houdini. I decide to make this tool to bookmark my progress in learning so far. Please find a detailed breakdown here. I would be happy with any feedback or comments you might have. https://hakeemadam.info/procedural-tools [hakeemadam.info] . Thank you.

Procedural Tools [hakeemadam.info]
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Technical Discussion » How to pass a texture to an OpenCL kernel?

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localstarlight
58 posts
Offline
 March 23, 2023 18:28:36
I would like to pass a texture into an OpenCL kernel so I can use them as lookup tables for some operations, but I can’t figure out how to do it.

Theoretically, I could turn the texture into a volume/vdb I guess, but I just want to know if there is a proper way to do it.

Anyone have any experience in this? OpenCL in Houdini seems to be one of the lesser-documented things at the moment…
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Houdini Indie and Apprentice » Problems satting up costum shelv/ tool in $HSITE/toolbar/*

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nicolaas.tanghe
44 posts
Offline
 March 23, 2023 18:13:28
Hello I`ve been trying to set up a costum shelve in houdini but i keep being umable to load it at startup.

I have tried setting HOUDINI_TOOLBAR_PATH using a package but when i try to echo it from the textconsole it returns blank.
My file looks like this.
{
"HOUDINI_TOOLBAR_PATH" :
[
{
"value" : "$HSITE/toolbar",
"method" : "append"
}
]
}
The error i get in Houdini after launch is
cannot find the definition of the shelf Homebrew.

If i export HOUDINI_TOOLBAR_PATH= "$HSITE/toolbar"

Then I get the error cannot find the definition if 'the shelf_set_1' requested by the current desktop.


anny help is verry apreciated, THX in advance !
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Technical Discussion » Labs Mesh Sharpen

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Geoff Marshall
17 posts
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 March 23, 2023 15:55:07
I was watching a video on Labs mesh sharpen from 2019 in houdini 18.5 and yet I don't see the node in 18.5 or 19.0. What's up with that? Is it only in 19.5? https://www.youtube.com/watch?v=eRNYZgIitOQ&t=75s [www.youtube.com]
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Houdini Lounge » [Character Animation Workflow] Filter by "is Animated"

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nicholasralabate
162 posts
Offline
 March 23, 2023 14:07:04
Hey gang, Animation Editor question!

I know you can pop open an Animation Editor with ONLY the animated channels on a node by highlighting the node and hitting the "V" button. But is this possible any other way? Say, for example, I have a list of 200 channels in the Animation Editor. Some channels have animation data, some do not. Is there any way to filter out the channel list so it only shows me channels with animation data? As far as I can tell, the only filters are the rot/trans/scale buttons at the bottom and the text field for regex of channel names.

Thanks!
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3rd Party » Installing Quadremesher exoside on Mac

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lisamoren
1 posts
Offline
 March 23, 2023 10:33:44
Does anyone know how to install quadremesher exoside on a mac? It keeps crashing. I've downloaded it, but I'm a newbie and having issues figuring out the path to get accessable to the "new asset" menu.
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Technical Discussion » Using Runge-kutta (Gas Integrator)

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daveofx
1 posts
Offline
 March 23, 2023 10:27:17
Hi everyone, I've been looking for an answer online but can't find much written about this so I thought I'd ask the experts here!

I've been trying to simulate a particle spiralling around a force field by adding a force that's the cross product of the particle velocity and the field. The circle it makes gets progressively bigger though.

I've told this is probably the solver method, with Euler not being precise enough where there is a force changing between time steps.

So I'm trying to change the gas integrator inside the POP solver to one of the Runge-Kutta options but it's not updating the particle positions when I do this. I can see in the spreadsheet that it's calculating the force and velocity ok but the particle won't move.

Am I missing something obvious here??

Image Not Found

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Houdini Lounge » Houdini and chatGPT

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Dark_Ego
3 posts
Offline
 March 23, 2023 03:19:23
I was checking out chatGPT, asking it to do different things like create a meal using foods found in the wild. Write a python script to find duplicate files on a hard drive and other things when I got the idea to have it create a scene in houdini using python. I gave it this prompt:

write a hython script that generates 20 cubes in random locations in sidefx houdini

This is what it gave me

In Houdini, Python scripts can be executed through the Python Source Editor or saved as a Python module. Below is a Python script that creates 20 cubes (boxes) with random locations in Houdini using the Houdini Python API (Hython):
import hou
import random

# Set the number of cubes to generate
num_cubes = 20

# Set the range of random coordinates
min_coord = -10
max_coord = 10

# Create a geometry node in the obj context
geo_node = hou.node('/obj').createNode('geo', 'Random_Cubes')

# Loop through the number of cubes
for i in range(num_cubes):
    # Create a box node
    box_node = geo_node.createNode('box', f'box_{i + 1}')

    # Generate random coordinates
    x = random.uniform(min_coord, max_coord)
    y = random.uniform(min_coord, max_coord)
    z = random.uniform(min_coord, max_coord)

    # Set the box node's translation parameter
    box_node.parmTuple('t').set((x, y, z))

    # Connect the box node to the merge node
    if i == 0:
        merge_node = geo_node.createNode('merge', 'merge_boxes')
    merge_node.setInput(i, box_node)

# Set display flag on the merge node
merge_node.setDisplayFlag(True)
merge_node.setRenderFlag(True)

# Layout the nodes in the network editor
geo_node.layoutChildren()
Copy and paste the script into the Python Source Editor in Houdini and click the "Apply" button. This will generate 20 cubes at random locations within the specified coordinate range.

This machine does not have Houdini installed, so I cannot view the output.
Just thought I would pass it on.

BTW it seems that chatGPT understands other 3D applications, including POVRay. Who would have guessed?
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Technical Discussion » How to blend dynamic sim with keyframe animation?

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litote
255 posts
Offline
 March 22, 2023 20:47:37
Is there a way to animate a fractured object with keyframes and make the simulation take over when it collides with another fractured object using a DOP network?

I know you can add some initial velocity to the initial state of an object within the sim, but this does not give much control over animating its path, as with keyframes.

Setting the state of an object to Deforming Active Objects is an option but it starts give odd behaviour if you animate much past the frame of impact.
Edited by litote - March 23, 2023 02:31:33
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Technical Discussion » emission is offset compared to density vdb - redshift render

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MathiasRodriguesBjerre
8 posts
Offline
 March 22, 2023 18:48:05
My emission vdb is for some reason not at all the same place as my density vdb when I hit render in redshift

In the viewport they're in the exact same spot

I'm pretty new so I have no idea how it ever got like this, I have enough trouble following along with volume rendering tutorials since there's not a lot of info when it comes to plugin in your input into redshift nodes
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Technical Discussion » Vellum: Looking for a way to emit a connected cloth stream

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CYTE
779 posts
Offline
 March 22, 2023 16:11:18
Hey everybody,

Im looking for a way to emit a connected cloth stream or even a connected line of vellum points.
Is there any way to do this?

Cheers
CYTE
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Solaris and Karma » object merge or postage stamp

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alnh
17 posts
Offline
 March 22, 2023 14:51:22
Is there anything like an object merge or nuke's postage stamp for the top level of the stage? I'm making a bunch of instancers and have lines crossing all over the place atm - would really like to organize and clean things up.

Cheers!
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Houdini Engine for Unreal » Houdini To Niagara - Looping Issue

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CamilloRT
3 posts
Offline
 March 22, 2023 09:07:00
Hello there,


I'm trying to animate points along Curves via a Carve Node and export the animation as a Point Cache File (.hbjson). This baked point cloud animation is used to reference fish models on those points later in a Niagara system.
In the Carve Node I set animation keys for "First U" from 0 to 1. Later in Unreal I setup a mesh renderer for the particle system, so flying orientation in Unreal is important.

The exported result does not loop correctly in Unreal and I already found some approaches to fix this, using a "Labs Make Loop" node for example. This messes up/shortens the animated paths of my curves and orientation of my points. I didn't use a POP Network to animate my points like the person did in the tutorial, but I assume using a POP Network wouldn't solve my loop problem here.
(Tutorial for this approach: https://www.youtube.com/watch?v=5N2tPBTyHO4&ab_channel=SmallRobotStudio)

I also found a similar forum post 2 Years ago (https://www.sidefx.com/forum/topic/79399/).


Is there a way to achieve clean loops in this case?
Thanks!
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Technical Discussion » Distributed simulation

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Francisco Tejo
3 posts
Online
 March 21, 2023 17:07:46
Hello I am having hard time trying to use Distributed simulation wit my mini farm(3 computer) under ubunbtu using Hqueue, getting many errors, anyone have some expierence with distributed simulation? or another software can recomend to run a simulation on the farm
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Technical Discussion » Vellum fluid configuration based on SOP displacement

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LaurentNovac
2 posts
Offline
 March 21, 2023 15:46:54
Hi Everyone, my setup here is a deformed surface by displacing along the normals using point attributes computed by a chopnet. No problem for that just for co text.

I then pipe this to a vellumfluid sop.

I have Nothing specific in my dopnet except Vellum source vellum object piped in a vellumsolver

My grains are deformed properly but my purpose was that "strong" spikes / displacement would result in part of the grains to detach a bit like a fluid splash/burst. (I use the particlesfluidsurface sop after solving).

I tried different parameters such as surface tension, viscosity, etc... And for the life of me i cannot have some groups of grains to detach.

Could you guys give me a hint on what to try ?
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Technical Discussion » Beach tank / fluid not visible in render.

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Temla
1 posts
Offline
 March 21, 2023 13:38:38
Hi,
I have made a simple beach tank and trying to render it in Mantra (in stage). Often, the water doesn't show up at all, but this is how some of the render results have been looked like the past days. Sometimes, I have succeeded to render a single frame with the water, but then everything disappears. It's all gone in both render and viewport, even if I have caches and even if I open up the project on another computer. And then I have to start over. What am I missing? Is it just a memory problem?
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