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Technical Discussion » Alembic import Scatter issue
- Heileif
- 125 posts
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I'm only on my phone now, but it sounds like you need to pack the tree before scattering. Then the separate pieces should become one.
Solaris and Karma » Asset library path change
- Heileif
- 125 posts
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Technical Discussion » Houdini Ocean Procedural in Karma
- Heileif
- 125 posts
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We have been using the ocean procedural for allmost 200 shots on a project. When only displacing a grid we could have it low. But when using it to displace a flip sim we needed to have dicing close to 1, or we would see the seam on many shots between sim geo and the extrudet geo.
It used allot of ram, but made it so much easier to render ocean in Redshift.
It used allot of ram, but made it so much easier to render ocean in Redshift.
Solaris and Karma » if you can't do something in Houdini, you can't do it in any
- Heileif
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Staglaitortamte
Tomas Slancik
FX Supervisor
Method Studios, NY
I've also heard that if you can't do something in Houdini, you can make the tool yourself and do what we want.
If not using karma camera - can I build an advanced camera myself using vex?
You can make lens shader with vex https://www.sidefx.com/docs/houdini/solaris/karma_lens_shader.html [www.sidefx.com]
Never tried to make one myself.
Would be nice if the same effect that's possible with Arnold and Lentil [www.lentil.xyz] plugin is possible in Karma to, but I have no idea.
Solaris and Karma » MATERIAL override in LOP/SOLARIS, reading primvar
- Heileif
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Just a little heads-up regarding Redshift.
To use primvar strings with Redshift, you need to feed the string into this OSL shader [github.com] using the "RS String User Data" node.
To use primvar strings with Redshift, you need to feed the string into this OSL shader [github.com] using the "RS String User Data" node.
Edited by Heileif - April 3, 2024 19:18:38
Solaris and Karma » Karma - Unexplained increases in memory usage
- Heileif
- 125 posts
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I just tried a quick test with "KARMA_XPU_OPTIX_CURVE_OPT_LEVEL=1". Memory consumption almost cut in half in my hairy sphere test :O
Technical Discussion » Houdini 20.0.625 , the light linker shadow link is not work
- Heileif
- 125 posts
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XPU does not support shadow linking yet.
You can see feature list here. https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html [www.sidefx.com]
You can see feature list here. https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html [www.sidefx.com]
Technical Discussion » USD Primvar as a Parameter
- Heileif
- 125 posts
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ramonmascaros
Thanks Heileif!
I don't know much of python, so I'm going to try what you said that for sure is the best. (I still don't get "Forum removes the brackets with 0 inside after the "inputs()" but i'll figure it out)
Meanwhile I have something in the middle.
· @time_end= usd_metadata(0,"/","endTimeCode"); in an attributeWrangle
and a edit properties node to get it
but always i need to update clicking on "set all parameter values from usd primitive"
Thanks!
Did you get it to work?
You need the brackets with a 0 inside to get the first item in the Python list, because "hou.pwd().inputs().stage()" returns a list.
https://www.w3schools.com/python/python_lists.asp [www.w3schools.com]
Technical Discussion » Optimal CPU in a new $ 2-4k build
- Heileif
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It seems AMD new cpus is not to far far away.
https://www.notebookcheck.net/Insane-AMD-Zen-5-single-core-performance-bump-on-cards-as-leaked-Cinebench-R23-result-blasts-Ryzen-9-7950X.804679.0.html [www.notebookcheck.net]
If these rumors are true, big improvement comming.
https://www.notebookcheck.net/Insane-AMD-Zen-5-single-core-performance-bump-on-cards-as-leaked-Cinebench-R23-result-blasts-Ryzen-9-7950X.804679.0.html [www.notebookcheck.net]
If these rumors are true, big improvement comming.
Solaris and Karma » How to access primvar value from channel
- Heileif
- 125 posts
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Python solution here https://www.sidefx.com/forum/topic/94981/?page=1#post-416460 [www.sidefx.com]
Houdini Lounge » A Comprehensive Feature List Between Karma XPU + Redshift
- Heileif
- 125 posts
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tbay312
One last thing - From my understanding Karma XPU...
* Doesn't have AMD GPU Support
* Doesn't have Metal GPU support on Mac OS
* Partially supports Out-of-Core rendering via texture eviction
Is that correct at the moment?
Seems almost correct to me.
XPU does support more than out of core textures.
Not sure if I remember 100% correctly but I think Brian Sharpe [www.sidefx.com] mentioned that primvars can go out of core to.
Edit:
I found the post https://www.sidefx.com/forum/topic/93361/ [www.sidefx.com]
Edited by Heileif - March 16, 2024 11:27:31
Technical Discussion » USD Primvar as a Parameter
- Heileif
- 125 posts
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Only way I know of to get a primvar is Python expression inside a parameter.
Example:
"
value = hou.pwd().inputs().stage().GetObjectAtPath("/cameras/camera1.horizontalApertureOffset").Get()
return value
"
If the value you want have timesamples the only way I have gotten it to work is to add frame number inside the "Get()".
Like this.
"
frame = hou.frame()
value = hou.pwd().inputs().stage().GetObjectAtPath("/cameras/camera1.horizontalApertureOffset").Get(frame)
return value
"
Forum removes the brackets with 0 inside after the "inputs()" for some reason, so you need to add that back inside the code.
But it sounds like you want metadata instead of primvars, that code is a little different. Can add metadata read code later when back infront of computer.
Edit:
"
hou.pwd().inputs().stage().GetMetadata("endTimeCode")
"
If you need customData from the Metadata this is one way to do it.
"
hou.pwd().inputs().stage().GetMetadata('customLayerData')
"
You will need to add brackets mentioned earlier for it to work.
Example:
"
value = hou.pwd().inputs().stage().GetObjectAtPath("/cameras/camera1.horizontalApertureOffset").Get()
return value
"
If the value you want have timesamples the only way I have gotten it to work is to add frame number inside the "Get()".
Like this.
"
frame = hou.frame()
value = hou.pwd().inputs().stage().GetObjectAtPath("/cameras/camera1.horizontalApertureOffset").Get(frame)
return value
"
Forum removes the brackets with 0 inside after the "inputs()" for some reason, so you need to add that back inside the code.
But it sounds like you want metadata instead of primvars, that code is a little different. Can add metadata read code later when back infront of computer.
Edit:
"
hou.pwd().inputs().stage().GetMetadata("endTimeCode")
"
If you need customData from the Metadata this is one way to do it.
"
hou.pwd().inputs().stage().GetMetadata('customLayerData')
"
You will need to add brackets mentioned earlier for it to work.
Edited by Heileif - March 16, 2024 12:01:19
Technical Discussion » Vram Consumption Calculator for Karma
- Heileif
- 125 posts
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jtk700cln
Is there a way for me to get a read out on vram consumption required for rendering with karma xpu? I’m finding I’m hitting vram limits very quickly so it’s disabling optics, but it would be great to get a rough idea of what the needed vram need is per frame so I can plan accordingly.
Thanks!
You can turn on render stats to get some insight on how much vram XPU is using.
Display Options>Guides>Render Stats
Solaris and Karma » Equivalent to Redshift's "camera space render" feature
- Heileif
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Houdini Lounge » A Comprehensive Feature List Between Karma XPU + Redshift
- Heileif
- 125 posts
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tbay312TwinSnakes007
Next RS release will have some long requested features, a few of them are huge.
One thing RS currently doesn’t have is support for Clone.
Hey @TwinSnakes007 ,
I'm having some trouble looking up this "Clone" that you mentioned. What is that referring to exactly?
Some info here https://www.sidefx.com/docs/houdini20.0/ref/panes/clonecontrol.html [www.sidefx.com]
Houdini Lounge » Weird noise in speaker seems to be from Houdini & GPU?????!!
- Heileif
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MinistryofSpaceandTime
Have same issue. Strange buzz appears only when moving objects using handles in viewport. It's defenetly sound from hardware, dunno ist it videocard or else, but seems very strange. Hardware - Laptop RTX 3060, I7, have a latest nvidia studio driver 551.61. Does anyone have a clue on what is that can be?
Coil Whine.
Houdini Lounge » A Comprehensive Feature List Between Karma XPU + Redshift
- Heileif
- 125 posts
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habernir
nice comparison but their is a subjects that i dont understand like features "non usd" or "rs proxy" or "material x" ..... thats not related to the comparison because xpu will never have rs proxies and its always will be for usd (i think)and also karma XPU was built with material x support from the ground-up soo no need to mention it.
and you compare "hybrid rendering" soo how can you compare karma XPU that was built from the ground-up for multi-devices to redshift ? its a two different worlds
but isn't the comparison too early? because XPU is relative new
I think it's important to mention the MaterialX in the comparison. Especially for people who are planning on interchanging shaders, or have a MaterialX library they still want to use without converting all the shaders.
Houdini Lounge » A Comprehensive Feature List Between Karma XPU + Redshift
- Heileif
- 125 posts
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Karma XPU is also missing the ability to turn a mesh into matte object [help.maxon.net].
Redshift can also not render AOV's at the same time as deep is active, only Cryptomatte works when it's activated.
Redshift can also not render AOV's at the same time as deep is active, only Cryptomatte works when it's activated.
Edited by Heileif - March 11, 2024 20:50:40
Houdini Lounge » A Comprehensive Feature List Between Karma XPU + Redshift
- Heileif
- 125 posts
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Nice list
Found something that is not 100% correct.
Redshift does not have LPE tags or cell shading at the moment.
Redshift can have a room shader using a OSL shader from the Redshift OSL Github page https://github.com/redshift3d/RedshiftOSLShaders [github.com]
Found something that is not 100% correct.
Redshift does not have LPE tags or cell shading at the moment.
Redshift can have a room shader using a OSL shader from the Redshift OSL Github page https://github.com/redshift3d/RedshiftOSLShaders [github.com]
Edited by Heileif - March 11, 2024 20:14:36
Technical Discussion » Houdini functionality
- Heileif
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