Motion vector AOV in Karma
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- No_ha
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Just to note this. As far as I can see, the velocities described in this thread are only taking into account the velocity on the geometry not the geometry relative to the camera.
But I also can’t give any explanation on how to create a proper motion vector AOV like in mantra.
But I also can’t give any explanation on how to create a proper motion vector AOV like in mantra.
Edited by No_ha - May 29, 2022 02:42:35
- arx_anima
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arx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
Hi,
I tried ray:motionvector and ray:velocity, but can't get the result.
Could you give any tip?
Thanks!
- mark
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- agastyafx
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What's the difference between motion vector and velocity. Is it with respect to camera? I'm getting data rendered in motionvector but not in velocity
arx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
- jsmack
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agastyafx
What's the difference between motion vector and velocity. Is it with respect to camera? I'm getting data rendered in motionvector but not in velocityarx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
motionvector is a screenspace vector, useful for post processing applications of motion blur. I'm not sure what ray:velocity is, but it's probably in world space.
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jerry7arx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
Hi,
I tried ray:motionvector and ray:velocity, but can't get the result.
Could you give any tip?
Thanks!
It's seems to be a Houdini19.5 things.
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arx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
Hey there,
I tried checking both the motionvector and velocity in the karma render node, however I still get a blank output. Am I missing something?
Thanks!
Pranesh Arry
3D Generalist at North Studio
3D Generalist at North Studio
- 0x384c0
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For motion vector to appear in renders do not forget to setup "Motion Blur" in Karma Render Properties [www.sidefx.com] and cache [www.sidefx.com] your animation.
Edited by 0x384c0 - June 21, 2023 08:46:15
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pranesh arryarx_anima
the karma node or the karma standart rendervars node has motion vectors and velocity aov as default to check.
We used them already in production and they work fine, they do not use primvars but a ray level check
ray:motionvector
ray:velocity
Hey there,
I tried checking both the motionvector and velocity in the karma render node, however I still get a blank output. Am I missing something?
Thanks!Image Not FoundImage Not Found
Have you managed to make it work? I've been stuck trying to output AOV motion vectors with no sucess
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- chabashvili
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I think I have a related problem. When I turn on motion blur (velocity) in Karma render settings and turn on Disable Image Blur, when rendered the geometry shifts towards motion blur direction. When Disable Image Blur is turned on it renders as expected. If I do not turn on motion blur, I do not get any velocity or motion vector AOVs, they come out blank. Tried it both on CPU and GPU and in both cases its the same. I'm on 20.5.278 right now.
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