haymaker
Feb. 3, 2022 08:23:22
Is it possible to do in karma. Does anyone still use it?
TangheStudent
March 25, 2022 19:26:05
This seems to do the thing.
jerry7
May 23, 2022 22:23:20
TangheStudent
Image Not Found
This seems to do the thing.
Hi,
I tested ,but it has not effect because there is no velocities primvar if animating by transform lop.
TangheStudent
May 28, 2022 10:20:51
what you need to do then is add the v atribute with a trail sop and rename it to velocities.
It could be that you need to promote the attribute to a primitive aswel wich might paint ver primitive instead of point.
But i haven`t tested out if it works with points.
No_ha
May 29, 2022 02:35:02
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.
arx_anima
May 29, 2022 03:46:27
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
jerry7
May 29, 2022 08:28:03
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
May 29, 2022 10:58:52
I think you'll find that this will have a much improved workflow in the next major version of Houdini.
agastyafx
Sept. 8, 2022 07:54:39
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
Sept. 8, 2022 11:55:51
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 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
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.
ysysimon
Sept. 9, 2022 12:01:28
jerry7
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!
It's seems to be a Houdini19.5 things.
APESTARSTREAK
March 24, 2023 12:48:16
it doesnt work in xpu
nicolaas.tanghe
April 1, 2023 15:05:13
you can do a pass with cpu where you don't render anything except the aov.
pranesh arry
June 6, 2023 13:05:18
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!
0x384c0
June 21, 2023 08:45:33
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.
digones
April 26, 2024 14:21:38
pranesh arry
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!
Image Not Found
Image Not Found
Have you managed to make it work? I've been stuck trying to output AOV motion vectors with no sucess
npetit
April 26, 2024 22:54:59
On the Karma Render Settings LOP node, if you turn off Rendering > Camera Effects > Disable Image Blur do you get the expected motion blur?
Are you rendering with XPU or CPU? Only CPU has motion vectors supported at the moment.
Here's a hipfile that shows it working.