Is it possible to do in karma. Does anyone still use it?

This seems to do the thing.

TangheStudent

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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.

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.

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.

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

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!

I think you'll find that this will have a much improved workflow in the next major version of Houdini.

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

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.

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.

it doesnt work in xpu

you can do a pass with cpu where you don't render anything except the aov.

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!

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.

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!

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Image Not Found

Have you managed to make it work? I've been stuck trying to output AOV motion vectors with no sucess

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.

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.

Simply doesn't work in 20. Nightmare. Or 20 settings need to be in a certain way that even a lottery win is more likely. Both CPU and XPU don't tint any pixel in the Motion Vector path.

20.5 the same. No shading except from black pixels in the motion vectors aov. 20.5.332

Normal map, depth map, all show up nicely. MV doesn't.

What are the setting which need to be enabled/disabled to get the correct aov?