[HOU-2387] Particle Render - Extremely Slow -

[hsz]

I'm doing some tests/r&d to render particles 20 Mil > and more with Vray and I also tried other renders like RS, Arnold, 3Delight, and Vray was the worst to render points/particles with motion blur enabled. Attached is the .hip - It must something wrong I can not believe that Vray takes soooo long to render just points. I tried to render in Cuda as well but it failed sometimes and it was not stable.
This test is around 18 mil.

Redshift GPU - 22 sec

Arnold CPU - 50 sec

Vray CPU - 35 Min
Vray CUDA/GPU - 2 min

HIP
https://www.dropbox.com/s/j5i5v3i0th...ayBug.zip?dl=0

[pixeltrain]

Interesting - played with your file and I had the same experience .
Tried 3DLight - 55 sec, but slower machine

So I think, this must be a bug or a configuration problem. Hope the Chaosgroup guys will look into that.

[glacierise]

What kind of shader? As far as I know, the many points with volume shader workflow is not there in V-Ray yet, unfortunately. And it's very important for our VFX use case.

[hsz]

Is simple Vray material as you can see. If you want to see how long it takes on your side please do so. I attached the HIP File

[glacierise]

Yeah it needs improvement there

[chakarov]

We are looking at this.

[hsz]

Thank You! - I hope this gets fixed soon. I would like to use Vray for this.

[hsz]

Hi Developers, any word on this? Someone was testing the same scene in 4.3 I believe it was and they said that pts render super fast? so it might be an issue with vray 5 IM guessing? Just wondering how is the progress? I try to render again a week ago with the latest nightly and I got the same result.

Thank you!

[vlado]

Yes, one of our developers is currently looking into this.

Best regards,
Vlado

[ronald_a]

Hi Developers, any word on this? Someone was testing the same scene in 4.3 I believe it was and they said that pts render super fast? so it might be an issue with vray 5 IM guessing? Just wondering how is the progress? I try to render again a week ago with the latest nightly and I got the same result.

Thank you!

I can say for sure that they are not faster in 4.3. In fact rendering many points in vray has always been on the slow side (at least what I know from using maya - in houdini I always use mantra for that). Would be really great to see this render with speeds comparable with other engines.

[glacierise]

Adding up to this - many points renders are very important for our work - rain, snow, dirt, debris, foam, energy effects - and it would be great to have that improved. Besides the peformance, the other missing pieces are a pscale shader, delayed load geometry shader, and point volume shading.

[pixeltrain]

Good feature list, Hristo
Yes, a fast and flexible points rendering is needed by many of my trainings clients.

[hsz]

Any ETA on this bug? is a huge one. Thanks

[hsz]

I'm bumping this one again, but I would really like to know what's going on with this request.
Thanks

[ronald_a]

Hi,

it appears that particles are rendering A LOT faster now. Very nice!

Kudos to the developer looking into this!