Artifacts and flickering with Maya nParticles

[ojk]

Hi Everyone,

I have some strange artifacts in my nParticle renderings. I've tested it with a very simple setup. Just one sphere that is emitting the particles and a turbulence field. I'm rendering the particles as spheres. In my viewport the simulation is just fine but in parts of my renderings there are serveral particles missing in some frames. This causes the flickering. There are squares where a bunch of particles are missing. Here are two following frames of my sequence where you can see the problem very good:

Frame 79 (everything fine):



Frame 80 (strange square):



Here's a zip file with the video and the maya file:

particleFlickering.zip

Do you have any ideas?

[Zdravko]

Thnak you for your feedback.
We added this issue to our bug tracking system.

[ivaylo.ivanov]

Adaptive subdivision is not good choice for such scene. I will be not surprised if it's missing the particles.

It's not that...

[ojk]

I've tried the DMC sampler as well but with the same problems... Do have any suggestions which method could be the best?

[bigbossfr]

I've tried the DMC sampler as well but with the same problems... Do have any suggestions which method could be the best?

Did you set the min sample of the DMC to 2 ?

[ivaylo.ivanov]

No, it's not the image sampler. I'm still investigating. You can try with dummy motion blur - duration 0.001, center 0.001, subdivs 1. It seems it doesn't happen with MB, but since the bug is random, it may be a coincidence.

[vlado]

This will be fixed for the next nightly build tomorrow. Btw it will also go away if you enable motion blur.

Best regards,
Vlado

[ojk]

Great, thank you!