Voxel issue, Arnold Maya

[gabriele.martinacci]

Hi everybody, I'm playing with volume shader in Maya with noise. everything is working fine but I have an issue with voxel. I don't know why but I can see the lines between each voxel. I tried to reduce or increase step size, volume padding but nothing change. The only thing I noticed is that If I decrease the scale of the noise this problem disappear. But it's not ok cause ruin the shape that I've created. The only thing I think could be the cause it's the scale. The model is 2 meters tall. Btw, I can't share the scene, I can only share this screen.

Thanks in advice.

[lee_griggs]

aiNoise? Can you post your settings (Win+Shift+S) and/or assign it to a sphere and upload it somewhere?

[gabriele.martinacci]

Ok, I've got the permission to upload the scene. I've notice, with a cylinder, that I have only one voxel. Increasing the subdivisions, the number of voxels increase as well. By the way:

https://drive.google.com/file/d/1EAWmUBieoe5-JuoJ0TaIqNgvtigd4Wsw/view?usp=sharing

Thanks!

[lee_griggs]

It's too big. Just assign it to a sphere, please.

[gabriele.martinacci]

Sure! This is what I see on a simple Cylinder.

This is what I see on my mesh:

Btw, this is the scene with a sphere. Unfortunately I can reproduce the issue on it:

https://drive.google.com/file/d/1oJans_fxHaaL8TqvfDUOmvPYLD18oyY9/view?usp=sharing

[lee_griggs]

Yes, I don't see the issue in your sphere scene. This info might help:

"The artifacts may not occur if the overlapping volumes have zero anisotropy (i.e. scatter_anisotropy in the case of standard_volume, and transmission_scatter_anisotropy in the case of standard_surface, are both zero). This could be a temporary workaround, though it's obviously not ideal to be forced to disable anisotropic scattering. There may be fix for this in a future release."

[gabriele.martinacci]

They are set at zero... I noticed that if I use an area light the issue it's not present at all, or, at least I can't notice it. By the way, thanks for your time and patience.