Volumetric Material - particles rendering

[ondr8]

Hi,
I have not been able to render smoke using particle simulation. I created a sphere with a V-Ray Volume material assigned to it, following the guidance from this post: https://forums.chaosgroup.com/forum/...etric-material This cloudy sphere renders fine on its own. But when it is emitted using particle simulation, it does not render (and the original sphere disappears from the scene too). I hope I make sense. Other materials render fine, so the problem must be in Volume material. Also, doing the same thing using Vladimir's file "clouds_mtl_volume_schematic" from the above mentioned post worked fine. There I noticed the V-Ray Volume in the Shader tree is located in a group that is neither a 'material', 'group' or 'folder' but an 'item' (which I do not know how to setup), could this be where my problem is?

Help would be appreciated, many thanks in advance.

Regards,
Ondrej

[vladimir.nedev]

Are you using GPU rendering ? There seems to be an issue with the volume material and GPU rendering.

Greetings,
Vladimir Nedev

[ondr8]

Hello, I'm using CPU. It works just fine when I open your scene "clouds_mtl_volume_schematic" you uploaded here: https://forums.chaosgroup.com/forum/...etric-material
But when I recreate mine it does not. So I don't think it's a V-Ray issue, it's just me doing something wrong...

[vladimir.nedev]

I am attaching an example using a Replicator.

Greetings,
Vladimir Nedev

[ondr8]

Hello, thanks for sharing the scene, but unfortunately it still did not render for me, both CPU/GPU.

But I just found out that if the replicated object is nothing but a not-subdivided cube it renders fine, but looks weird having a boxy smoke. If it is any other shape, almost all of the Volume mat. disappears when using a Replicator.
When subdivided, there is a little bit of the Volume still visible at the start of the render, however, as soon as it begins to clear out it fades completely away:

Regards,
Ondrej

[felixxia]

is there any fix for this? i wonder if i can create clouds in houdini and bring that vdb to modo to be rendered with vray. is it possible or not?

[larry.vasquez]

We're looking at pulling water sim in from Houdini. Check this out: https://docs.chaosgroup.com/display/...+Proxy+objects

[boyan]

Hey,

VDB file/s exported from Houdini will be great and you won't have a problem with V-Ray for Modo to render it.

Cheers,