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Old 08-20-2010, 07:14 AM   #1
Okilo11
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Oliver Killoren
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Question Rendering particle sprites within fog volume box

Not sure if this is more relevant to rendering or dynamics, but here goes:

I'm trying to render particles in an underwater scene using sprites. I am rendering in mental ray with some cubes on the left and some rocks for test purposes.

Without fog, it looks like this:

which is fine and dandy, except there is no volumetric fog.

With fog, the entire sprite squares within the fog volume box are showing up:


Any thoughts?

Last edited by Okilo11 : 08-20-2010 at 07:19 AM.
 
Old 08-20-2010, 09:35 PM   #2
animatedfox
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Quick question

Just wondering what the sprites are?
Are they little floating bits in the water?
If so, I would suggest using little randomly scaled tiny bits of geo instanced or a particle cloud render type.
If not, I am off the mark and maybe someone will have the secret to your problem.
 
Old 08-20-2010, 09:58 PM   #3
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Are you using Maya's light fog, or are you using mental ray's parti-volume shader?
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Old 08-21-2010, 04:37 PM   #4
Okilo11
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Quote:
Originally Posted by animatedfox
Just wondering what the sprites are?
Are they little floating bits in the water?
If so, I would suggest using little randomly scaled tiny bits of geo instanced or a particle cloud render type.
If not, I am off the mark and maybe someone will have the secret to your problem.


That did the trick, thanks!

Quote:
Originally Posted by InfernalDarkness
Are you using Maya's light fog, or are you using mental ray's parti-volume shader?


I'm still new to Maya (Was a Max User) but I believe I am using Maya's. Created a volume box and made fog that way.
 
Old 08-21-2010, 05:51 PM   #5
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Glad it's working for you!

If you want light rays shining through, and want them occluded and casting volumetric shadows, you'll need to use the parti_volume shader though. It can be a pain and takes forever to render, so hopefully you won't need it for your scene.
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Old 08-21-2010, 05:51 PM   #6
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