RGB fluid render passes

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Old 09 September 2012   #1
RGB fluid render passes

So im trying to kick out render passes (beauty, diffuse, spec, incandesences ect...) for fluids but the only thing that gets kicked out is a beauty pass. If been searching around and came across a three point rgb lighting technique but unsure on how it completely works or set up. I also heard about some type of object volume shader technique. How does that work. Any help would completely appreciated. Ive attached a screen shot of what i'm trying to accomplish.
Thanks
http://vimeo.com/26613245
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File Type: jpg Screen shot 2012-09-22 at 11.54.01 AM.jpg (94.0 KB, 72 views)
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Old 09 September 2012   #2
rgb lighting technique I believe is just using a 3 point lighting rig using r-g-b for each light and render. One from the front left, one form the front right and one from the top.
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Old 09 September 2012   #3
As what Aikiman has pointed out, you can set it up using a rgb 3 point light.
Just rmb that you have to check "real light" option in maya fluid.

This is sth similar i did in the past:
http://vimeo.com/42689700#
 
Old 09 September 2012   #4
Can someone enlight me on how to use that RGB pass in comp?

I am completely clueless :S

Cheers.
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Old 09 September 2012   #5
I never use it but I think, as any rgb pass, you can relight or color corrected easier your fluid.
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Old 09 September 2012   #6
Regardless of compositing software you use, you need to isolate your red, blue and green channel and adjust the color to your liking.

In AE look for a "Set matte" effects, or if you are using nuke you can shuffle individual rgb channels using the shuffle node.
 
Old 09 September 2012   #7
SO by doing this, it just help to relight my fluids in composite app correct, but how about other passes? Maybe something like this
http://vimeo.com/25401258.
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Old 09 September 2012   #8
I still don't understand the relighting idea (why we should relight in comp?)

If we light things in 3D, we get renders, we get different components of the light and elements, why we may want to relight the scene with a lighting system that doesn't even have any kind of real light behavior or shadows?

I'm a veteran in 3D, but i still don't understand this, and i would like to, because i understand this is a common practice, but... why?

Cheers.
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Old 09 September 2012   #9
Originally Posted by CerberusC: I still don't understand the relighting idea (why we should relight in comp?)

If we light things in 3D, we get renders, we get different components of the light and elements, why we may want to relight the scene with a lighting system that doesn't even have any kind of real light behavior or shadows?

I'm a veteran in 3D, but i still don't understand this, and i would like to, because i understand this is a common practice, but... why?

Cheers.


Being in a small studio, we do not have the luxury of huge render farms, or well organised pipeline throughout the production. Sometimes we fx guys have to work at the same time as the lighting guys on the same shot, and thus it is difficult to match our lighting perfectly. If the lighting is not done properly, we will waste time having to render the whole shot over again, which is unhealthy for the production. So ultimately this saves time and trouble.
 
Old 09 September 2012   #10
I also find that the RGB pass for fluids can give you the ability to tweak the look of the final fluid, not 'relighting' really, but just give it more depth/definition.
It is quick, easy and can really add that extra tweakable oomph that makes people think you know what you are doing.
Give it a try and see what you can do with an RGB pass and a few color correct nodes in Nuke.
 
Old 09 September 2012   #11
So Im going to try this out tonight but im still interested in how to pull off more passes and what other passes are capable? Ill let you know how it goes
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Old 07 July 2013   #12
Incandesance

You can plug sampler info to fluid incandescence ramp.
normalCamera for eg.

connectAttr -f samplerInfo1.normalCamera fluidShape1.incandescence[0].incandescence_Color;

Just make sure, color ramp is all black. And incandescence should have only one color flag.
 
Old 07 July 2013   #13
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