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Absorption like Krakatoa for Smoke Volumes

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Hey all, I'm curious if there is a way to render volumes such as billowy smoke with absorption . Here is a reference of absorption done in krakatoa http://assets.digitaltutors.com/dtv_/bison_courses/558/detailed_images/5.jpg

I've tried setting up a few lights and tweaking the billowy smoke material but I can't seem to get the right look as shown in the reference. Any advice would help.

Thanks!

Edited by rhussain

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Hey all, first post. I'm exploring houdini and I've previously used fumefx and krakatoa for smoke and fire simulation. I'm curious if there is a way to render volumes such as billowy smoke with absorption or some sort of subsurface scattering appearance. Here is a reference of absorption done in krakatoa http://assets.digita...ed_images/5.jpg

I've tried setting up a few lights and tweaking the billowy smoke material but I can't seem to get the right look as shown in the reference. Any advice would help.

Thanks!

I can't see your reference, but you can get volume scattering by setting the "volume limit", in your mantra ROP, to something higher than 0. It comes with a cost though... :D

Also would be ideal to use Micropolygon PBR.

Cheers

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brilliant! volume limit does exactly what I want, it lets the light scatter through. Thanks! Also is there a way to have a specific color scatter through for example yellowish skin color for the outer part of the smoke and red tone for the inner smoke. I'm guessing this is a shader manipulation thing. Or how can I ramp the smoke color based on density (less dense = yellow, very dense = red) I've does this kind of thing with particles color attribute using a vopsop.

Edited by rhussain

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Well if you use the pyro shader you can have a ramp style thing for free.

Initially it looks at the heat field, but you can use whatever field you want and change the ramp colour to whatever you want.

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thanks ChristianW, I didn't know that pyro shader was available. It's awesome and a great shader to study.

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By the way, there is the reference image from the first post: post-5855-0-74499800-1354259110_thumb.jp

Edited by nord3d

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Sorry for bumping the thread up, but the question seems really interesting. And we have reference now :)

So is that doable with Mantra? I mean it's probably most certainly doable, but well, maybe someone would like to shed some light on the topic, Mantra-wise. I believe there are clues which could be found in this paper below, but picking them ain't too easy for an average artist like myself:

http://magnuswrennin...Effects2010.pdf

Thanks guys.

post-8633-0-40592800-1375921035_thumb.pn

Edited by Alexander Saraev

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