Seeking help with shading TurbulenceFD in Octane

Newtek Lightwave 3D (exporter developed by holocube, Integrated Plugin developed by juanjgon)

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OlaHaldor
Licensed Customer
Posts: 148
Joined: Sun Jul 07, 2013 7:48 am
Location: Norway

I wonder if anyone's got a scene or a tutorial on how to shade turbulenceFD sims for Octane.
Smoke, fire, explosion.. I'm testing things here on my own with temperature, density and burn channels, but I'm not getting anywhere.

I can get it to render flames, but it's not affecting the shading of the smoke. The fire is also very bright and overexposed.
The smoke is bland and very seethrough. Not much shading going on.

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Invert absorption is probably the wrong thing, but I thought it made better looking smoke.
Modo & LightWave 3D | Win 10 x64 | RTX 2080 Ti | Threadripper 2920x | 128GB
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haze
OctaneRender Team
Posts: 1003
Joined: Sun Feb 08, 2015 8:57 pm

I don't have much time but to give you a rough idea, I get good results with this approach:
1. reduce density
2. reduce volume step length
3. reduce emission power dramatically

at this point, tweak the absorption colour. When it shades badly it's almost always caused by a volume step length that is too large because in that case, the ray march only completes a single step over the entire volume (misses a LOT of detail!)
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