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linvanoak In reply to Mann-of-LaMancha [2015-03-06 06:20:36 +0000 UTC]

Good observation on the Refracton vs Scattering of the hair.
It definitely was and still is not the final hair shader I am going to use for all future projects.
In Izarra - Just another emergency  I toned down the Refraction part and focused a bit more on Scattering.
Since that hair is very dark the effect is now almost not visible anymore.

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There are now quite a lot of different SSS based shaders layouts different people experiment with for OctaneRender. And a lot of them are using different combinations of Scattering, Refraction and Transmission.
For example the Redspec TGX shader has a lot more of a subtle Scattering part but focuses a lot more on Transmission effects.
The risk with Scattering is that the skin starts to look wax like.
Nevertheless if you focus too much on Transmission you get the "light bulb" effect where the mouth and nose are starting to light up quite red if you do not use the proper maps to keep that effect in check.

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I guess one way is to try to find a "realistic" solution. But if you really want realistic SSS you would have to place a skeleton and organs inside your 3d figure geometry.
The passes now help a lot to figure out what the result is if you change Scattering, Absorbtion and Transmission settings.
But in the end you still are left with the choice what kind of style you actually want to achieve.
There may be some "realistic" choices but in the end it all comes down to what you think is the skin look you enjoy.

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I will keep trying out different node setups to see what I can come up with.

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@ System:
OctaneRender now supports out of core textures.
This means with even a 2-3 GB VRAM graphic card you can create much larger scenes because the textures can be saved in your system memory.
The fiber hair nevertheless is still a challenge because it uses a lot of space in the VRAM.

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Mann-of-LaMancha In reply to linvanoak [2015-03-06 14:49:47 +0000 UTC]

Hmm. A lot for me to chew on...

Hrm. Well, isn't that proper for dark hair in real life settings? Dark hair tends not to have a lot of ...I want to say "shine" but I don't think that's the right word, so insert whatever word seems appropriate... , right?

Okay, so... too much scattering and you get a waxy buildup (). Okay, back to serious. Question: it sounds like the textures of a person are translucent which allows light to, let's say, shine from behind them, and seep through to the front. A map (or masking effect?) would negate or normalize translucence. In people, some of the skin is translucent. Take a bright flashlight and cover it with your palm, then look at the back of your hand, and you'll see where the skin becomes "red." Perhaps this effect in the program was created to replicate that real life effect to get digital renders to look more realistic? How much you mask would mean how realistic it is. Need to think on that some more...

I hope to see posted updates of your setups. I don't know about anybody else, but I find that sort of knowledge informative.

I'm not crazy about hearing that something can be saved to system memory.

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