Industrial Light & Magic uses Lama on all their productions, including on the photoreal skin in The Irishman (© Netflix).
LamaSSS - Subsurface scattering is a way to create looks similar to skin, wax, and other surfaces where light penetrates and scatters inside the object. For example, when a candle is lit, the light from the flame also illuminates the wax itself, allowing light to pass through the wax. This is also why you can see sunlight through a person's ears or fingers when held against a flashlight. In subtle ways this is what makes skin appear soft and realistic.
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This value modulates RGB values as if they were light paths, and are represented in scene units. For example, a value of <0.5,0.4,0.2> will scatter red light 0.5 scene units. These values are multiplied by the Unit Length attribute and if set too high they will escape the surface giving you unexpected results.
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| Note : SSS is turned off by default (0,0,0) and creates diffuse reflection. Increase the radius to add SSS. |
Scale
This is a simple multiplier for the above Radius effect. This is useful for a quick tweak to the results, especially if you're driving the Radius with a texture and don't want to repaint. It's also useful when transferring a shaded asset between scenes with different scales.
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- Pixar - Albedo inversion model used at Pixar which prioritizes the albedo color as a final result.
- Chiang - Albedo inversion model which more closely represents the traditional random walk model published in 2016.