A 2D lookup texture of diffuse lighting values designed to simulate the scattering behavior of human skin.
Artist's Notes:
If you're using the skin shader for monsters/other inhuman creatures, adjusting the hue and saturation of the LUT in photoshop can yield cool results. However, we do NOT recommend adjusting its luminance.
This effect is built around the use of an included Look-Up-Texture for diffuse scattering that is designed for human skin (though it can be hue-modified for a range of other effects). The Main base color alpha is used as a lookup for the skin LUT to control the strength of the scattering effect and where it occurs. Bias and Scale are normalized ranges that modify this lookup value and will likely need to be tuned by eye/aesthetic demands.