Such a simple thing like milk could become a real pain in the butt in term of shaders. It looks white but it isn’t. Milk is considered an opalescent liquid, an effective definition of this property could be found on wikipedia, here’s a quote
The material appears yellowish-red in transmitted light and blue in the scattered light perpendicular to the transmitted light.
In this case was clear I needed a shader that would scatter yellow-reddish hue as light passes through it and bluish when reflecting it. I set up the material using a blend shader, nested shellac and vray materials with traslucency turned on, the sub-surface scattering effect would return the yellow-reddish tint on one side and the bluish on the other base on the color swatches assigned, the effect is sensitive to the position of the light in the scene, in thise case a stronger light source was placed on the right side, therefore the bluish color is prominent torward the light while the opposide side would show a warmer color.
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Nov 2008
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