Translucency

Often in the real world objects receive light from their back side: a paper held up to a light, a lamp shade, light bulbs, frosted or stained glass, sun-dappled tree leaves, etc. Translucency models this effect, letting light that originates behind a surface bleed through to the front.

The lamp shade gets a proper shading via Translucency and Illumination shaders.

Parameters

Surface Material is an input color computed by an illumination shader and modified by the Translucency shader.

Diffuse is the same color used by the illumination shader.

Transparency is the multiplier used to mix the input Surface Material color and the Translucency effect.