Here is a shader that implements the distance-based opacity calculation.

We're building shaders around opacity, but the distance-based transparency attenuation I explained in the previous post needs transparency, T, not opacity, O.

Remember that I said opacity and transparency are complements of each other.

So: O = 1 - T and T = 1 - O

Remember that the transparency is T ** D, where D is the distance.

T ** D
= (1 - O) ** D

This gives the effective transparency.  We need to convert that to opacity to plug into the Poser Surface.

1 - (1 - O) ** D

This is the heart of the shader above. But what is D?

Guess what ... it is 1 / cos(alpha) again.

In the shader, the bottom right node is the desired cloth opacity, O. The rest is the equation:

1 - (1 - O) ** (1 / cos(alpha))

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