ShaderFX custom code example

Here is an example of using the "Custom Code" node provided in ShaderFX to create a snow-layer effect.

We measure the angle between the vertex normal and the world UP (or "snow direction" if you wish) and blend in the white color on top of the rock texture.

We have a second custom code node that modifies the vertex position to give the snow some thickness.
Download Custom Code Snow ShaderFX graph