Simple 2 Tone Fog

**Note: Does NOT work with transparency. **

Workaround is to use opaque with alpha clipping where possible, for impostors, tree leaves, etc.

-No code: shadergraph only-

A fullscreen fog shader that blends linearly over distance from your existing scene, to a middle distance color, to a far distance color; with a version that replaces the sky entirely with the far color or another that blends into the sky at the horizon.

Additionally, another version of the shader reacts to the rotation of the main light in the scene, i.e. the sun, and transitions between dawn, day, dusk, and night colors.

A fourth version handles this transition with a float instead, in case you want to change it with code.

-How to use: add a Full Screen Pass Renderer Feature to your Renderer asset, and apply one of the fog materials. (See included documentation for more details)