Writing a Snow Covered Shader

Lets write a custom snow covered surface shader in Unity that can procedurally generate snow and place it on top of any object in our scene. This will let us add any amount of snow to an object in any orientation and get it placed in your world really easily. This shader is built using world space normals and dot products. Every mesh has normal values applied to their vertices, these normals represent the orientation of the vertex in `object space`. `object space` is the orientation of normals relative to