The gl_FragCoord variable stores four components: (x, y, z, 1/w)

What is the w coordinate and why is it stored as 1/w?

This document targets one specific type of Unity Shader using Shader Lab and CG with vertex and fragment shaders. In many cases these shaders can be implemented in a variety of was including pure ShaderLab or CG surface shaders. Don’t email me telling me…

Okay, first up, this is only going to cover some basic vertex-fragment shader stuff (as opposed to the other types of shaders you can make in Unity, which, for reasons listed elsewhere, have various disadvantages).

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Tutorial about writing the first shader in Unity3D