Unity 2018 Shaders and Effects Cookbook

How to do it...

The following are the steps to create a normal map shader:

1. Let's get the Properties block set up in order to have a color Tint and texture:

Properties 
{ 
  _MainTint ("Diffuse Tint", Color) = (0,1,0,1) 
  _NormalTex ("Normal Map", 2D) = "bump" {} 
} 

In this case, I have 1 in the green and alpha channels and 0 for red and blue, so the default color will be green. For the _NormalTex property, we are using a 2D type, which means we can use a 2D image to dictate what each pixel will use. By initializing the texture as bump, we are telling Unity that _NormalTex will contain a normal map (sometimes referred to as bump maps as well, hence the bump name). If the texture is not set, it will be replaced by a grey texture. The color used ...