Unity 2018 Shaders and Effects Cookbook

How to do it...

The Lambertian reflectance can be achieved with the following changes to the shader:

1. Begin by replacing the shader's Properties block with the following :

Properties {  _MainTex("Texture", 2D) = "white" }

2. Since we are removing all of the other properties, remove the _Glossiness, _Metallic, and _Color declarations inside of the SubShader section.
3. Change the #pragma directive of the shader so that, instead of Standard, it uses our custom lighting model:

#pragma surface surf SimpleLambert  

If you try to run the script now, it will complain that it doesn't know what the SimpleLambert lighting model is. We will need to create a function called Lighting + the name that we gave here with instructions on how to light the object, ...