Prior to the introduction of the Physically Based Standard Shader, Unity was supplied with more than eighty built-in shaders which each served different purposes. These shaders are still included and available for use in Unity for backwards compatibility but we recommend you use the Standard ShaderA small script that contains the mathematical calculations and algorithms for calculating the Color of each pixel rendered, based on the lighting input and the Material configuration. More info
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This section begins by explaining how to use the legacy built-in shaders to maximum effect. The remainder of the section details all the available shaders, grouped into related “families”.