Diffuse
Note. Unity 5 introduced the Standard Shader which replaces this shader.
Diffuse Properties
Diffuse computes a simple (Lambertian) lighting model. The lighting on the surface decreases as the angle between it and the light decreases. The lighting depends only on this angle, and does not change as the camera moves or rotates around.
Performance
Generally, this shader is cheap to render. For more details, please view the Shader Peformance page.
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