Lambert
Adding a light to a shader
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Multiple Lights
Extending lighting to multiple lights
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Multiple Lights Single Pass (Unity Only)
An approach I found to approximating multiple lights in a single pass for Unity.
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Rim Lighting
Faking lighting with a frensel, based on the main directional light.
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PhongAdding a specular highlight
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Phong TexturedSpecular mapping via a texture alpha
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