Uniform Diffuse Distribution (Photometric Lights)
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Create panel (Lights) Photometric Click Target Light or Free Light. General Parameters rollout Light Distribution (Type) group Choose Uniform Diffuse from the drop-down list.

Uniform diffuse distribution casts diffuse light in one hemisphere only, as if the light were emitted from a surface.

Uniform diffuse distribution obeys Lambert’s cosine law: the light has the same apparent intensity when viewed from any angle.

Uniform diffuse light distribution

NoteUniform Diffuse distribution was known simply as Diffuse distribution in releases prior to Autodesk 3ds Max 2011.