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Diffuse BSDF — Blender Manual
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Diffuse Shaders — Blender Manual
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Diffuse Shaders — Blender Manual
Manual/Diffuse Shaders - BlenderWiki
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This is a free Diffuse BSDF Shader guide to help Blender users, extract from one of my free PDF guides and YouTube tutorial below, hope you find it useful :) : r/learnblender
Blender tutorial: materials
texturing - Diffuse BSDF texture on cycles doesn't reflect the Hdri in some parts? - Blender Stack Exchange