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The Diffuse tab is part of the VRay V-Ray Material parameters.

Diffuse

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Shading Model

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Diffuse

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Example: Diffuse Roughness

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Opacity

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Column width 57%50% Source – Specifies the source of the opacity for the material. Default – The RGB channel from the currently attached texture is used for opacity. This is the default behavior. Alpha from Texture – The alpha channel of the currently attached texture is used for opacity. Alpha from Diffuse – The alpha channel of the texture attached in the Diffuse channel is used as opacity. This option saves additional steps when setting up materials: you can use the Diffuse channel to attach bitmaps with embedded alpha channel for both Diffuse and Opacity. It eliminates the need to use and add the same bitmap in the Opacity channel. Color — Controls the transparency of the material where white is opaque, and black is fully transparent. Texture – Specifies a texture file to be used for the opacity. Mix Strength – Specifies a blend amount for between the texture map and the color.   Column width 5% Column width 38%45% Image Removed

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Self-Illumination

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Column width 57%50% Color –  The The self-illumination color of the material. Brightness – Specifies a multiplier for the self-illumination Color. This is useful for boosting the self-illumination values so that the surface produces stronger illumination with GI. Texture – Specifies a texture file to be used for the color of the self-illumination. Mix Strength – Specifies a blend amount for the texture mapbetween the texture map and the color. Mix Type – Specifies how the texture map and the color mix. Normal – Stacks the texture map on top of the Color. This is the default. Add – Adds the texture map to the Color. Subtract – Subtracts the texture map from the Color. Multiply – Multiplies the texture map by the Color. Self-Illumination Affects GI – When enabled, the self-illumination affects global illumination rays and allows the surface to cast light on nearby objects. Note, however, that it may be more efficient to use area lights or VRayLightMtl material for this effect.  Compensate Camera Exposure – When enabled, the intensity of the Self-Illumination will be is adjusted to compensate the exposure correction from the VRayPhysicalCamera.   Column width 5% Column width 38% Image Removed

 

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Column width 30% UI Text Box size medium See next: V-Ray Material Reflection   Column width 70%