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The Diffuse Render Element shows the colors and textures used in materials, flatly applied to objects with no lighting information. The colors are the actual colors set in the material definition, and each texture appears as it does in the texture (file) itself. There are no highlights or shadows, and any every background image is not includedexcluded.

Other render elements that include colors from materials are said to include the diffuse contribution or the diffuse component of the rendered scene. The Diffuse Render Element contributes to this diffuse component; any render element that includes this diffuse component is a combination of vrayRE_Diffuse and other render element(s).

Note that the Diffuse Filter Render Element is affected by reflection and refraction combined weight. 

This render element is, by itself, useful for making overall adjustments and enhancements to base colors and textures during compositing without effecting affecting things like reflections and highlights. 

UI Path: ||V-Ray|| > Render Elements > Diffuse

(How to add a render element to a scene)

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Enable Deep Output –  – Specifies whether to include this render element in deep images.

Color Mapping –  – Applies the color mapping options specified in the Color mappingMapping rollout of the V-Ray tab in the Render Settings window to this render element. This option is enabled by default.

Consider for Anti-Aliasing – When enabled, anti-aliasing is used where possible.

Filtering –  Applies an image filter to this channel.Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.

Vfb Color Corrections – – Applies the post-render color adjustments made from the VFB.

Denoise – Enables the render element's denoising, provided the Denoiser render element is present.

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