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This page describes the Diffuse Render Element and how it is used to have more control of a final composited image.
Overview
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Attributes
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Common Uses
The Diffuse Render Element is useful for changing the appearance of many passes when it is combined with Raw render passes (like Raw GI, Raw Light, etc.). In the example below, the Diffuse is multiplied by the Raw Global Illumination Render Element to provide the Global Illumination pass. In this way, color correction can be performed upon the raw pass without the actual diffuse colors being changed, making it possible to tint a pass in a realistic way without re-rendering.
The Diffuse is a very useful render element due to the number of raw passes with which it can be combined, giving the ability to manipulate many areas of the render at the composite level. The Diffuse pass can also be color-corrected on its own, as shown in the example below. In this case, a Multi Matte Render Element was used in conjunction with the Diffuse Render Element to isolate the center of the upper ring and change its color from yellow to green without also tinting its lighting or shadowing in any way.
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Diffuse Render Element
with color correction on the center of the upper ring
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Underlying Compositing Formulas
vrayRE_Diffuse x vrayRE_RawGI = GI
vrayRE_Diffuse x vrayRE_Raw_Light = Lighting
vrayRE_Diffuse x Raw Shadow = Shadow
Notes
1 - This means that reflective objects with solid diffuse color appear differently according to the view angle. The actual diffuse color is displayed only if the VRayRawDiffuse Render Element is used. Anchor 1 1