This page gives information about the Diffuse Filter Render Element, one of the basic render elements used to form many other render elements.
||Render Setup window|| > Render Elements tab > Add button > VRayDiffuseFilter
This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
vrayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
deep output – Specifies whether to include this render element in deep images.
color mapping – Applies the color mapping options specified in the Color mapping rollout of the V-Ray tab in the Render Setup window to this render element. This option is disabled by default.
multiplier – Sets the overall intensity of the render element, where 1.0 is the standard multiplier.
denoise – Specifies whether to denoise this render element.
The Diffuse Filter Render Element is useful for changing the appearance of many passes when it is combined with Raw render passes (like VRayRawGlobalIllumination, VRayRawLighting, etc.). In the example below, the Diffuse Filter is multiplied by the Raw Global Illumination Render Element to provide the Global Illumination element. 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 Filter 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 Filter pass can also be color-corrected on its own, as shown in the example below. In this case, a Multimatte Render Element was used in conjunction with the Diffuse Filter render element to isolate the dangling light and change its color from white to blue without also tinting its lighting or shadowing in any way.
VRayDiffuseFilter x VRayRawGlobalIllumination = VRayGlobalIllumination