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This page gives an overview of the Specular Render Element and explains how it is used.

 


Overview

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The Specular Render Element isolates the reflected light in the scene.  This This render element is an image that stores specular reflection (highlight) information calculated from the material's reflection value s reflection value in the scene. Specular reflection is defined as the reflection of light from a surface in a single particular reflection, as opposed to a diffuse reflection which is reflected at many angles.

The brighter the area, the more highlight reflection the object exhibits in the render. Specular highlights will be are colored if the Reflection Color parameter of a material is colored.

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Attributes

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UI Path

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The parameters for this render element appear in

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the V-Ray RenderChannelColor

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 render channels node.

 

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

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

Color Mapping – When enabled, the Color Mapping options in the render settings are applied to the current render channel.

Consider For AA – When enabled, anti-aliasing

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is used where possible.

Filtering

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 – Applies the image filter to this channel. Image filter settings are in

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the Image

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 Sampler tab

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 of the Sampler tab

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 of the 

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V-Ray

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 Renderer node.

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

Derive Raw Channels

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 – Generates data in the raw channels by combining the respective color and the filter color channels.

VFB Color Corrections

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 – Applies the post render color adjustments made from the VFB.

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Evaluating the Specular Render Element

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Specular light primarily appears on reflective surfaces with a low incidence angle to a bright surface or light source. Lowering the material's gloss value below 1.0 or increasing the IOR can increase this effect. 


Common Uses

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The Specular Render Element is useful for changing the final image's specular appearance during compositing. Below are a couple of examples of its use.

 

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Specular Render Element

 

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Original Beauty composite

 

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Brightened, Blurred and Tinted Specular Render Element

 

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Brightened and blurred Specular Render Element

 

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Tinted Specular

 

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Brightened, blurred & tinted Specular set to screen mode in composite

 

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In the example, the specular reflections are brightened and tinted with a cooler color. See the render before and after compositing.


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Underlying Compositing Formula

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The Specular Render Element is added as part of the Beauty composite to form the final image.

 

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