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This page provides information about the Light Select Render Element in V-Ray for Cinema 4D.

 


Overview

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The Light Select Render Element represents the lighting contribution from one or more user-selected lights in the scene. Each Light Select channel can output one of the predetermined contribution types, like the overall direct or indirect illumination or the direct or indirect diffuse or specular contribution to to the illumination. The The Full mode essentially creates a Beauty render for just the included light(s). The Light Path Expression mode allows for custom contributions to be captured. See the Light Path Expressions page for more information.

Multiple Light Select outputs can be rendered for a single scene, and lights may be included in more than one Light Select render element.

By using the Light Select render element, specific lights in the resulting render can be captured and adjusted (color, temperature, brightness, etc.) in a composite without the need to re-render. For example, a Light Select element for all of the backlights in a scene, an artist may adjust the backlighting in the composite , without affecting the rest of the scene's illumination. 


UI Path: ||V-Ray|| > Render Elements > Light Select

 
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How to add a render element to a scene


Options

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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 mapping Mapping 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 provided the Denoiser render element is present.

Mode – Sets what type of lighting contribution is generated in the element as element as follows: 

Direct illumination illumination – Contains diffuse and diffuse and specular information from the specified lights.  
Direct raw – Raw – Lighting within the VRayLightSelect element behaves as a raw render element.
Direct diffuseDiffuse – Lights output only their diffuse contribution and contain no specular information.
Direct specularSpecular – Lights output only their specular contribution and contain no diffuse information.
Full – – Lights provide full output for all information available in the scene, such as GI, SSS, reflection, refraction, etc.
Indirect – Lights output only the indirect scene lighting.
Indirect diffuseDiffuse – Lights output only indirect scene lighting that originated from the diffuse contribution of the specified lights.
Indirect specularSpecular – Lights output indirect scene lighting that originated from the specular contribution of the specified lights.
Subsurface – Lights output only the information calculated from Subsurface Scattering materials.
Light Path Expression – Allows capturing custom light transport paths with regular expressions. 

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The Shadow modes render a color image that works as a reverse mask for shadows caused by a specific light(s). It can be used to lighten, darken, or tint the shadows in post-production.

Direct Diffuse Shadow – Outputs only the shadows cast by objects illuminated by pre-selected lights. This option has the same output as the Shadow render element. 
Direct Specular Shadow – Outputs the specular information from the shadows cast by objects illuminated by a pre-selected light. The objects that the shadows are cast on have to be with reflective material for this channel to be visible.

Light Path Expression – Allows you to enter a Light Path Expression when the Mode is set to Light Path Expression.

Matte Objects Only – When enabled, it renders only the shadows cast on matte objects illuminated by a pre-selected light.

Light Path Expression Builder – Opens the https://lpe-builder.chaosgroup.com/ webpage, available to help you compose expressions and track exactly which ray paths they capture.Include Children – When enabled, any lights that are children of a light from the Light List are included as well.

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Lights List

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Enable the arrow to enter a selection mode. Once enabled, you can select the lights from the viewport.

Emissive materials can also be added to this list. V-Ray respects VRayMtl with non-black self-illumination and VRayLightMtl.

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Notes

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  • When LightMixRE is also added as a render element, make sure to select the Group by Manual light select option. Otherwise, the Light Select channel does not render.