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When the V-Ray Light Mix Render Element is added prior to rendering, the intensity and color of lights and of light-emitting materials can be changed directly from the VFB during and after rendering. Lights can be enabled and disabled while rendering without the need to re-render the final output or to navigate to individual lights parameters during Interactive Rendering.

How to Set up Light Mix

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To set the LightMix for use:

  1. Add the LightMix Render Element to your project. (Settings > Channel tab > LightMix rollout).
  2. Then, render the project.
  3. In the new VFB > Layers, set the Source to LightMix. 
  4. Now you can tweak your lights.
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Before rendering, set your lights to white (neutral) color and boost their intensity.

Rendering with lower intensity and then increasing it from the LightMix might produce noise in your render.

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Group by – Specifies how to group the lights into VFB channels:

Family Type – All instances of the same Revit family type are put in a separate channel in the VFB. This means that unique lights are distinguished in separate VFB channels indicating the respective family name and type. 
Individual lights – Each light goes to a separate channel in the VFB indicating the respective family name + element ID. This mode is recommended only for projects with a small amount of lights. 
Light Groups – Creates a separate channel for each group of lights using that light group name. 

Exclude linked lights – When enabled, all lights from a linked Revit file go to an individual VFB channel. When disabled (default), the grouping rule is applied to lights in linked files too.

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