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The Light Mix render element provides adjustment control to the lights in the scene from inside the V-Ray Frame Buffer. When a Light Mix render element has been added before rendering, the intensity and color of the lights and light-emitting materials can be changed directly from the VFB during and after rendering; lights can be enabled or disabled on the go , without the need of to re-rendering render your final output , or navigating navigate to individual lights parameters during IPR. Furthermore, modifications made in the LightMix can be transferred back to the actual lights in the scene with a single click. This feature can handle individual lights as easily as light groups or custom selections.

Read more about LightMix on the Chaos blog.


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Group by – Specifies how to group the lightning information:

Instanced lights – If there are instanced lights in the scene, each group has its separate channel. All unique lights in the scene are stored in their individual render channels;
Individual lights – Lighting information – The lighting information of each light is stored in a separate channel;
Grouped lights – Lighting information – The lighting information of each group of lights is placed in a separate channel. All lights that are not attached to any group in the scene are stored in their individual render channels;
Layers – Lighting information of all layers is stored in a separate channel.
Manual light selects – Render channels are created based on the existing Light Select render elements in the scene. Lights that are not specified there , are collected in a single render channel called Rest. Use this mode when you want to include a Light Select render element to your render, too.

 

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Each grouping mode automatically creates Environment and Self Illumination render elements, and Light Mixing adds them as groups. The information from the light-emitting materials is stored in the Self Illumination channel, while the Environment info is stored in the Environment channel.

Separate Emissive Material – When enabled, illuminating materials are also included in the VFB LightMix controls together with scene lights. The materials which that V-Ray respects are: VRayMtl with non-black self-illumination and VRayLightMtl.

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3. In the new VFB > Layers, set the Source to LightMix. 

4. Now, you can tweak your lights!


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Be careful when renaming lights. If multiple lights have the same name, the Light Mix render element overwrites any saved outcomes.

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