The Light Mix render channel provides adjustment control to the lights in the scene from inside the V-Ray Frame Buffer. When a Light Mix render channel 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 to re-render your final output or navigate to individual light parameters during IPR. Furthermore, modifications made in the Light Mix 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.
In the example, you can see how the lights are mixed so that in one instance, it is dusk, with a nice sunset, and in another instance, it is nighttime. These effects were achieved solely by adjusting the lighting.
1. Add the Light Mix render channel to your scene from the View Layer Properties > Render Channels > Light Mix.
2. Open the V-Ray Frame Buffer and start a new render. This will automatically change the Source to Light Mix.
3. Open the Source layer, and in its Properties, you can start adjusting your lights.
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Before rendering, set your lights to a white (neutral) color and boost their intensity.
Rendering with lower intensity and then increasing it from the LightMix might produce noise in your render. If this happens, use the "To Scene" option and re-render the scene.
