This page provides information about the Light Mix Render Element in V-Ray for SketchUp.
Overview
The Light Mix Render Element provides adjustment control to the lights in the scene from inside the New V-Ray Frame Buffer (VFB2).
When a Light Mix Render Element is added before rendering, the intensity and color of lights and light-emitting materials can be changed directly from the VFB during and after rendering. Lights can be enabled and disabled while rendering without re-rendering the final output or navigating to individual light parameters during Interactive Rendering.
See the Light Mix and Composite or Courseware pages for more information.
UI Paths
||V-Ray Asset Editor|| > Render Elements (right-click) > Light Mix
||V-Ray Asset Editor|| > Create Asset (left-click) > Render Elements > Light Mix
Parameters
Group by – Specifies how to group the lightning information.
Group Instances – If there are instanced lights in the scene, each group has its separate channel.
Individual lights – The lighting information of each light is stored in a separate channel.
Layers – Lighting information for each layer is stored in a separate channel.
Light IDs - If there are lights with the same ID in the scene, each group has its separate channel.
Separate Emissive Materials - When enabled, emissive materials are also included in the VFB LightMix controls together with the scene lights. The materials that V-Ray respects are V-Ray Material with non-black self-illumination and Emissive material.
How to Set up
To set the Light Mix for use:
- Add the Light Mix Render Element to your scene. (Render Settings > Render Elements tab > Add Light Mix)
- Then, render the scene.
- Now, you can tweak your lights!
Rendering with lower intensity and then increasing it from the Light Mix might produce noise in your render.
Before rendering, set your lights to a white (neutral) color and boost their intensity.
LightMix Mode Parameters
When the Source is set to LightMix, you can enable/disable lights and adjust light intensity and color during and after the render. The modifications can be saved as light mix presets and reused. VRayLightMix automatically creates Environment and Self Illumination render elements.
Reset – Resets all changes made to default values.
Save – Saves the changes as a light mix preset.
Load – Loads a light mix preset.
To scene – Applies the current VRayLightMix changes to the scene. It sends all changes to colors/intensities back to the scene lights. This option works only when Group by is set to Group Instances.
To Composite – Sends the Light Selects from LightMix to Composite for additional post adjustments.
Recent – Shows a list of recent light mix presets.
Checkbox – Enables/Disables the selected light.
Multiplier – Specifies an intensity multiplier.
Color Slot – Specifies a color for the selected light.
Examples: Light Mix
The example below shows two different light setups created with the help of Light Mix: daylight and dusk.
The Daylight appearance is achieved by using sunlight and an additional soft light to simulate light coming from the outside. The Dusk appearance is achieved by setting the sun Multiplier to 0, changing the color multiplier of the outside light to blue, increasing the intensity multiplier of all interior lights and tinting them with warmer colors (all ceiling and built-in furniture V-Ray Lights), adjusting the self-illumination multiplier of desk and ceiling lights shaded with V-Ray Light Mtl.
