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This page provides information on the V-Ray light bake process with V-Ray for Unreal.
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Overview
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Bake Settings
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UI Paths
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Bake Settings
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Below are mentioned all the settings and parameters that modify the quality of the V-Ray Bake from the V-Ray Bake Settings tab and the V-Ray Settings tab.
V-Ray Bake Settings Tab
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If you have Export EXR optionenabled before the bake afterwards you can rebake only selected actors without the need to bake the whole level. After the initial bake you can copy the .exr files from the directory specified in Export EXR Path to the directory specified in Override Light Maps Path. After you made your modifications to the actors (e.g. increase Lightmap resolution) enable Override Light Maps option and then delete the appropriate .exr files (<StaticMeshActor_Name>.exr) from the directory specified in the Override Light Maps Path. When you click the V-Ray Bake button the lightmaps for the actors will be loaded from the Override Light Maps Path folder and only the Actors that do not have according .exr files will be baked. |
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You can use the Export EXR and Override Light Maps options to have a resumabe lightbake. When Export EXR is enabled after each successful atlas bake .exrs are saved in Export EXR Path directory. In cases of a crash or something else you will not lose your progress. Just copy the .exr files from the directory specified in Export EXR Path to the directory specified in Override Light Maps Path and enable the Override Light Maps option. When you click the V-Ray Bake button the baked .exr lightmaps will be loaded from the Override Light Maps Path folder and the bake will continue from when it has stopped. |
V-Ray Settings Tab
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Uncheck Auto Exposure and Auto White Balance for faster bake. |
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Noise Limit – A threshold that determines when to stop refining a pixel. Higher values allow more noise in the image, but the render is faster. Lower values help reduce the noise, but take more time to render. A value of 0.0 traces the entire image unconditionally.
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Subdivs – Determines how many paths are traced from the camera. The actual number of paths is the square of the subdivs (the default 500 subdivs mean that 250,000 paths will be traced from the camera).
Sample Size – Controls the size of the individual light cache samples.
Retrace – Enables retracing of GI near corners. This helps prevent light leaks and flickering. The value specifies the extent to which GI near corners is retraced instead of being read from the light cache. A value of 0.0 disables retracing. A value of 2.0 is good for still images. Higher values will result in more rays traces at render time.
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For better parity between Render and viewport we recommend to use Brute Force as a GI solution |
Textures
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Process Atlases
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Bake Progress
The V-Ray Bake button has five states depending on the process that is currently running:
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Usage Examples
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