V-Ray Light Bake or just V-Ray Bake is the process of creating lightmaps with complex light interactions and diffuse interreflection using the V-Ray render engine and it's GI and Lighting calculations.
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The light bake quality depends on the following:
the lightmap resolution of the meshes;
the lightmap UVs quality, better unwrapped UVs better bake quality;
the V-Ray settings in the settings tab.
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Note that actors with vrmeshes assigned will not have their lightmaps baked but will still contribute to the scene for shadows and GI
However, it is possible to import a proxy and bake it with a light map, provided the mesh has correct UV mapping.
Select the proxy and go to Static Mesh > Import Settings rollout. Press the Reset to Default button, which converts the proxy to a static mesh. The static mesh can now be baked.
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