V-Ray for Unreal - Light bake only selected elements - Longer version
Tutorial about how to light bake only few elements in the scene without baking all the geometries again.
As Fast As Possible version video: • Bake light only selected - Vray Unreal - ASAP
1) Vray bake setting, turn on Export EXR and Override Light Maps
2) Be sure the folder of these two settings exist. If not create a folder in that path or change directory path.
3) Bake the whole scene light to create a lightmap for each geometry in the scene. Each geometry in the scene will have it's own exr file in the folder that rappresents it's own lightmap. Once you have these lightmap you can reuse it for bake only the lightmap you want to change.
4) Copy all the lightmap that you don't want to bake again and paste it in the Override Light Maps folder. Vray will detect all the Lightmaps that there are in these folder and will reuse it if no settings are changed about that geometry/static mesh.
5) Hit again Bake Light
In the scene I've used 3D Model free downloaded from: https://www.designconnected.com/it/
More ufficial info about this setting: https://docs.chaosgroup.com/display/V...