---
title: "V-Ray Bake"
canonical: "https://documentation.chaos.com/space/VRAYUNREAL/116558180/V-Ray%20Bake"
format: markdown
---
> ❌ Large Atlas Resolution values speed up light baking but increase memory consumption.

> ⚠️ The number of light map atlases depends on:
> ⚠️ 
> ⚠️ - Actor Light Map resolution
> ⚠️ - Atlas resolution
> ⚠️ - Actor count in the level
> ⚠️ 
> ⚠️ ![LightBakeAtlasResolutionExplained.png](media://cb049e03-c100-450b-bfb5-eff19969d5ad)

> ⚠️ Only Static Meshes that do not have appropriate .*exr* files in the directory specified in the **Override Light Maps** **Path **will be included in the baking process.

> ✅ If you have **Export EXR **option** **enabled 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.

> ✅ 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 *.exr*s 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.