over shadow appeared after lighting build

Development Rendering
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1

I don’t know what happened. I place a building which was perfectly fine, but then it told me that “Lighting needs to be rebuilt”. So, after I rebuilt the light, the overgrow-shadow appeared

Before

315923-prototype-unreal-editor-9-27-2020-12-25-18-am.jpg
315923-prototype-unreal-editor-9-27-2020-12-25-18-am.jpg1920×1048 398 KB

After

315924-prototype-unreal-editor-9-27-2020-12-26-13-am.jpg
315924-prototype-unreal-editor-9-27-2020-12-26-13-am.jpg1920×1048 385 KB

Can somebody tell me why this happened and how to fix it?

2

Hi!

If your mesh is static and you have static/stationary light in your scene: those meshes needs a light build to get lighting information! What happens is that a map will be produced with the lighting result and “placed on” your mesh…
So you need a lightmap uv channel for your mesh.
In you case your lightmap has too many islands/parts + a low resolution. So the result will be “blocky” and inaccurate.
Try to have the least seams as possible, keep flat areas together… and try a higher resolution lightmap…

3

It worked! Thank you so much.