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Different color when I apply material to geometry box

Hi, I just started to learn UE4 and I got this problem…

https://s32.postimg.org/x1cs3pas1/Ask_Material_Problem.png

How can that happen? Thanks for ur help…

Most likely your lightmap is too low resolution and the darkness is the shadow spreading too far on the object since the pixels will be big. Also make sure your lightmap UV’s are set up well.

Go through these tutorials: https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/