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UE4 generate a black lightmap on a simple mesh

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    UE4 generate a black lightmap on a simple mesh

    Hello,

    When I am doing my lightmap generation process, I found a very weird case, with the following OBJ file, I got a black lightmap which is incorrect. But if I rotate the file with large degree, the lightmap will be correct. Really can not understand why, could any one can tell me the reason why I got the black lightmap?

    Thanks,

    Code:
    v  4165.6738 574.1858 2500.0000
    v  4165.6738 -1855.8143 2500.0000
    v  4165.6738 -1855.8143 2680.0000
    v  4160.3970 577.4864 2680.0000
    # 4 vertices
    
    vn -1.0000 0.0000 0.0000
    # 1 vertex normals
    
    vt 0.0000 0.0000 0.0000
    # 1 texture coords
    
    g group
    f 1/1/1 2/1/1 3/1/1
    f 3/1/1 4/1/1 1/1/1
    Last edited by tsung1990; 02-13-2020, 09:15 PM.
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