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Question Extreme Bright Points in Directional Lightmap

Discussion in 'Global Illumination' started by caogtaa, Sep 6, 2022.

  1. caogtaa

    caogtaa

    Joined:
    Apr 27, 2016
    Posts:
    13
    Hi,

    I found there are some extreme bright points in my scene after baking Lightmap using Directional Mode.
    If I add bloom effect to the camera, bright points looks very bad, as image shown below.
    upload_2022-9-6_17-30-36.png

    In "Directionality" debug view I can see the light direction for this part is almost zero.
    I have checked the w component is small as well.
    upload_2022-9-6_17-38-39.png

    But in fact, the "dominant" light is far away from this area, the direction value should be big.
    upload_2022-9-6_17-52-26.png


    In URP Lit shader, color in lightmap is divied by direction.w, this cause the final color to be very bright.
    upload_2022-9-6_17-47-25.png

    I have some questions:
    1. Light direction is very small, is it expected ?
    2. How to avoid this problem if I don't modify URP Lit ?

    I'm using Unity 2021.3.6
    Can anyone help me? Thank you!
     
    caogtaa, Sep 6, 2022
    #1

  2. kristijonas_unity

    kristijonas_unity

    Unity Technologies

    Joined:
    Feb 8, 2018
    Posts:
    1,080
    These look like NaNs. Do you have any area lights in the scene? Also, are those modular meshes?

    Switching to Non-directional mode in the Lighting settings might be the easiest fix. Otherwise, inspect your lightmap UVs for overlaps, as that could also be a culprit.
     
    kristijonas_unity, Sep 8, 2022
    #2
    caogtaa likes this.

  3. caogtaa

    caogtaa

    Joined:
    Apr 27, 2016
    Posts:
    13
    Thank you for your reply!
    I checked "Stop NaNs" option in camera setting but nothing change.
    There are no area lights.
    They are not modular meshes.

    I found two pipe segments overlapped, one is very bright.
    upload_2022-9-12_23-57-54.png
    I just shift their position a little and rebake the scene, now it looks good.
    Thank you again.
     
    caogtaa, Sep 12, 2022
    #3
    kristijonas_unity likes this.