Search Unity

Question Built in Render Pipeline Global Illumination

Discussion in 'Global Illumination' started by Guedez, Apr 20, 2023.

  1. Guedez

    Guedez

    Joined:
    Jun 1, 2012
    Posts:
    827
    upload_2023-4-20_16-22-13.png
    I am having this weird issue with the global illumination. Windows are not being considered a 'light source' and there is this weird source of light in the ceiling, not to mention everything is completely black despite having ambient lights turned on. What causes it, what should I check for? There are a billion configurations that I don't know what they do and any time I google I only ever find guides on how to bake lighting in HDRP.
    Clarification of my objective: I want that great light bounce effect on windows/doors when my sun moves, everything else is optional. If I could just get that and the rest of the dark areas were 'barely dark at all' it would be great.
     
    Guedez, Apr 20, 2023
    #1

  2. Guedez

    Guedez

    Joined:
    Jun 1, 2012
    Posts:
    827
    It was the auto generated lightmap UVs optimization configurations, it was combining lightmap bridges it should've not.
    The issue is that 90% of my lightmap is being used with tiny stair steps faces while the big atrium floor is being squeezed into a tiny 10x10 square. so the windows are never a 'light source'.
     
    Guedez, Apr 21, 2023
    #2

  3. Pema-Malling

    Pema-Malling

    Unity Technologies

    Joined:
    Jul 3, 2020
    Posts:
    328
    You can control the lightmap layout somewhat by adjusting the scale in lightmap for individual renderers, such as the atrium floor
    upload_2023-4-25_14-8-21.png

    If you want to force renderers onto separate lightmaps, you can do it by assigning them different lightmap parameters with different bake tags
    upload_2023-4-25_14-8-59.png
    upload_2023-4-25_14-9-26.png

    Of course, if the whole building is one single renderer, this won't really help you. That isn't clear to me from the images you've posted. Posting this mostly in case it helps people reading this thread in the future.
     

    Attached Files:

    Pema-Malling, Apr 25, 2023
    #3

  4. Guedez

    Guedez

    Joined:
    Jun 1, 2012
    Posts:
    827
    Yeah, it's a whole building in the same renderer. Makes me wonder how big studios solve these kinds of issues. Do they have the important stuff in an renderer and the countless tiny stair faces in another? This sounds too strange to be how it's done.
     
    Guedez, Apr 27, 2023
    #4

  5. Pema-Malling

    Pema-Malling

    Unity Technologies

    Joined:
    Jul 3, 2020
    Posts:
    328
    In cases like these you should author your own lightmap UVs using a DCC tool. Then you can make the stairs as big in UV-space as they need to be https://docs.unity3d.com/Manual/LightingGiUvs-GeneratingLightmappingUVs.html#providing-own-uvs
     
    Pema-Malling, Apr 27, 2023
    #5
    Guedez likes this.