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Mix Directional Light Error in Unity 2017

Discussion in 'Global Illumination' started by NestorAlgieri, Aug 12, 2017.

  1. NestorAlgieri

    NestorAlgieri

    Joined:
    Sep 11, 2011
    Posts:
    299
    I have attached a sample project to demonstrate a problem with light mapping in Unity 2017

    1.) Open it with Unity 5.3.4p3:
    2.) Bake it
    3.) toggle the Directional light in the scene

    Result:

    Only Shadow gets turned on and off. This is the correct behavior.

    1.) Open with Unity 2017.1
    2.) Bake it
    3.) toggle the Directional light in the scene

    Result:

    Shadow gets turned on and off. BUT the Light probes and Dynamic Object(sphere) also gets toggled.

    Why did this change in recent version?

    Thx
     

    Attached Files:

    NestorAlgieri, Aug 12, 2017
    #1

  2. AcidArrow

    AcidArrow

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    May 20, 2010
    Posts:
    11,735
    If you no longer have a light active how is the sphere going to receive realtime direct light?
     
    AcidArrow, Aug 12, 2017
    #2

  3. NestorAlgieri

    NestorAlgieri

    Joined:
    Sep 11, 2011
    Posts:
    299
    Try the sample project in the 2 unity versions. See the different behavior.
     
    NestorAlgieri, Aug 12, 2017
    #3

  4. AcidArrow

    AcidArrow

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    Posts:
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    I see, I guess this use case is not exactly covered by the modes.

    If I understand correctly, what you want is for everything to be fully baked and just have dynamic objects cast subtractive shadows and nothing else.
     
    AcidArrow, Aug 16, 2017
    #4

  5. NestorAlgieri

    NestorAlgieri

    Joined:
    Sep 11, 2011
    Posts:
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    Yes. How do I achieve that with Unity 2017? Because for mobile, this performance is now degraded....
     
    NestorAlgieri, Aug 16, 2017
    #5

  6. kemalakay

    kemalakay

    Unity Technologies

    Joined:
    Jul 12, 2016
    Posts:
    224
    Hey @nepoez

    Currently, the difference you see in behaviour of Subtractive mixed mode is by design (for consistency reasons across dynamic and static objects) but I can see the point in your use case. To clarify: you want your static objects to use baked lightmaps only and your dynamic objects to be lit through light probes?

    If this is the case, then you can use a workaround by making your static objects use a shader that ignores direct lighting and dynamic objects sample lighting through light probes with a simple Lambert shader. Is that applicable?
     
    kemalakay, Aug 17, 2017
    #6

  7. NestorAlgieri

    NestorAlgieri

    Joined:
    Sep 11, 2011
    Posts:
    299
    Hi @kemalakay

    You are slightly off. I believe you are under the impression that the directional(mixed) light is lighting the static objects in real-time. That's not the case. For Unity 2017 The directional(mixed) light is lighting the dynamic objects in real-time, casting shadows in real-time, also the dynamic objects are lit by light probes too. This is using enlighten light mapper. If I used Progressive, then you would be correct. This is why I stopped using Progressive because it's even worse for mobile performance for what I need.

    The behavior I want, is what Unity 5.3.4p3 provides where the directional (mixed) light only does one thing in real-time, which is cast shadows from dynamic objects onto static objects. Everything else is baked. So the only thing calculated in real-time is shadows. I use mobile diffuse for shaders for dynamic obj to cast shadow and the static objs to receive shadows.

    Hopefully you can help me solve this!

    Thank you.
     
    NestorAlgieri, Aug 17, 2017
    #7