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Thread: hdri light dots

  1. #1
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    Default hdri light dots

    Hi everyone!

    I have a problem with an interior scene and I do not know how to solve it. I attached a crop of the picture.
    The scene is lit by a vray domelight with a hdri in it. And I get those light dots on my walls. I tried everthing I know to get rid of them but nothing worked. So I am happy for every hint!

    Name:  crop.jpg
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    Scene setup:
    Overall: Gamma 2.2
    Scene light by vray dome light with hdri in it. Multiplier 1,0. Gamma of hdri 0.8. Subdivs 64
    Color mapping: Reinhard; 1,0; 0,05; 2,2. Sub-pixel mapping, clamp output checked
    Image sampler: Adaptive DMC; min subdivs:1; max subdivs:20; Clr Thresh: 0,002
    GI: IR+LC
    IR: min rate: -3; max rate: -1; HSph subdivs: 120; Interp. samples 60
    LC: 1200 subdivs: retrace treshold checked
    Camera: vray physical camera

    The only way I get rid of them is when I check Store with irradiance map in the vray dome light.


    I hope somebody can help me!


    BR
    Alex

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  3. #2
    Junior Member YuriiMurii's Avatar
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    Default

    Hey Alex!

    You should increase MAX subdivs in Antialiasing (AA) tab! Default is 4, 15-20 should work.

    Cheers,
    Yurii
    Last edited by YuriiMurii; 05-28-2013 at 09:30 AM.

  4. #3
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    Default

    Hi Yurii,

    thanks for your help.
    My max subdivs are already set to 20.

    No idea how to get rid of these dots.

    BR
    Alex

  5. #4
    Junior Member YuriiMurii's Avatar
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    I had the same problem and it worked for me, maybe try cranking it up all the way to 100 and see what happens

    Cheers,
    Yurii

  6. #5
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    Would be one possible solution. Maybe.
    But render times would increase dramatically.
    There must be an other solution or problem.

    BR
    Alex

  7. #6
    Junior Member YuriiMurii's Avatar
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    I assume it's because your scene is lit only by hdri. I had the same problem and max subdivs saved my ass, 15 worked for me. I actually saw some guys rendering exteriors with 100, thats why I thought it should work for you here.

    Cheers,
    Yurii

  8. #7
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    I am sure increasing max subdivs would solve the problem. But the rendering time would be enormous. 15 to 25 subdivs is ok. But 100?! I think if people have to use 100 subdivs there is something wrong in the overall scene.
    Sure the hdri is causing that problem. With vraysun there is not such a problem.

    BR
    Alex

  9. #8
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    Ive had problems with domes in the past as well. Have you tried putting the HDRI in the Environment slot? It may be your HDRI file too.. Maybe try a different one and see if you get the same results.

  10. #9
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    Is there some kind of bump in wall material?

  11. #10
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    First check if you are using high res HDRI (if its the one by Peter Guthrie then no need to check)

    render vray light pass and gi pass and if those dots appears in the light pass then you need to check if your light is passing by the window glass; and in that case you can try increasing the refraction subdivisions on that window glass material

    PS: put wire images to understand the scene.

  12. #11
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    Since there is no update from op for awhile now, I guess we won't know what was the cause of the problem and most importantly, the solution.

  13. #12
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    Quote Originally Posted by Dentsu View Post
    Since there is no update from op for awhile now, I guess we won't know what was the cause of the problem and most importantly, the solution.
    Yeah, too bad there is so little response to most of these topics.

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