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I tried implementing my own diffuse irradiance map maker after reading Learn OpenGL > PBR > IBL > Diffuse Irradiance.

It takes an HDR image and makes six HDR cube map. But It keeps making this very bright dots that altogether forms some kind of contour lines. (Almost looks like gamma correction artifact)

Any idea what possibly can cause this kind of artifacts?

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    $\begingroup$ Most likely you are undersampling, and the bright spots occur when one of your samples happens to land on the sun. $\endgroup$
    – Nathan Reed
    Commented Oct 26, 2021 at 5:34
  • $\begingroup$ @NathanReed You were right I was indeed undersampling. I’ll try more-sampling and see how it go. $\endgroup$
    – Ingun전인건
    Commented Oct 26, 2021 at 7:08
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    $\begingroup$ Double check your sampling pattern and make sure you're getting well distributed samples as you increase the number? You could also try scaling down the input HDRI, so that you don't need so many samples when building the diffuse maps. $\endgroup$
    – Nathan Reed
    Commented Oct 26, 2021 at 15:32
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    $\begingroup$ That doesn't sound right. Can you point to where they're doing that in the article? $\endgroup$
    – Nathan Reed
    Commented Jan 31, 2022 at 16:48
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    $\begingroup$ @NathanReed Nevermind, I was wrong. They turn HDR into LDR only when they are rendering the skybox. 😅 $\endgroup$
    – Ingun전인건
    Commented Feb 1, 2022 at 1:42

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