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Since this morning I can't make any bump map work properly, they always appear pixellized, in OpenEXR format or with 32 bit Float, either in 2.8 or 2.9, it doesn't seem to be the Terminator effect either, so I don't know what I'm missing here, can it be a graphic card problem (even though it used to work fine before)?.

Here is a screenshot of the result:

enter image description here

The file is here:

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  • $\begingroup$ In your screenshot, it looks as though you were using a png-file format for your bumpmap (instead of EXR, as you wrote). Is this intentional? $\endgroup$ Nov 27, 2020 at 12:08
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    $\begingroup$ Have a look at the bump mapping section here docs.blender.org/manual/en/latest/render/eevee/… $\endgroup$
    – lemon
    Nov 27, 2020 at 12:36
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    $\begingroup$ Or confirmed by Brecht developer.blender.org/T58522 $\endgroup$
    – lemon
    Nov 27, 2020 at 12:47
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    $\begingroup$ I'm not aware of all the technical aspects. But the chapter in the documentation is the same since several versions. Procedural inputs are ok, but images have this 2x2 pixelated thing. $\endgroup$
    – lemon
    Nov 27, 2020 at 12:50
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    $\begingroup$ oui français ;) ça marche je vais rédiger une réponse $\endgroup$
    – moonboots
    Nov 30, 2020 at 18:26

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My problem was that my image was 8 bit, it needs to be 16-Bit Float or 32-Bit Float. It won't work either if I paint (or blur) a 8 bit image and convert it to 16 or 32 bit, it needs to be 16 or 32 bit before painting. Also it needs to be PNG, not JPG, and the Image Texture needs to be set to Cubic, not Linear.

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    $\begingroup$ Thanks, compatriote (!! : ) $\endgroup$
    – lemon
    Nov 30, 2020 at 19:13
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    $\begingroup$ et vive la France of course $\endgroup$
    – moonboots
    Nov 30, 2020 at 19:14
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    $\begingroup$ cocorico for the update $\endgroup$
    – L0Lock
    Oct 11, 2022 at 18:47
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    $\begingroup$ @L0Lock Thanks ;) it was a lingering problem and it took me time to find the answer, for a long time I thought Blender was not able to correctly manage b&w image for bump maps $\endgroup$
    – moonboots
    Oct 11, 2022 at 18:57
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    $\begingroup$ BTW, png is fine-ish because it can do 16bis, but ideally you want 32bits if you can, so that would often be tga raw or exr. Though, one way to get away with decent-enough details is to have a map that was made using 32bits and then down sampled to 16 or even 8 bits but with dithering. It will not be as good, but in many cases it's decent. That's often the only thing used in video games that look HQ. $\endgroup$
    – L0Lock
    Oct 11, 2022 at 19:35

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