It is tricky because you also have indirect lighting. | Hacker News

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		amelius on July 30, 2022 \| parent \| context \| favorite \| on: Photogrammetry Guide It is tricky because you also have indirect lighting.

WithinReason on July 30, 2022 [–]

If you subtract the 2 images the indirect lighting gets removed and you're left with only the flash, which depends only on albedo and distance

fake-name on July 31, 2022 | [–]

You're missing secondary reflections.

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