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Set the default target exposure to the minimum value, not 0 (#13562)
# Objective - In particularly dark scenes, auto-exposure would lead to an unexpected darkening of the view. - Fixes #13446. ## Solution The average luminance should default to something else than 0.0 instead, when there are no samples. We set it to `settings.min_log_lum`. ## Testing I was able to reproduce the problem on the `auto_exposure` example by setting the point light intensity to 2000 and looking into the right-hand corner. There was a sudden darkening. Now, the discontinuity is gone. --------- Co-authored-by: Alice Cecile <[email protected]> Co-authored-by: Bram Buurlage <[email protected]>
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