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rendering expecting time is negative
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System Information
Ubuntu 14.04 (amd64)
Nvidia GT240

Blender Version
Broken: (example: 2.78.4 520afa2962 from 2017-01-24 08:15)

rendering time for complex scene with glass material and big number of samples (1800) cause negative remaining time
progress bar of render stays zero all time of rendering

Event Timeline

Michael Prach (mpracz) renamed this task from rendering time is negative to rendering expecting time is negative.Jan 24 2017, 1:37 PM

This I can confirm. Win 7, latest e5d8c2a build.

I get 2 hours for the 2.78a, but negatives for latest build.

The time remaining feature now is also always broken when progressive refine is turned on.

Either the value is a negative number or the progress bar ticks up to 100 percent when only a small fraction of the total samples have been calculated.

You don't even need to request a .blend file, just do a progressive refine render with a large amount of samples for the default cube. I believe this was broken when Lukas Stockner did a refactor in a bid to improve its accuracy for tiled rendering (but I would rather have it slightly inaccurate than broken).

Joey Ferwerda (TheOnlyJoey) lowered the priority of this task from Needs Triage by Developer to Confirmed, Medium.

Can confirm, will assign to Sergey.