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
| rC Cycles | |||
| rCea15890cfccc Fix T50517: Rendering expecting time is negative | |||
| rB Blender | |||
| rB8ea09252c826 Fix T50517: Rendering expecting time is negative | |||
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).