Reason #35 why you should check the Arnold log
In this case, a scene that used to render yesterday, now just resulted in a blue render view, like this:
Anytime the render view doesn’t update when your render, you can be fairly sure there’s some ERROR in the Arnold log.
In this case, the problem was a broken path to the IES file used by a photometric light. In the Arnold log, there was this ERROR:
00:00:04 870MB ERROR | [photometric] can't open C:/Assets/IES/example.ies
It’s easy to say “check the log”, but where do you find the log? It’s not like there’s a nice, color-coded button (red for error) on the render view UI that will pop up the log for you.
- On Windows, you should see the Arnold log in the Output Windows. However, I find that this happens only when I start Maya from the command line. If I start Maya from the Windows Start menu, the Arnold log messages don’t show up in the Output Window. So I have to enable file logging, and check the log file.
- On OSX and Linux, you’ll also have to enable file logging, unless you start Maya from a terminal.
Update: For Google:
- Arnold renders a black screen
- Arnold renders a blue screen