The Arnold log is important, not just for troubleshooting and getting help from us at Solid Angle, but also for understanding what’s going on when Arnold renders your scene.

To get an Arnold log:

1. In Maya, click Render > Render Settings
2. In the Render Using list, click Arnold Renderer
3. Click the Diagnostics tab.
   
4. Set the Verbosity level to at least Warnings + Info
5. Click the File check box to enable file logging (by default, the log file will be saved in the last folder you browsed to with  Maya; see Finding your log file).
6. If you want to be absolutely sure of where to find the log file, click the folder icon beside the Filename box, and select a location for the Arnold log file.
7. Depending on what OS you use, and how you started Maya, the log is also output to the Output Window (Windows) or to the terminal (on OSX and Linux if you started Maya from a terminal)

For batch rendering, Arnold log messages go into mayaRenderLog.

• [Windows] %USERPROFILE%\Documents\maya\mayaRenderLog.txt
• [OSX] ~/Library/Logs/Maya/mayaRender.log
• [Linux] ~/maya/mayaRenderLog.txt