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I wonder know the mel arguments for arnoldRender command to render a Maya scene with.
Thank you
No, there's no formal MEL api for MtoA.
For the arnoldRender command (which is implemented in C++ as a custom Maya command), check the Quick Help in the script editor.
With the mtoa plugin loaded, you can use:
help arnoldRender;
Which will print out the supported argument options.
There are slim pickings though. Most annoyingly it doesn't have an argument to give it a target file name, nor does it return the name of a created file.