Jonathan de Blok
Check the script from the create camera shelf tool. It has a ctrl-click feature where it creates a cam from the current perspective view. I'm sure there are clues in there..

jsmack
That's pretty standard, expect between 1 and 5 minutes of overhead per task on any renderfarm solution.

Guillaume
Did it work? I received a forum notification by mail, but it seems the message was deleted.

mandrake0
Well mantra doesn't know that it should deliver a black image.
Whenn there is a camera and light in the scene it will try hard to create a masterpeace of a image. Even when it is a black image

ziconic
The display flag is often changed while you are working on a scene and is not a robust way of indicating if an object should be hidden because you don't need it now but might need it in the future. It's probably better to adopt a naming scheme for such objects, e.g. using a prefix like “unused_”. This lets you write “unused_*” for the Exclude Objects param in the Mantra node to ensure that these objects are always ignored.