I'm new in maya software so I have a stupid problem and need some help.

I have made a scene with many objects in it and have modeling all in same scene and they are all in different layers. I...

How do I do that? :-))

Sorry but I'm very new in it

I'm just a beginner with Maya. I have problem with rendering. When I put tree from Visor window and render with Maya software render tree appears but when I render it with Mental ray there is no tree...