Maya 2009 ; Substract object when rendering

[sama.van]

Hi!

Does someone know if there is a way to substract and object when rendering?

Here is an exemple :

http://a.samavan.com/MayaQuestion_Substract%20when%20rendering.png

Imagine the cube is front of a complete scene, and when rendering the cube will create an empty pixel area...

[Illusions]

Assign the cube the "Use Background" shader.

[sama.van]

Uutch!!! thousand of thanks!!