i think about this easy and cool feature..
to make the region render by adding a mask image and Corona just render the white areas in the mask!
So i don't need the engine to render pixels that i don't need to see at the moment.
it will make the workflow faster ..
example:i just need to edit the material of table in the living while using interactive render.
also if i need make a tweak of a model in the scene in lighting and others but not affecting the other areas i the scene. :)
KR,
Moataz