well here it is:
The .avi (divx)
The .blend (blender :))
It’s basicly really simple,… when you give a object a material with the ENV setting activated, Blender doesn’t render the material instead it renders the background.
What I did in this .blend file is I added a room with a door,… and added another room just around the original one. The 2nd room I gave a material with the env setting. (see for yourself in the .blend file.
Now this isn’t the best way to do it.
The best way is to create 2 seperate scenes, 1 with the room in it, and one with the door and the rest of the scene in it. Now in the dooropening of that door you simply add a plane and give it a material with the ENV setting.
Now you simply use the sequence editor to render the 2 scenes with a ALPHA over (the plane in the door is rendered as the background, thus usable as alpha).
Hope this helps you out,