Portal rendering

Portal rendering

Post by Stefan Ryb » Fri, 11 Mar 2005 20:33:13


I'm asking myself whether it is possible to render scenes using some
kind of portal rendering to get effects like seeing thru an open door
and see a room but moving around the door makes it disappear. Means if
I look at the open door from the front-right I will see something thru
the door but not see something behind it, kinda portal.

Is that possible? How?

Stefan Rybacki

Portal rendering

Post by Glen » Tue, 05 Apr 2005 18:42:08

Do you mean a Fresnel Material Effect?... (in Maya it's called "facing
ratio").. Where you can
map this to transparency. Then, depending on the angle of the camera you can
see through
doors.. walls.. anything - like X-Ray eyes. Not sure if that answers the


Portal rendering

Post by Stefan Ryb » Sat, 09 Apr 2005 21:29:55

On Mon, 4 Apr 2005 02:42:08 -0700, "Glenn" < XXXX@XXXXX.COM >


Did you see Monster INC? When they opened a door to the children's
bedrooms they can see inside this room when looking from the one side
of the door but walking around the door shows what is real behind the
door which is the room the door is standing in.

Usually it is done by setting the door as portal where viewing is
clipped on that portal so that objects connected to that portal are
only seen thru that portal and are also clipped on it so you'll never
see objects outside that portal.


Portal rendering

Post by Thom Kevin » Sun, 10 Apr 2005 12:58:40

Isn't this actually done with a combination of blue screening and post
processing software such as AfterEffects, Combustion, Motion etc? You make
clips with 3D software but ultimately it is stiched together in post.