View through

For a proper portal we should be able to
see through the portals in a believable way.

This is done using ScreenCaptureComponents and Render Target textures,
while continuously updating them based on the player’s location and rotation.

Teleportation

It wouldn’t be a portal if not for being able to
teleport the objects traveling through it.

By using a triggerbox and checking the dot product of the travelling object,
it is able to seamlessly teleport it at the right moment.

Copies

One of the many crazy things about portals is how an object halfway through it
exists at two different locations at the same time.

In games this can not be done, but the illusion of it can.

By creating a copy of the object and placing it at a slightly inverted relative location
and rotation at the other portal, the illusion takes form.