Algodoo

TC, one portal is blue, and one is orange, it doesnt matter which one you enter or exit, it goes both ways, also, if one of the portals is turned, or if the angle of the ball is different to the portal, then the angle of it coming out must be relative to the other portal, and that is what most of the Kilinich's coding is all about

I caught the hint. I will begin work on it now.

I have never played Portal, neither have I seen this K-Scene you speak of.

So, I will follow my own route.

Portals will be circular, with a very obvious arrow for orienting the thing, in the form of the circle cake and an alt-collider.

I prototyped one major and really long spawning code in onCollide using TC42's onCollide function thing. Very helpful- the script box can actually show the whole code. Unlike the console.

Portals of the same color will be linked both ways, except for some one-way ones, where the exit will be darker.
Blue and orange portals will be completely separate.

Aside from the spawn code, the code is all in nested little scene.my.math functions and little bits of onCollide for deleting the ball and calling the spawn function.

I might even make a few levels to go along with it.

EDIT: Done. I posted it as a scene response. It is a level, so there is a solution. And when you find it, you will find it impossible to miss it.