I think the big question we need to ask first is:- Do we really want the portal as well? This should be asked first as we may end up including another object than the portal inseat. If we do not end up including the portal, then we don't need to invest time to make clear guidelines between them.
Also, the portal may not need to be a portal, but rather something else. I don't say I am for or against the portal!- If yes, we need to invest the time and create clear guidelines for both: Vortex and Portal. This ensures they won't get mixed up - I like the idea of the vortex being a rough rift that just sucks everything inside and the portal having a clear border, but that's just a first rough thought.
Vortexes have a "sunny meadow" (or similar) motif on the "other side", as per regular orig/ohno exits. Portals have no such theme.
This could also be a good idea. We may end up needing several differences though.
- After that we can create more refined graphical prototypes and discuss the exact aspects of their workings.