I'm going to put up a poll for the "instant" vs "short animation" behavior, and whether it's one-way or bidirectional. Please read this before voting - and in particular note that "short animation" is NOT the same thing as the triggered behavior of the teleporters.
Firstly - this is two different matters. That's why I've put options for every
combination, including a "don't care" option. And just to avoid doubt - I will be looking at the votes on each matter individually,
not just looking at which combination has the most votes. Or in other words - when I decide on one-way vs bidirectional, I'll ignore the "instant vs animated" part of the votes when tallying up results; and vice versa.
Instant - This would mean that on the frame where a lemming ("L") enters an in-portal, the lemming is transported on that same frame to the out-portal and immediately continues what he was doing.
Animated - This would mean that on the frame where a lemming ("L") enters an in-portal, the lemming would become "frozen" for a few frames and play a short warping animation - presumably half this animation would occur before being transported, and the other half after. Once this animation finishes, the lemming would go back to what it was doing before as if it was never interrupted. (This would be - in terms of
visuals only - the same way Lemmings 3D handles teleporters.)
This would NOT mean that other lemmings cannot use the portal at the same time - the animation is an attribute of the LEMMING, not the object.Bidirectional - This would mean that if there are a pair of linked portals, A and B, a lemming could enter Portal A to come out of Portal B, and could also enter Portal B to come out of Portal A.
One-way - This would mean that if there are a pair of linked portals, A and B, a lemming could only enter Portal A to come out of Portal B; and could not go back through Portal B to come out at Portal A again.
Also, to be clear about a point raised earlier in the topic:
* Two-way portalling is problematic because we obviously don't want a portalled lemming to warp back on the next frame. If it's possible to get around this problem, then I think it's a good idea -- if the portal is essentially a "wormhole" connecting parts of the level that are not next to each other in normal space, then it would make sense for it to be two-way.
This can absolutely be dealt with - NeoLemmix already has to deal with this situation for splitters.