Make some kind of entity (and give it a better name than a fish). If it's not actively modeled (eg hit by a photon) then it disappears. It naturally moves away from the player a bit, slightly faster than the player can move. If it hits a wall, it disappears.
Make an achievement for keeping one alive for n seconds.
The goal is to make a node loop that the fish gets trapped in, rather than trapping it in any other way or following it.
Fish should give some visual indication of age, like slowly glow brighter and brighter or something, so that players try this on their own.
Make some kind of entity (and give it a better name than a fish). If it's not actively modeled (eg hit by a photon) then it disappears. It naturally moves away from the player a bit, slightly faster than the player can move. If it hits a wall, it disappears.
Make an achievement for keeping one alive for n seconds.
The goal is to make a node loop that the fish gets trapped in, rather than trapping it in any other way or following it.
Fish should give some visual indication of age, like slowly glow brighter and brighter or something, so that players try this on their own.