Triggering actions based on which side of a line is crossed

[Andreas]

Is it possible to trigger two different actions based on which side of the same line is crossed?

 

For example... say I have a platform that goes up and down.  I want it to go up when the player goes on it, and then go back down as soon as he steps off.

 

How could I do this with an ACS script, using an if else statement, for instance?

 

Edited February 10, 2020 by Andreas

[boris]

https://zdoom.org/wiki/LineSide

[Andreas]

Perfect! Works like a charm, thank you ;)