Okay, this is hopefully a simple answer that I'm overlooking: If my platform is jumping, I play a jump frame. If he double jumps, though, I'd like to play a different frame. How can I do this? I only see "Is Double Jump Enabled" as a trigger option, which isn't helpful (since it's always enabled). I need something to the extent of "On Double Jump" or something, I feel like, but I don't see anything like that.
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You could always use an instance variable.
On jump, set variable to 1. On jump, if variable =1 - play second jump animation and double jump.
When you land set the variable back to 0.
Something like that should work.