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This should be what you're looking for.

Yeah, I like the idea of having this flag. I've tried a few times to make a projectile bounce/die on a horizon, but it never really worked out.

Curiously, it looks like projectiles only disappear on horizons if they [i]do[/i] have BOUNCEONWALLS. That seems backwards compared to skies, where projectiles disappear if they [i]don't[/i] have BOUNCEONCEILINGS. That one sounds like a bug to me - unless it's also intentional ??

It's intended behavior, yes, since otherwise bouncing projectiles would lose a lot of use in outdoor areas.

A close cousin to the [url=http://zdoom.org/wiki/Actor_flags#SKYEXPLODE]SKYEXPLODE[/url] flag, HORIZONEXPLODE would similarly make projectiles explode when hitting a [url=http://zdoom.org/wiki/Line_Horizon]horizon[/url] instead of vanishing. Normally, projectiles with BOUNCEONWALLS will disappear if they hit a horizon line, but this disappearing behaviour can be problematic in a few cases - for me, it's a problem because i'm using this projectile's death states to limit the number of projectiles you can have on-screen, by accessing the target's inventory.

On that topic, is it intended behaviour that bouncing projectiles don't disappear on skies???