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moving platforms can 'steal' actors

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minjaesong
2026-02-09 02:34:49 +09:00
parent 5394f17686
commit 855e0ea12a
1 changed files with 22 additions and 11 deletions
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33
src/net/torvald/terrarum/gameactors/PhysContraption.kt
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@@ -133,18 +133,29 @@ abstract class PhysContraption() : ActorWithBody() {
INGAME.actorNowPlaying?.let { candidates.add(it) }
for (actor in candidates) {
if (!actorsRiding.contains(actor.referenceID) && actor.platformsRiding.isEmpty() && isActorOnTop(actor)) {
mount(actor)
snapRiderToSurface(actor)
// Landing on the contraption kills all vertical velocity.
// controllerV.y must also be zeroed: during a jump-then-fall,
// controllerV.y stays negative (jump impulse) while externalV.y
// goes positive (gravity). Zeroing only externalV.y would leave
// a net upward velocity that immediately triggers dismount.
actor.externalV.y = 0.0
actor.controllerV?.let { it.y = 0.0 }
actor.walledBottom = true
if (actorsRiding.contains(actor.referenceID)) continue
if (!isActorOnTop(actor)) continue
// If already riding another contraption, only steal if this
// surface is strictly above (smaller Y) to prevent oscillation.
if (actor.platformsRiding.isNotEmpty()) {
val currentPlatform = INGAME.getActorByID(actor.platformsRiding[0]) as? PhysContraption
if (currentPlatform != null && hitbox.startY >= currentPlatform.hitbox.startY) continue
// Transfer: remove from old contraption without velocity impulse
currentPlatform?.actorsRiding?.remove(actor.referenceID)
actor.platformsRiding.clear()
}
mount(actor)
snapRiderToSurface(actor)
// Landing on the contraption kills all vertical velocity.
// controllerV.y must also be zeroed: during a jump-then-fall,
// controllerV.y stays negative (jump impulse) while externalV.y
// goes positive (gravity). Zeroing only externalV.y would leave
// a net upward velocity that immediately triggers dismount.
actor.externalV.y = 0.0
actor.controllerV?.let { it.y = 0.0 }
actor.walledBottom = true
}
}