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Event IEventManager
IBlockEvent IEventCancelable IEventHasResult IEventPositionable IMinecartEvent IPotionBrewEvent IProcessableEvent IProjectileImpactEvent IEntityEvent IExplosionEvent ILivingEvent IPlayerEvent ITickEvent AnimalTameEvent ArrowLooseEvent ArrowNockEvent BlockBreakEvent BlockHarvestDropsEvent BlockNeighborNotifyEvent BlockPlaceEvent ClientTickEvent CommandEvent CriticalHitEvent CropGrowPostEvent CropGrowPreEvent EnchantmentLevelSetEvent EnderTeleportEvent EntityJoinWorldEvent EntityLivingAttackedEvent EntityLivingDamageEvent EntityLivingDeathEvent EntityLivingDeathDropsEvent EntityLivingEquipmentChangeEvent EntityLivingFallEvent EntityLivingHealEvent EntityLivingHurtEvent EntityLivingJumpEvent EntityLivingSpawnEvent EntityLivingUpdateEvent EntityMountEvent EntityStruckByLightningEvent EntityTravelToDimensionEvent ExplosionDetonateEvent ExplosionStartEvent FarmlandTrampleEvent ItemExpireEvent ItemFishedEvent ItemTossEvent LivingDestroyBlockEvent LivingEntityUseItemEvent LivingExperienceDropEvent LivingKnockBackEvent LootingLevelEvent MinecartCollisionEvent MinecartInteractEvent MobGriefingEvent PlayerAdvancementEvent PlayerAnvilRepairEvent PlayerAnvilUpdateEvent PlayerAttackEntityEvent PlayerBonemealEvent PlayerBreakSpeedEvent PlayerBrewedPotionEvent PlayerChangedDimensionEvent PlayerCloneEvent PlayerCloseContainerEvent PlayerCraftedEvent PlayerDeathDropsEvent PlayerDestroyItemEvent PlayerFillBucketEvent PlayerInteractBlockEvent PlayerInteractEntityEvent PlayerInteractEvent PlayerItemPickupEvent PlayerLeftClickBlockEvent PlayerLoggedInEvent PlayerLoggedOutEvent PlayerOpenContainerEvent PlayerPickupItemEvent PlayerPickupXpEvent PlayerRespawnEvent PlayerRightClickItemEvent PlayerSetSpawnEvent PlayerSleepInBedEvent PlayerSmeltedEvent PlayerTickEvent PlayerUseHoeEvent PlayerVisibilityEvent PortalSpawnEvent PotionBrewPostEvent PotionBrewPreEvent ProjectileImpactArrowEvent ProjectileImpactFireballEvent ProjectileImpactThrowableEvent RenderTickEvent ServerTickEvent SleepingLocationCheckEvent SleepingTimeCheckEvent WorldTickEvent

PlayerVisibility

This event is fired to determine the visibility of a player, i.e., whether or not they are close enough to be noticed by an attacker. The result of this event is used to calculate (with modifiers from Vanilla Minecraft for sneaking, etc) the range a player can get to a creature before that creature sees them.

While this can be used to increase the visibility range (if it were decreased by Minecraft or another mod), it cannot be increased above its maximum value (the standard target distance).

Event Class

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerVisibilityEvent
You can, of course, also import the class before and use that name then.

Event interface extensions

PlayerVisibilityEvent Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

ZenGetters/ZenSetters

The following information can be retrieved/set during the event:

ZenGetterZenSettersType
ZenGetter
modifier
ZenSetters
Type
double

ZenMethods

event.modifyVisibility(double value) -> This value cannot be directly set. Calling modifyVisibility with a double value will replace the modifier with the result of modifier * double value.

ZenGetters/ZenSetters/ZenMethods from extensions

The following information can be retrieved/set during the event:

ZenGetterZenSetterType
ZenGetter
player
ZenSetter
Type
IPlayer

From extension of extension

ZenGetterZenSetterType
ZenGetter
entityLivingBase
ZenSetter
Type
IEntityLivingBase