From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Lucavon Date: Tue, 23 Jul 2019 20:29:20 -0500 Subject: [PATCH] Configurable projectile relative velocity This patch adds an option "disable relative projectile velocity", which, when nabled, will cause projectiles to ignore the shooter's current velocity, like they did in Minecraft 1.8 and prior. If a player is falling, for example, their shooting range will be drastically reduced, as a downwards velocity is applied to the projectile. This prevents players from saving themselves from falling off floating islands, for example, as a thrown ender pearl will not make it back to the island, while it would have in 1.8. While this could easily be done with plugins, too, there are multiple problems: P1) If multiple plugins cancel the velocity by subtracting the shooter's velocity from the projectile's velocity, the projectile's velocity would be different. As there's no way to detect whether the projectile's velocity has already been adjusted to ignore the player's velocity, plugins can't not do it if it's not necessary. P2) I've noticed some inconsistencies, e.g. weird velocity when shooting while using an elytra. Checking for those inconsistencies is possible, but not as efficient as just not applying the velocity in the first place. P3) Solutions for 1) and especially 2) might not be future-proof, while this server-internal fix makes this change future-proof. diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java index 90e8defde0ef84f3146c8664805d6f11b84c593d..36eff622d5638f1bd11b7b4ebe97036205ccf88b 100644 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java @@ -496,4 +496,9 @@ public class PaperWorldConfig { } log("Anti-Xray: " + (antiXray ? "enabled" : "disabled") + " / Engine Mode: " + engineMode.getDescription() + " / Up to " + ((maxChunkSectionIndex + 1) * 16) + " blocks / Update Radius: " + updateRadius); } + + public boolean disableRelativeProjectileVelocity; + private void disableRelativeProjectileVelocity() { + disableRelativeProjectileVelocity = getBoolean("game-mechanics.disable-relative-projectile-velocity", false); + } } diff --git a/src/main/java/net/minecraft/server/IProjectile.java b/src/main/java/net/minecraft/server/IProjectile.java index 8d26521bc414b3d34f496e966f0c918b023f4833..9f5ce64a60fe7c312399ee416b11b84213dd3bee 100644 --- a/src/main/java/net/minecraft/server/IProjectile.java +++ b/src/main/java/net/minecraft/server/IProjectile.java @@ -114,7 +114,7 @@ public abstract class IProjectile extends Entity { this.shoot((double) f5, (double) f6, (double) f7, f3, f4); Vec3D vec3d = entity.getMot(); - this.setMot(this.getMot().add(vec3d.x, entity.isOnGround() ? 0.0D : vec3d.y, vec3d.z)); + if (!entity.world.paperConfig.disableRelativeProjectileVelocity) this.setMot(this.getMot().add(vec3d.x, entity.isOnGround() ? 0.0D : vec3d.y, vec3d.z)); // Paper - allow disabling relative velocity } protected void a(MovingObjectPosition movingobjectposition) {