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Fix entities not being visible to clients when teleporting

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When teleporting, the spawn position packet will contain the
old position. Then the following tracking update will send a
teleport packet, but the client will lerp the position change
over 3 ticks. However, the client does not tick entities in
unloaded chunks - resulting in the lerp never occuring.

We fix this by sending the current position in the spawn packet.
This commit is contained in:
Spottedleaf 2024-07-11 08:32:15 -07:00
parent 8b558d9e0b
commit a594d182e4
1 changed files with 27 additions and 0 deletions
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27
patches/server/1037-Fix-entity-tracker-desync-when-new-players-are-added.patch
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@ -20,6 +20,33 @@ Resetting the last sent position every time a new player is
added to the tracker is just easier to do, so that is what
this patch does.
This patch also fixes entities appearing to disappear when
teleporting to players by changing the initial position
in the spawn packet to the entities current tracking position.
When teleporting, the spawn packet will contain the old position
which is most likely in an unloaded chunk - which means that the
client will not tick the entity and thus not lerp the entity
from its old position to its new position.
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
index 1a5e73fd97781f3903e5ef13aa0352c64fbc2cc1..4126d82e83810126eb4a41b4587dc993542f3793 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
@@ -42,9 +42,11 @@ public class ClientboundAddEntityPacket implements Packet<ClientGamePacketListen
this(
entity.getId(),
entity.getUUID(),
- entityTrackerEntry.getPositionBase().x(),
- entityTrackerEntry.getPositionBase().y(),
- entityTrackerEntry.getPositionBase().z(),
+ // Paper start - fix entity tracker desync
+ entity.trackingPosition().x(),
+ entity.trackingPosition().y(),
+ entity.trackingPosition().z(),
+ // Paper end - fix entity tracker desync
entityTrackerEntry.getLastSentXRot(),
entityTrackerEntry.getLastSentYRot(),
entity.getType(),
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index c96740a82eac9101f74edeb44edf4b64d1d633e0..8b6754525fafd1aaac3292cf69a855d6a42b9523 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java