简易联机实现

player/player.gd

@@ -45,9 +45,21 @@ var _gravity: float = float(ProjectSettings.get_setting("physics/3d/default_grav
 var _yaw: float = 0.0
 var _pitch: float = 0.0
 var _jump_buffer: int = 0
+## 本节点是否由本机玩家操控。由世界节点在生成时设置 authority 决定，见 world/main.gd。
+var _is_local: bool = true
 
 
 func _ready() -> void:
+	_is_local = is_multiplayer_authority()
+	if not _is_local:
+		# 远端玩家只是一具「回放身体」：
+		#   拆掉相机 —— 否则每多一个玩家就多一台 Camera3D 互相抢渲染；
+		#   关掉输入与物理 —— 否则与权威端双重模拟，表现为抖动、漂移、穿地。
+		# 它的 position 与 Body.rotation 由子节点 Sync 同步过来。
+		camera_rig.queue_free()
+		set_physics_process(false)
+		set_process_unhandled_input(false)
+		return
 	_yaw = camera_rig.rotation.y
 	_pitch = clampf(spring_arm.rotation.x, deg_to_rad(pitch_min_deg), deg_to_rad(pitch_max_deg))
 	spring_arm.rotation.x = _pitch
@@ -77,6 +89,8 @@ func set_mouse_captured(captured: bool) -> void:
 
 
 func _physics_process(delta: float) -> void:
+	if not _is_local:
+		return
 	# --- 重力 ---
 	if is_on_floor():
 		if velocity.y < 0.0:

player/player.tscn

@@ -1,6 +1,7 @@
 [gd_scene format=3 uid="uid://bekuuw153mv03"]
 
 [ext_resource type="Script" uid="uid://f5ptp3is4agf" path="res://player/player.gd" id="1_oul6g"]
+[ext_resource type="SceneReplicationConfig" path="res://player/player_sync.tres" id="2_rkbax"]
 
 [sub_resource type="CapsuleShape3D" id="CapsuleShape3D_rkbax"]
 radius = 0.4
@@ -39,3 +40,6 @@ fov = 82.2
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.9, 0)
 mesh = SubResource("CapsuleMesh_g1dw6")
 surface_material_override/0 = SubResource("StandardMaterial3D_yw30f")
+
+[node name="Sync" type="MultiplayerSynchronizer" parent="." unique_id=1979575210]
+replication_config = ExtResource("2_rkbax")

player/player_sync.tres

@@ -0,0 +1,9 @@
+[gd_resource type="SceneReplicationConfig" format=3]
+
+[resource]
+properties/0/path = NodePath(".:position")
+properties/0/spawn = true
+properties/0/replication_mode = 1
+properties/1/path = NodePath("Body:rotation")
+properties/1/spawn = true
+properties/1/replication_mode = 1