Upload files to 'scenes/assets/ladder'

scenes/assets/ladder/Ladder.tscn

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+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://scenes/assets/ladder/ladder.gd" type="Script" id=1]
+
+
+
+[sub_resource type="BoxShape" id=1]
+extents = Vector3( 0.25, 1, 0.74966 )
+
+[sub_resource type="CubeMesh" id=2]
+size = Vector3( 0.5, 2, 1.5 )
+
+[sub_resource type="SpatialMaterial" id=3]
+albedo_color = Color( 0.380392, 0.4, 0.447059, 1 )
+
+[node name="Ladder" type="Area"]
+collision_layer = 0
+collision_mask = 2
+script = ExtResource( 1 )
+
+[node name="CollisionShape" type="CollisionShape" parent="."]
+shape = SubResource( 1 )
+
+[node name="Mesh" type="MeshInstance" parent="."]
+cast_shadow = 0
+mesh = SubResource( 2 )
+material/0 = SubResource( 3 )
+[connection signal="body_entered" from="." to="." method="_on_body_entered"]
+[connection signal="body_exited" from="." to="." method="_on_body_exited"]

scenes/assets/ladder/ladder.gd

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+extends Area
+
+# The Player has Physics Collision Layer set to: 
+# Objects (Layer 1) and Player (Layer 2).
+#
+# Ladder Area has Physics Collision Mask set to: Player (Layer 2),
+# which means that it will detect only Players.
+#
+# *You can use Groups or Classes too*
+
+
+func _on_body_entered(body: PhysicsBody) -> void:
+	body.flying = true
+
+
+func _on_body_exited(body: PhysicsBody) -> void:
+	body.flying = false