Went back to not using a special dummy BugMarker, because it turned out to be less versatile.

Materials/bug_marker.gdshader

@@ -3,7 +3,7 @@
 shader_type spatial;
 render_mode blend_mix,depth_test_disabled,cull_disabled,unshaded;
 
-uniform vec3 colour : source_color = vec3(1.0f, 0.0f, 0.0f);
+uniform vec3 colour : source_color = vec3(1.0f);
 uniform sampler2D msdf_icon : filter_linear_mipmap,hint_default_black;
 uniform float shape_thickness : hint_range(0.0f,1.0f,0.01) = 0.95f;
 uniform vec3 line_colour : source_color = vec3(0.0f);

Scenes/bug_marker.gd

@@ -1,3 +1,4 @@
+class_name BugMarker
 extends Node3D
 
 enum BugStatus { NEUTRAL, UNRESOLVED, IN_PROGRESS, RESOLVED }
@@ -17,14 +18,20 @@ var __billboard_material : ShaderMaterial
 
 
 func _ready() -> void:
-	if __arrow and __billboard:
-		__arrow_material = __arrow.mesh.surface_get_material(0) as ShaderMaterial
-		__billboard_material = __billboard.mesh.surface_get_material(0) as ShaderMaterial
-		__set_marker_status(marker_status)
+	__arrow_material = __arrow.mesh.surface_get_material(0) as ShaderMaterial
+	__billboard_material = __billboard.mesh.surface_get_material(0) as ShaderMaterial
+	set_info_enabled(enable_info)
+	__set_marker_status(marker_status)
 
 
+func set_rotation_to_normal(_normal:Vector3) -> void:
+	global_transform.basis.y = _normal
+	global_transform.basis.x = global_transform.basis.z.cross(_normal)
+	global_transform.basis = global_transform.basis.orthonormalized()
+
 func set_info_enabled(_enable:bool):
-	__info_collider.collision_layer = 0xFFFFFFFF if _enable else 0x00000000
+	if __info_collider:
+		__info_collider.collision_layer = 0xFFFFFFFF if _enable else 0x00000000
 
 
 func __set_marker_status(_status:BugStatus) -> void:

Scenes/bug_marker_dummy.gd

@@ -14,8 +14,3 @@ func _process(_delta:float) -> void:
 		position = Vector3(0.0, 0.0, 0.0)
 	elif follow_node:
 		global_position = follow_node.global_position
-
-func set_rotation_to_normal(_normal:Vector3) -> void:
-	global_transform.basis.y = _normal
-	global_transform.basis.x = global_transform.basis.z.cross(_normal)
-	global_transform.basis = global_transform.basis.orthonormalized()

Scenes/bugbot_player.gd

@@ -4,6 +4,9 @@ extends CharacterBody3D
 ## A controllable bot that marks the location of a bug, and allows writing a bug
 ## report for it.
 
+## Scene to use as the bug marker.
+@export_file("*.scn","*.tscn") var bug_marker : String
+
 ## Distance from camera to allow placing bug markers.
 @export_range(0.0, 100.0, 0.01, "or_greater", "suffix:m") var ray_length : float = 10.0
 
@@ -57,7 +60,7 @@ extends CharacterBody3D
 
 #region Onready
 @onready var __laser_beam : Node3D = $LaserBeamRoot as Node3D
-@onready var __bug_marker_dummy : Node3D = $BugMarkerDummy as Node3D
+@onready var __bug_marker_dummy : BugMarker = $LaserBeamRoot/LaserGlare/BugMarkerDummy as BugMarker
 @onready var __movement_speed_change_timer : Timer = $MovementSpeedChangeTimer as Timer
 @onready var __exit_placement_timer : Timer = $ExitPlacementTimer as Timer
 @onready var __camera : Camera3D = $CollisionShape3D/Camera3D
@@ -261,7 +264,7 @@ func __calculate_movement() -> void:
 
 func __calculate_button_presses() -> void:
 	if Input.is_action_just_pressed(&"bugbot_place_marker") and __raycast_collision:
-		print("Marker placed at ", __raycast_collision["position"])
+		__place_marker(__raycast_collision["position"], __raycast_collision["normal"])
 	
 	if Input.is_action_just_released(&"bugbot_exit_placement"):
 		__exit_placement_timer.stop()
@@ -286,9 +289,18 @@ func __raycast_to_world():
 	else:
 		__laser_beam.visible = false
 
+func __place_marker(_position:Vector3, _normal:Vector3):
+	var marker : BugMarker = (load(bug_marker) as PackedScene).instantiate() as BugMarker
+	get_tree().get_root().add_child(marker)
+	marker.global_position = _position
+	marker.set_rotation_to_normal(_normal)
+	marker.marker_status = BugMarker.BugStatus.UNRESOLVED
+
+
 func __place_dummy_marker():
-	if __raycast_collision:
-		__bug_marker_dummy.set_rotation_to_normal(__raycast_collision["normal"])
-		__bug_marker_dummy.visible = true
-	else:
-		__bug_marker_dummy.visible = false
+	if __bug_marker_dummy:
+		if __raycast_collision:
+			__bug_marker_dummy.set_rotation_to_normal(__raycast_collision["normal"])
+			__bug_marker_dummy.visible = true
+		else:
+			__bug_marker_dummy.visible = false

Scenes/bugbot_player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=41 format=3 uid="uid://dvgain3s4xa4r"]
+[gd_scene load_steps=40 format=3 uid="uid://dvgain3s4xa4r"]
 
 [ext_resource type="Script" path="res://addons/Bugbot/Scenes/bugbot_player.gd" id="1_kdrpa"]
 [ext_resource type="InputEventKey" uid="uid://di5q6d4wt12et" path="res://addons/Bugbot/Inputs/Keyboard/move_forward.res" id="2_jfhdw"]
@@ -34,7 +34,6 @@
 [ext_resource type="InputEventJoypadButton" uid="uid://bc2q8kry856bq" path="res://addons/Bugbot/Inputs/Joystick/place_marker.res" id="32_q7vmk"]
 [ext_resource type="InputEventJoypadButton" uid="uid://8tu5a8nlxgsj" path="res://addons/Bugbot/Inputs/Joystick/exit_placement.res" id="33_lwr38"]
 [ext_resource type="PackedScene" uid="uid://crr6cjploetps" path="res://addons/Bugbot/Scenes/bug_marker.tscn" id="34_jyjbc"]
-[ext_resource type="Script" path="res://addons/Bugbot/Scenes/bug_marker_dummy.gd" id="35_ibing"]
 [ext_resource type="Material" uid="uid://c8b630nfapp8l" path="res://addons/Bugbot/Materials/laser_glow.material" id="35_xqv41"]
 [ext_resource type="Material" uid="uid://dewbda2gd8bgv" path="res://addons/Bugbot/Materials/laser_glare.material" id="36_e4bro"]
 
@@ -60,6 +59,7 @@ motion_mode = 1
 platform_on_leave = 2
 platform_floor_layers = 0
 script = ExtResource("1_kdrpa")
+bug_marker = "res://addons/Bugbot/Scenes/bug_marker.tscn"
 keyboard_move_forward = ExtResource("2_jfhdw")
 keyboard_move_backward = ExtResource("3_0y0pl")
 keyboard_move_left = ExtResource("4_wdhjx")
@@ -93,11 +93,6 @@ joypad_movement_speed_down = ExtResource("31_t01c7")
 joypad_place_marker = ExtResource("32_q7vmk")
 joypad_exit_placement = ExtResource("33_lwr38")
 
-[node name="BugMarkerDummy" type="Node3D" parent="." node_paths=PackedStringArray("follow_node")]
-script = ExtResource("35_ibing")
-bug_marker = ExtResource("34_jyjbc")
-follow_node = NodePath("../LaserBeamRoot/LaserGlare")
-
 [node name="LaserBeamRoot" type="Node3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, -0.5, -0.5, 0)
 
@@ -114,6 +109,9 @@ gi_mode = 0
 mesh = SubResource("QuadMesh_kvipo")
 skeleton = NodePath("../..")
 
+[node name="BugMarkerDummy" parent="LaserBeamRoot/LaserGlare" instance=ExtResource("34_jyjbc")]
+enable_info = false
+
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("SphereShape3D_6gwao")
 debug_color = Color(0.5, 0.7, 1, 1)