diff --git a/library/objects.json b/library/objects.json
index 76ef21c..053ea6c 100644
--- a/library/objects.json
+++ b/library/objects.json
@@ -2,6 +2,146 @@
   "library_version": 1,
   "note": "Editor-Kopie der offiziellen Bibliotheks-Registry (geschlossener Baukasten, PLAN Entscheidung 20). Quelle: scopedvr-match-server library/objects.json — beim Registrieren neuer Objekte DORT zuerst eintragen und hier synchron ziehen. 'poly' = Referenz-Dreieckszahl (Budget-Rechnung, map_format.md §4 V8); 'collision' = Approximation für Platzhalter-Darstellung im Viewport.",
   "objects": {
+    "air_defense_001": {
+      "poly": 520,
+      "collision": {
+        "shape": "box",
+        "size": [
+          2.653,
+          3.257,
+          7.567
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/air_defense_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Flugabwehr 001"
+    },
+    "air_defense_002": {
+      "poly": 520,
+      "collision": {
+        "shape": "box",
+        "size": [
+          2.653,
+          3.257,
+          7.567
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/air_defense_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Flugabwehr 002"
+    },
+    "air_defense_platform_001": {
+      "poly": 964,
+      "collision": {
+        "shape": "box",
+        "size": [
+          3.544,
+          3.947,
+          12.05
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/air_defense_platform_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Flak-Lafette 001"
+    },
+    "air_defense_platform_002": {
+      "poly": 964,
+      "collision": {
+        "shape": "box",
+        "size": [
+          3.544,
+          3.947,
+          12.05
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/air_defense_platform_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Flak-Lafette 002"
+    },
+    "antenna_001": {
+      "poly": 134,
+      "collision": {
+        "shape": "box",
+        "size": [
+          1.591,
+          4.491,
+          1.203
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/antenna_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Funkantenne 001"
+    },
+    "apc_001": {
+      "poly": 2460,
+      "collision": {
+        "shape": "box",
+        "size": [
+          3.732,
+          3.936,
+          6.939
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/apc_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Transportpanzer 001"
+    },
+    "apc_002": {
+      "poly": 1878,
+      "collision": {
+        "shape": "box",
+        "size": [
+          3.732,
+          3.936,
+          6.939
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/apc_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Transportpanzer 002"
+    },
+    "apc_cap": {
+      "poly": 84,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.799,
+          0.25,
+          0.799
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/apc_cap.glb",
+      "kategorie": "vehicles",
+      "name_de": "TPz-Luke"
+    },
+    "apc_cap_1": {
+      "poly": 84,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.799,
+          0.25,
+          0.799
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/apc_cap_1.glb",
+      "kategorie": "vehicles",
+      "name_de": "TPz-Luke 1"
+    },
+    "apc_weapon": {
+      "poly": 482,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.82,
+          1.163,
+          1.576
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/apc_weapon.glb",
+      "kategorie": "vehicles",
+      "name_de": "TPz-MG"
+    },
     "barracks_001": {
       "poly": 1139,
       "collision": {
@@ -3272,6 +3412,286 @@
         "shape": "none"
       }
     },
+    "tank_001": {
+      "poly": 3734,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.964,
+          2.27,
+          8.842
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 001"
+    },
+    "tank_002": {
+      "poly": 3734,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.964,
+          2.27,
+          8.842
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 002"
+    },
+    "tank_003": {
+      "poly": 3734,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.964,
+          2.27,
+          8.842
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_003.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 003"
+    },
+    "tank_004": {
+      "poly": 3734,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.964,
+          2.27,
+          8.842
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_004.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 004"
+    },
+    "tank_005": {
+      "poly": 3564,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.518,
+          2.309,
+          9.973
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_005.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 005"
+    },
+    "tank_006": {
+      "poly": 3560,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.518,
+          2.309,
+          9.973
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_006.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer 006"
+    },
+    "tank_car_001": {
+      "poly": 778,
+      "collision": {
+        "shape": "box",
+        "size": [
+          2.766,
+          2.45,
+          6.548
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_car_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Radpanzer 001"
+    },
+    "tank_car_002": {
+      "poly": 778,
+      "collision": {
+        "shape": "box",
+        "size": [
+          2.766,
+          2.45,
+          6.548
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_car_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Radpanzer 002"
+    },
+    "tank_gun_001": {
+      "poly": 106,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.761,
+          0.761,
+          4.338
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 001"
+    },
+    "tank_gun_002": {
+      "poly": 106,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.761,
+          0.761,
+          4.338
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 002"
+    },
+    "tank_gun_003": {
+      "poly": 106,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.761,
+          0.761,
+          4.338
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_003.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 003"
+    },
+    "tank_gun_004": {
+      "poly": 106,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.761,
+          0.761,
+          4.338
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_004.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 004"
+    },
+    "tank_gun_005": {
+      "poly": 217,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.764,
+          1.005,
+          4.851
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_005.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 005"
+    },
+    "tank_gun_006": {
+      "poly": 217,
+      "collision": {
+        "shape": "box",
+        "size": [
+          0.764,
+          1.005,
+          4.851
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_gun_006.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzerkanone 006"
+    },
+    "tank_tower_001": {
+      "poly": 1456,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.411,
+          4.173,
+          4.502
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_001.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 001"
+    },
+    "tank_tower_002": {
+      "poly": 1456,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.411,
+          4.173,
+          4.502
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_002.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 002"
+    },
+    "tank_tower_003": {
+      "poly": 1456,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.411,
+          4.173,
+          4.502
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_003.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 003"
+    },
+    "tank_tower_004": {
+      "poly": 1456,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.411,
+          4.173,
+          4.502
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_004.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 004"
+    },
+    "tank_tower_005": {
+      "poly": 861,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.08,
+          3.147,
+          5.624
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_005.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 005"
+    },
+    "tank_tower_006": {
+      "poly": 861,
+      "collision": {
+        "shape": "box",
+        "size": [
+          4.08,
+          3.147,
+          5.624
+        ]
+      },
+      "glb": "res://assets/objekte/military_desert/vehicles/tank_tower_006.glb",
+      "kategorie": "vehicles",
+      "name_de": "Panzer-Turm 006"
+    },
     "tent_001": {
       "poly": 1322,
       "collision": {
diff --git a/library/thumbs/air_defense_001.png b/library/thumbs/air_defense_001.png
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diff --git a/tests/probe_d6_mapbuilder.gd b/tests/probe_d6_mapbuilder.gd
new file mode 100644
index 0000000..d762cf5
--- /dev/null
+++ b/tests/probe_d6_mapbuilder.gd
@@ -0,0 +1,170 @@
+extends SceneTree
+## D6-Beweis (t_31e800f2): Map Builder platziert 3 Fahrzeuge (Panzer + Panzer-Turm
+## aufgesetzt + Transportpanzer) und zeigt die Kollisionsboxen als Drahtgitter
+## (Groesse aus registry `collision.size` — die Deckungsprobe als Bild).
+## Zusaetzlich aufgesetzt: die Panzerkanone, damit sichtbar ist, dass Turm und
+## Kanone an der richtigen Stelle sitzen (Pack-Prefab-Hoehen 1,5929 m / 0,5344 m).
+##
+##   xvfb-run -a /opt/data/home/bin/godot4 --rendering-driver opengl3 --path . \
+##     -s res://tests/probe_d6_mapbuilder.gd
+##
+## Ausgabe: user://probe_d6_mapbuilder.png + Pruefzeilen
+
+const AUSGABE := "user://probe_d6_mapbuilder.png"
+const TURM_RING_Y := 1.5928574
+const KANONE_Y := TURM_RING_Y + 0.53440094
+const KANONE_Z := 1.4340973
+
+const PLATZ := [
+	{"id": "tank_001", "pos": [0.0, 0.0, 0.0], "rot_y_deg": 0.0, "aufsatz": false},
+	{"id": "tank_tower_001", "pos": [0.0, TURM_RING_Y, 0.0], "rot_y_deg": 0.0, "aufsatz": true},
+	{"id": "tank_gun_001", "pos": [0.0, KANONE_Y, KANONE_Z], "rot_y_deg": 0.0, "aufsatz": true},
+	{"id": "apc_001", "pos": [9.5, 0.0, 0.0], "rot_y_deg": 0.0, "aufsatz": false},
+]
+
+const MapDocument := preload("res://src/svmap/map_document.gd")
+
+var vp: SubViewport
+var bauer: Node3D
+var kamera: Camera3D
+var rahmen := 0
+var fehler: Array = []
+
+
+func _initialize() -> void:
+	vp = SubViewport.new()
+	vp.size = Vector2i(1600, 1000)
+	vp.own_world_3d = true
+	vp.render_target_update_mode = SubViewport.UPDATE_ALWAYS
+	root.add_child(vp)
+
+	var env := Environment.new()
+	env.background_mode = Environment.BG_COLOR
+	env.background_color = Color(0.55, 0.62, 0.72)
+	env.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
+	env.ambient_light_color = Color(1, 1, 1)
+	env.ambient_light_energy = 0.85
+	var we := WorldEnvironment.new()
+	we.environment = env
+	vp.add_child(we)
+
+	var sonne := DirectionalLight3D.new()
+	sonne.rotation_degrees = Vector3(-48.0, 35.0, 0.0)
+	sonne.light_energy = 1.2
+	vp.add_child(sonne)
+
+	# Bodenplatte (Terrain-Ersatz): zeigt, dass die Fahrzeuge AUF dem Boden stehen.
+	# Bewusst ein flacher Kasten (nicht PlaneMesh) + unshaded: keine Z-Artefakte
+	# und keine Beleuchtungsflecken im llvmpipe-Renderer.
+	var boden := MeshInstance3D.new()
+	var bm_boden := BoxMesh.new()
+	bm_boden.size = Vector3(90.0, 0.4, 90.0)
+	boden.mesh = bm_boden
+	boden.position = Vector3(0.0, -0.19, 0.0)   # Oberkante y=+0.01: Sand liegt 1 cm ueber der Builder-Bodenebene (kein Z-Kampf)
+	var bmat := StandardMaterial3D.new()
+	bmat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	bmat.albedo_color = Color(0.76, 0.66, 0.44)
+	boden.material_override = bmat
+	vp.add_child(boden)
+
+	# --- der ECHTE Map Builder (gleiche Datei wie der Editor benutzt) ---
+	var manifest: Dictionary = JSON.parse_string(
+			FileAccess.get_file_as_string("res://library/objects.json"))
+	var doc: Dictionary = MapDocument.create_new("D6-Beweis", 256.0, "mittag")
+	doc["objects"] = PLATZ
+	bauer = load("res://src/viewport/map_view_builder.gd").new()
+	vp.add_child(bauer)
+	await process_frame
+	bauer.rebuild(doc, manifest)
+
+	var lib: Dictionary = manifest.get("objects", {})
+	print("Bibliothek: %d Objekte" % lib.size())
+	for i in PLATZ.size():
+		var oid := str(PLATZ[i]["id"])
+		var marker: Node3D = bauer.object_markers[i]
+		if marker == null:
+			fehler.append("%s: kein Marker" % oid)
+			continue
+		var entry: Dictionary = lib.get(oid, {})
+		if entry.is_empty():
+			fehler.append("%s: nicht in der Bibliothek" % oid)
+			continue
+		var col: Dictionary = entry.get("collision", {})
+		var groesse: Array = col.get("size", [0.0, 0.0, 0.0])
+		# Kollisionsbox als Drahtgitter (Fusspunkt: Unterkante y=0 der Platzierung).
+		# 12 Kanten als PRIMITIVE_LINES — `wireframe` gibt es in der
+		# Compatibility-Pipeline nicht (Godot-3-Remap-Warnung).
+		var box := MeshInstance3D.new()
+		var im := ImmediateMesh.new()
+		var mat := StandardMaterial3D.new()
+		mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+		mat.albedo_color = Color(0.0, 1.0, 0.2)
+		im.surface_begin(Mesh.PRIMITIVE_LINES, mat)
+		var h := Vector3(float(groesse[0]), float(groesse[1]), float(groesse[2])) * 0.5
+		var ecken: Array = []
+		for sx in [-1.0, 1.0]:
+			for sy in [-1.0, 1.0]:
+				for sz in [-1.0, 1.0]:
+					ecken.append(Vector3(sx * h.x, sy * h.y, sz * h.z))
+		for a in ecken.size():
+			for b in range(a + 1, ecken.size()):
+				var d: Vector3 = ecken[a] - ecken[b]
+				# Kante = genau eine Achse unterschiedlich
+				var gleich := 0
+				if abs(d.x) < 1e-4:
+					gleich += 1
+				if abs(d.y) < 1e-4:
+					gleich += 1
+				if abs(d.z) < 1e-4:
+					gleich += 1
+				if gleich == 2:
+					im.surface_add_vertex(ecken[a])
+					im.surface_add_vertex(ecken[b])
+		im.surface_end()
+		box.mesh = im
+		box.material_override = mat
+		box.position = Vector3(0.0, float(groesse[1]) * 0.5, 0.0)
+		marker.add_child(box)
+
+		var echt := bool(marker.get_meta("glb"))
+		var mi := marker.get_child(0) as MeshInstance3D
+		var mesh_aabb := mi.mesh.get_aabb() if (mi != null and mi.mesh != null) else AABB()
+		print("%-16s echtesGLB=%-5s aufsatz=%-5s  registry=%.3f/%.3f/%.3f  mesh_aabb=%.3f/%.3f/%.3f  mesh_min_y=%.3f  box_fuss=%.3f"
+				% [oid, str(echt), str(PLATZ[i]["aufsatz"]),
+					float(groesse[0]), float(groesse[1]), float(groesse[2]),
+					mesh_aabb.size.x, mesh_aabb.size.y, mesh_aabb.size.z, mesh_aabb.position.y,
+					marker.position.y])
+		if not echt:
+			fehler.append("%s: rendert nur den Platzhalter (GLB fehlt)" % oid)
+		if abs(mesh_aabb.position.y) > 0.01:
+			fehler.append("%s: Mesh-Unterkante %.3f (soll 0)" % [oid, mesh_aabb.position.y])
+
+	# Turm muss exakt auf dem Turm-Ring des Panzers sitzen (Pack-Prefab-Wert).
+	var turm: Node3D = bauer.object_markers[1]
+	if turm != null and abs(turm.position.y - TURM_RING_Y) > 0.001:
+		fehler.append("Turm sitzt bei y=%.4f (Pack-Prefab: %.4f)" % [turm.position.y, TURM_RING_Y])
+
+	kamera = Camera3D.new()
+	kamera.fov = 42.0
+	kamera.current = true
+	vp.add_child(kamera)
+
+
+func _process(_delta: float) -> bool:
+	rahmen += 1
+	if rahmen < 4:
+		return false
+	if rahmen == 4:
+		kamera.look_at_from_position(Vector3(16.0, 9.0, 20.0), Vector3(3.0, 2.4, 0.0), Vector3.UP)
+		return false
+	if rahmen == 8:
+		var pfad := ProjectSettings.globalize_path(AUSGABE)
+		var img := vp.get_texture().get_image()
+		img.save_png(pfad)
+		print("Bild: %s (%dx%d)" % [pfad, img.get_width(), img.get_height()])
+		for f in fehler:
+			print("  FEHLER: %s" % f)
+		print("PROBE_D6_MAPBUILDER_%s" % ("FAIL" if not fehler.is_empty() else "OK"))
+		quit(1 if not fehler.is_empty() else 0)
+		return true
+	return false
diff --git a/tests/probe_d6_mapbuilder.gd.uid b/tests/probe_d6_mapbuilder.gd.uid
new file mode 100644
index 0000000..2bd9114
--- /dev/null
+++ b/tests/probe_d6_mapbuilder.gd.uid
@@ -0,0 +1 @@
+uid://c5ejo72vu5bw2