Create fresh material in webcam_display instead of duplicating

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/webcam_display.gd

@@ -18,24 +18,18 @@ var _has_received_frame: bool = false
 
 
 func _ready() -> void:
-	# Get or create the material — duplicate to ensure each instance has its own
-	_material = material_override as StandardMaterial3D
-	if _material != null:
-		_material = _material.duplicate() as StandardMaterial3D
-		material_override = _material
-	else:
-		_material = StandardMaterial3D.new()
-		material_override = _material
-
-	# Configure material for unlit display (no scene lighting affects the webcam feed)
+	# Always create a fresh material — instanced scenes share sub_resources,
+	# so we must not reuse the scene's material or all quads show the same texture
+	_material = StandardMaterial3D.new()
 	_material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
 	_material.albedo_color = default_color
 	_material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	material_override = _material
 
 	# Create initial texture (will be replaced on first frame)
 	_texture = ImageTexture.new()
 
-	print("[WebcamDisplay] Ready, waiting for frames...")
+	print("[WebcamDisplay] %s ready, waiting for frames..." % name)
 
 
 func _process(delta: float) -> void: