diff --git a/addons/material_maker/engine/gen_graph.gd b/addons/material_maker/engine/gen_graph.gd
index 4a5310b..f87007f 100644
--- a/addons/material_maker/engine/gen_graph.gd
+++ b/addons/material_maker/engine/gen_graph.gd
@@ -10,5 +10,29 @@ func get_port_source(gen_name: String, input_index: int) -> OutputPort:
 			return OutputPort.new(get_node(c.from), c.from_port)
 	return null
 
-func connect_children(src, src_index : int, dst, dst_index : int):
-	pass
\ No newline at end of file
+func connect_children(from, from_port : int, to, to_port : int):
+	# disconnect target
+	while true:
+		var remove = -1
+		for i in connections.size():
+			if connections[i].to == to.name and connections[i].to_port == to_port:
+				remove = i
+				break
+		if remove == -1:
+			break
+		connections.remove(remove)
+	# create new connection
+	connections.append({from=from.name, from_port=from_port, to=to.name, to_port=to_port})
+	return true
+
+func disconnect_children(from, from_port : int, to, to_port : int):
+	while true:
+		var remove = -1
+		for i in connections.size():
+			if connections[i].from == from.name and connections[i].from_port == from_port and connections[i].to == to.name and connections[i].to_port == to_port:
+				remove = i
+				break
+		if remove == -1:
+			break
+		connections.remove(remove)
+	return true
\ No newline at end of file
diff --git a/addons/material_maker/graph_edit.gd b/addons/material_maker/graph_edit.gd
index 192f12b..ab5d07c 100644
--- a/addons/material_maker/graph_edit.gd
+++ b/addons/material_maker/graph_edit.gd
@@ -47,22 +47,11 @@ func connect_node(from, from_slot, to, to_slot):
 			.disconnect_node(disconnect.node, disconnect.slot, to, to_slot)
 		.connect_node(from, from_slot, to, to_slot)
 		send_changed_signal()
-	var source_list = [ from ]
-	# Check if the new connection creates a cycle in the graph
-	while !source_list.empty():
-		var source = source_list.pop_front()
-		if source == to:
-			#print("cannot connect %s to %s (%s)" % [from, to, source])
-			return false
-		for c in get_connection_list():
-			if c.to == source and source_list.find(c.from) == -1:
-				source_list.append(c.from)
-	send_changed_signal()
-	return true
 
 func disconnect_node(from, from_slot, to, to_slot):
-	.disconnect_node(from, from_slot, to, to_slot)
-	send_changed_signal();
+	if generator.disconnect_children(get_node(from).generator, from_slot, get_node(to).generator, to_slot):
+		.disconnect_node(from, from_slot, to, to_slot)
+		send_changed_signal();
 
 func remove_node(node):
 	var node_name = node.name
diff --git a/addons/material_maker/main_window.gd b/addons/material_maker/main_window.gd
index 7b25a61..8e9516d 100644
--- a/addons/material_maker/main_window.gd
+++ b/addons/material_maker/main_window.gd
@@ -307,7 +307,6 @@ func update_preview_2d(node = null):
 				node = n
 				break
 	if node != null:
-		print(node.name)
 		var source = node.generator.get_shader(0)
 		if source != null:
 			var shader : String = renderer.generate_shader(source)
diff --git a/addons/material_maker/preview.tscn b/addons/material_maker/preview.tscn
index f84c456..3b8d8f6 100644
--- a/addons/material_maker/preview.tscn
+++ b/addons/material_maker/preview.tscn
@@ -1,8 +1,7 @@
-[gd_scene load_steps=14 format=2]
+[gd_scene load_steps=13 format=2]
 
 [ext_resource path="res://addons/material_maker/preview.gd" type="Script" id=1]
 [ext_resource path="res://addons/material_maker/panoramas/park.hdr" type="Texture" id=2]
-[ext_resource path="res://icon.png" type="Texture" id=3]
 
 [sub_resource type="Animation" id=1]
 loop = true
@@ -100,7 +99,6 @@ void fragment() {
 
 [sub_resource type="ShaderMaterial" id=10]
 shader = SubResource( 9 )
-shader_param/tex = ExtResource( 3 )
 
 [node name="Preview" type="ViewportContainer"]
 anchor_left = 1.0
@@ -129,7 +127,7 @@ render_target_clear_mode = 1
 render_target_update_mode = 3
 
 [node name="Objects" type="Spatial" parent="MaterialPreview"]
-transform = Transform( -0.956327, 0, -0.292284, 0, 1, 0, 0.292284, 0, -0.956327, 0, 0, 0 )
+transform = Transform( 0.979431, 0, -0.201756, 0, 1, 0, 0.201756, 0, 0.979431, 0, 0, 0 )
 
 [node name="Cube" type="MeshInstance" parent="MaterialPreview/Objects"]
 mesh = SubResource( 2 )