Minor additional work on the BlendTreeEditor.

demo/addons/blendalot/blendalot_main_panel.gd

@@ -1,4 +1,5 @@
 @tool
+class_name BlendalotMainPanel
 extends Control
 
 @onready var blend_tree_graph_edit: GraphEdit = %BlendTreeGraphEdit
@@ -20,6 +21,8 @@ var registered_nodes = [
 
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
+	add_node_popup_menu.clear(true)
+	
 	for node_name in registered_nodes:
 		add_node_popup_menu.add_item(node_name)
 
@@ -62,6 +65,9 @@ func _on_reset_graph_button_pressed() -> void:
 	_reset_editor()
 	_update_editor_from_blend_tree()
 	
+	var graph_rect:Rect2 = blend_tree_graph_edit.get_rect()
+	blend_tree_graph_edit.scroll_offset = graph_rect.size * -0.5 - Vector2(200,0)
+
 
 func _reset_editor():
 	for child in blend_tree_graph_edit.get_children():
@@ -79,6 +85,15 @@ func _reset_editor():
 	selected_nodes = {}
 
 
+func edit_blend_tree(blend_tree_animation_node:BLTAnimationNode):
+	print("Starting to edit blend_tree_animation_node " + str(blend_tree_animation_node))
+	print("Owner: %s" % blend_tree_animation_node)
+	_reset_editor()
+	blend_tree = blend_tree_animation_node
+	
+	_update_editor_nodes_from_blend_tree()
+	_update_editor_connections_from_blend_tree()
+
 func _update_editor_nodes_from_blend_tree():
 	for node_name in blend_tree.get_node_names():
 		var blend_tree_node:BLTAnimationNode = blend_tree.get_node(node_name)
@@ -190,8 +205,9 @@ func _on_blend_tree_graph_edit_begin_node_move() -> void:
 	pass # Replace with function body.
 
 
-func _on_blend_tree_graph_edit_node_selected(node: Node) -> void:
+func _on_blend_tree_graph_edit_node_selected(graph_node: Node) -> void:
-	selected_nodes[node] = node
+	selected_nodes[graph_node] = graph_node
+	EditorInterface.get_inspector().edit(graph_node_to_blend_tree_node[graph_node])
 
 
 func _on_blend_tree_graph_edit_node_deselected(node: Node) -> void:
@@ -203,7 +219,7 @@ func _on_blend_tree_graph_edit_popup_request(at_position: Vector2) -> void:
 	add_node_popup_menu.position = get_screen_position() + get_local_mouse_position()
 	add_node_popup_menu.reset_size()
 	add_node_popup_menu.popup()
-	new_node_position = at_position
+	new_node_position = blend_tree_graph_edit.scroll_offset + at_position
 
 
 func _on_add_node_popup_menu_index_pressed(index: int) -> void:
@@ -220,3 +236,36 @@ func _on_add_node_popup_menu_index_pressed(index: int) -> void:
 		graph_node.position_offset = new_node_position
 	
 	new_node_position = Vector2.INF
+
+
+func _on_blend_tree_graph_edit_delete_nodes_request(nodes: Array[StringName]) -> void:
+	for node_name:StringName in nodes:
+		print("remove node '%s'" % node_name)
+		var blend_tree_node:BLTAnimationNode = blend_tree.get_node(node_name)
+		if blend_tree_node == null:
+			push_error("Cannot delete node '%s': node not found." % node_name)
+			continue
+		
+		var graph_node:GraphNode = blend_tree_node_to_graph_node[blend_tree_node]
+		blend_tree.remove_node(blend_tree_node)
+		blend_tree_node_to_graph_node.erase(blend_tree_node)
+		
+		graph_node_to_blend_tree_node.erase(graph_node)
+		blend_tree_graph_edit.remove_child(graph_node)
+		graph_node.queue_free()
+		
+		blend_tree_graph_edit.clear_connections()
+		
+		if node_name in selected_nodes.keys():
+			selected_nodes.erase(node_name)
+
+
+func _on_blend_tree_graph_edit_disconnection_request(from_node: StringName, from_port: int, to_node: StringName, to_port: int) -> void:
+	print("removing connection")
+	
+	var blend_tree_source_node = blend_tree.get_node(from_node)
+	var blend_tree_target_node = blend_tree.get_node(to_node)
+	var target_port_name = blend_tree_target_node.get_input_names()[to_port]
+	blend_tree.remove_connection(blend_tree_source_node, blend_tree_target_node, target_port_name)
+	
+	blend_tree_graph_edit.disconnect_node(from_node, from_port, to_node, to_port)

demo/addons/blendalot/blendalot_main_panel.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=2 format=3 uid="uid://31c6depvs0y1"]
+[gd_scene format=3 uid="uid://31c6depvs0y1"]
 
 [ext_resource type="Script" uid="uid://dvulvuytt81lw" path="res://addons/blendalot/blendalot_main_panel.gd" id="1_427jg"]
 
@@ -74,6 +74,13 @@ size_flags_vertical = 3
 [node name="AddNodePopupMenu" type="PopupMenu" parent="BlendTreeEditorContainer/Panel" unique_id=2020489213]
 unique_name_in_owner = true
 oversampling_override = 1.0
+item_count = 3
+item_0/text = "BLTAnimationNodeSampler"
+item_0/id = 0
+item_1/text = "BLTAnimationNodeBlend2"
+item_1/id = 1
+item_2/text = "BLTAnimationNodeBlendTree"
+item_2/id = 2
 
 [node name="BlendTreeGraphEdit" type="GraphEdit" parent="BlendTreeEditorContainer/Panel" unique_id=387715755]
 unique_name_in_owner = true
@@ -83,6 +90,7 @@ anchor_right = 1.0
 anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
+right_disconnects = true
 
 [connection signal="pressed" from="BlendTreeEditorContainer/HBoxContainer/ResetGraphButton" to="." method="_on_reset_graph_button_pressed"]
 [connection signal="pressed" from="BlendTreeEditorContainer/HBoxContainer/SaveButton" to="." method="_on_save_button_pressed"]
@@ -92,6 +100,8 @@ grow_vertical = 2
 [connection signal="index_pressed" from="BlendTreeEditorContainer/Panel/AddNodePopupMenu" to="." method="_on_add_node_popup_menu_index_pressed"]
 [connection signal="begin_node_move" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_begin_node_move"]
 [connection signal="connection_request" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_connection_request"]
+[connection signal="delete_nodes_request" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_delete_nodes_request"]
+[connection signal="disconnection_request" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_disconnection_request"]
 [connection signal="end_node_move" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_end_node_move"]
 [connection signal="node_deselected" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_node_deselected"]
 [connection signal="node_selected" from="BlendTreeEditorContainer/Panel/BlendTreeGraphEdit" to="." method="_on_blend_tree_graph_edit_node_selected"]

demo/addons/blendalot/blendalot_plugin.gd

@@ -3,7 +3,7 @@ extends EditorPlugin
 
 const MainPanel = preload("res://addons/blendalot/blendalot_main_panel.tscn")
 
-var main_panel_instance
+var main_panel_instance:BlendalotMainPanel
 
 func _enable_plugin() -> void:
 	# Add autoloads here.
@@ -47,3 +47,10 @@ func _get_plugin_icon():
 
 func _handles(obj: Object) -> bool:
 	return obj is BLTAnimationNodeBlendTree
+
+func _edit(object: Object):
+	if object is BLTAnimationNodeBlendTree:
+		main_panel_instance.edit_blend_tree(object)
+		return
+	
+	print("Cannot (yet) edit object " + str(object))

demo/main.gd

@@ -12,19 +12,6 @@ extends Node3D
 func _ready() -> void:
 	blend_weight_slider.value = 0.5
 
-	var blend_tree: BLTAnimationNodeBlendTree = BLTAnimationNodeBlendTree.new()
-	var output_node: BLTAnimationNodeOutput = blend_tree.get_output_node()
-	var sampler_node_1: BLTAnimationNodeSampler = BLTAnimationNodeSampler.new()
-	
-	sampler_node_1.animation = "animation_library/Walk-InPlace"
-	
-	blend_tree.add_node(sampler_node_1)
-	var result = blend_tree.add_connection(sampler_node_1, output_node, "Input")
-	var anim_graph: BLTAnimationGraph = mixamo_amy_walk_run_synced.get_node("SyncedAnimationGraph")
-	
-	anim_graph.tree_root = blend_tree
-
-
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void:
 	pass

demo/main.tscn

@@ -1,11 +1,10 @@
-[gd_scene load_steps=14 format=3 uid="uid://svj53e2xoio"]
+[gd_scene format=3 uid="uid://svj53e2xoio"]
 
 [ext_resource type="PackedScene" uid="uid://d1xcqdqr1qeu6" path="res://assets/MixamoAmy.glb" id="1_0xm2m"]
 [ext_resource type="Script" uid="uid://bjvgqujpqumj7" path="res://main.gd" id="1_1bvp3"]
 [ext_resource type="AnimationLibrary" uid="uid://dwubn740aqx51" path="res://animation_library.res" id="3_1bvp3"]
 [ext_resource type="AnimationNodeBlendTree" uid="uid://dqy0dgwsm8t46" path="res://animation_tree_walk_limp.tres" id="3_272bh"]
 [ext_resource type="BLTAnimationNodeBlendTree" uid="uid://2qfwr1xkiw0s" path="res://synced_blend_tree_walk_limp.tres" id="4_lquwl"]
-[ext_resource type="BLTAnimationNodeBlendTree" uid="uid://qsk64ax2o47f" path="res://synced_blend_tree_walk_run.tres" id="5_7mycd"]
 [ext_resource type="AnimationNodeBlendTree" uid="uid://vsf71o82lkld" path="res://animation_tree_walk_run.tres" id="6_5vw27"]
 
 [sub_resource type="Theme" id="Theme_272bh"]
@@ -32,6 +31,17 @@ sky = SubResource("Sky_1bvp3")
 tonemap_mode = 2
 glow_enabled = true
 
+[sub_resource type="BLTAnimationNodeSampler" id="BLTAnimationNodeSampler_7mycd"]
+resource_name = "BLTAnimationNodeSampler"
+position = Vector2(149.47485, 361.29053)
+animation = &"animation_library/Walk-InPlace"
+
+[sub_resource type="BLTAnimationNodeBlendTree" id="BLTAnimationNodeBlendTree_272bh"]
+nodes/Output/position = Vector2(602.0149, 281.4305)
+nodes/BLTAnimationNodeSampler/node = SubResource("BLTAnimationNodeSampler_7mycd")
+nodes/BLTAnimationNodeSampler/position = Vector2(149.47485, 361.29053)
+node_connections = ["Output", 0, "BLTAnimationNodeSampler"]
+
 [node name="Main" type="Node3D" unique_id=933302313]
 script = ExtResource("1_1bvp3")
 
@@ -156,13 +166,13 @@ unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.4, 0, 0)
 
 [node name="AnimationPlayer2" type="AnimationPlayer" parent="Characters/MixamoAmyWalkRunSynced" unique_id=1255239074]
+active = false
 libraries/animation_library = ExtResource("3_1bvp3")
 
 [node name="SyncedAnimationGraph" type="BLTAnimationGraph" parent="Characters/MixamoAmyWalkRunSynced" unique_id=1602406394]
 animation_player = NodePath("../AnimationPlayer2")
-tree_root = ExtResource("5_7mycd")
+tree_root = SubResource("BLTAnimationNodeBlendTree_272bh")
 skeleton = NodePath("../Armature/Skeleton3D")
-parameters/BLTAnimationNodeBlend2/blend_amount = 0.4
 
 [connection signal="value_changed" from="UI/MarginContainer/HBoxContainer/BlendWeightSlider" to="." method="_on_blend_weight_slider_value_changed"]
 

demo/project.godot

@@ -12,7 +12,7 @@ config_version=5
 
 config/name="Synced Blend Tree Test"
 run/main_scene="uid://svj53e2xoio"
-config/features=PackedStringArray("4.5", "Forward Plus")
+config/features=PackedStringArray("4.6", "Forward Plus")
 config/icon="res://icon.svg"
 
 [display]