grab translation works but not rotation

ovr-utils/Main.tscn

@@ -21,18 +21,19 @@ target = 1
 overlay_scene = ExtResource( 3 )
 width_meters = 0.1
 
-[node name="OverlayInteraction" parent="OverlayInstance Time" instance=ExtResource( 8 )]
-
 [node name="OverlayInstance Battery" parent="." instance=ExtResource( 1 )]
 transform = Transform( -4.37114e-08, -0.707107, -0.707107, 0, -0.707107, 0.707107, -1, 3.09086e-08, 3.09086e-08, -0.12, 0, 0.1 )
 target = 1
 overlay_scene = ExtResource( 7 )
 
 [node name="OverlayInstance UI demo" parent="." instance=ExtResource( 1 )]
-transform = Transform( -4.37114e-08, -1, -4.37114e-08, 0, -4.37114e-08, 1, -1, 4.37114e-08, 1.91069e-15, 0, 0, -0.25 )
-target = 1
+transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, -0.25 )
+target = 3
 overlay_scene = ExtResource( 5 )
 
 [node name="OverlayInteraction" parent="OverlayInstance UI demo" instance=ExtResource( 8 )]
 
 [node name="XYZ Widget" parent="." instance=ExtResource( 4 )]
+
+[editable path="OverlayInstance UI demo"]
+[editable path="OverlayInstance UI demo/OverlayInteraction"]

ovr-utils/addons/openvr_overlay/interaction/overlay_interaction.gd

@@ -16,6 +16,10 @@ var _cursor_node = preload("res://addons/openvr_overlay/interaction/Cursor.tscn"
 var _right_is_activator = false
 var _left_is_activator = false
 
+var is_moving := false
+var move_grab_pos: Vector3
+var move_grab_rot: Vector3
+
 onready var viewport: Viewport = get_node("../OverlayViewport")
 
 
@@ -34,8 +38,29 @@ func _ready() -> void:
 	_update_target()
 
 
-func _process(delta: float) -> void:
+func _process(_delta: float) -> void:
 	_update_cursor()
+	if is_moving:
+#		var controller_new = _overlay_area.global_transform.inverse() * _active_controller.global_transform
+#		var controller_delta = move_grab_offset.inverse() * controller_new
+#		get_parent().transform = move_start_offset * controller_delta
+		var global_target = move_grab_pos + _active_controller.translation
+		get_parent().translation = global_target - _overlay_area.get_parent().translation
+
+
+func begin_move():
+	if not _active_controller:
+		print("Could not begin moving overlay, no controller active. ", get_parent().name)
+		return
+	is_moving = true
+	# offset from active controller to overlay
+#	move_grab_pos = _active_controller.transform.xform_inv(_overlay_area.global_transform.origin)
+	move_grab_pos = _overlay_area.global_transform.origin - _active_controller.translation
+	move_grab_rot = Vector3()
+
+
+func finish_move():
+	is_moving = false
 
 
 #get canvas position of active controller
@@ -94,6 +119,8 @@ func _on_OverlayArea_entered(body: Node) -> void:
 func _on_OverlayArea_exited(body: Node) -> void:
 	if body.get_node("../../..") != self:
 		return
+	# TEMP
+	if not is_moving:
 		_active_controller = null # TODO revert to other controller if both were touching (edge case)
 	_touch_state = false
 	emit_signal("touch_off")

ovr-utils/addons/openvr_overlay/move_overlay.gd

@@ -0,0 +1,17 @@
+extends Control
+
+
+var ihandler
+
+func _ready() -> void:
+	ihandler = get_viewport().get_node("../OverlayInteraction")
+
+
+func _on_DragButton_button_down() -> void:
+	if ihandler:
+		ihandler.begin_move()
+
+
+func _on_DragButton_button_up() -> void:
+	if ihandler:
+		ihandler.finish_move()

ovr-utils/overlays/UI_demo.tscn

@@ -1,6 +1,8 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=9 format=2]
 
+[ext_resource path="res://addons/openvr_overlay/move_overlay.gd" type="Script" id=1]
 [ext_resource path="res://fonts/OpenSans-Regular.ttf" type="DynamicFontData" id=2]
+[ext_resource path="res://fonts/OpenSans-Bold.ttf" type="DynamicFontData" id=3]
 
 [sub_resource type="DynamicFont" id=1]
 size = 100
@@ -10,6 +12,7 @@ font_data = ExtResource( 2 )
 default_font = SubResource( 1 )
 
 [sub_resource type="StyleBoxFlat" id=3]
+bg_color = Color( 0.419608, 0.419608, 0.419608, 1 )
 border_width_left = 16
 border_width_top = 16
 border_width_right = 16
@@ -17,9 +20,16 @@ border_width_bottom = 16
 border_color = Color( 0, 0.505882, 1, 1 )
 corner_detail = 1
 
+[sub_resource type="StyleBoxFlat" id=4]
+
+[sub_resource type="DynamicFont" id=5]
+size = 64
+font_data = ExtResource( 3 )
+
 [node name="Control" type="Control"]
 anchor_right = 1.0
 anchor_bottom = 1.0
+script = ExtResource( 1 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
@@ -35,12 +45,18 @@ __meta__ = {
 "_edit_use_anchors_": false
 }
 
-[node name="Button" type="Button" parent="."]
-margin_top = 600.0
-margin_right = 315.0
-margin_bottom = 778.0
+[node name="DragButton" type="Button" parent="."]
+margin_left = 335.0
+margin_right = 650.0
+margin_bottom = 143.0
 custom_styles/pressed = SubResource( 3 )
-toggle_mode = true
+custom_styles/normal = SubResource( 4 )
+custom_fonts/font = SubResource( 5 )
+custom_colors/font_color = Color( 0, 0, 0, 1 )
+text = "Drag"
 __meta__ = {
 "_edit_use_anchors_": false
 }
+
+[connection signal="button_down" from="DragButton" to="." method="_on_DragButton_button_down"]
+[connection signal="button_up" from="DragButton" to="." method="_on_DragButton_button_up"]