More setup and smaller fixes.

game/addons/mesh_data_resource_editor/MDIEd.gd

@@ -237,10 +237,13 @@ func _on_select_all_pressed():
 	_plugin.select_all()
 
 func onhandle_selection_type_front_toggled(on : bool):
+	if on:
 		_plugin.handle_selection_type_front()
 
 func onhandle_selection_type_back_toggled(on : bool):
+	if on:
 		_plugin.handle_selection_type_back()
 
 func onhandle_selection_type_all_toggled(on : bool):
+	if on:
 		_plugin.handle_selection_type_all()

game/addons/mesh_data_resource_editor/MIDGizmo.gd

@@ -197,7 +197,6 @@ func apply() -> void:
 	enable_change_event()
 
 func select_all() -> void:
-	print("asdasd")
 	if _selected_points.size() == _handle_points.size():
 		return
 	
@@ -208,13 +207,22 @@ func select_all() -> void:
 	
 	redraw()
 
-func selection_click_select_through(index, camera, event):
+func selection_click(index, camera, event) -> bool:
+	if handle_selection_type == HandleSelectionType.HANDLE_SELECTION_TYPE_FRONT:
+		return selection_click_select_front_or_back(index, camera, event)
+	elif handle_selection_type == HandleSelectionType.HANDLE_SELECTION_TYPE_BACK:
+		return selection_click_select_front_or_back(index, camera, event)
+	else:
+		return selection_click_select_through(index, camera, event)
+		
+	return false
+
+func selection_click_select_front_or_back(index, camera, event):
 		var gt : Transform = get_spatial_node().global_transform
 		var ray_from : Vector3 = camera.global_transform.origin
 		var gpoint : Vector2 = event.get_position()
 		var grab_threshold : float = 8
 
-		
 		# select vertex
 		var closest_idx : int = -1
 		var closest_dist : float = 1e10
@@ -264,6 +272,120 @@ func selection_click_select_through(index, camera, event):
 
 			redraw()
 
+func selection_click_select_through(index, camera, event):
+		var gt : Transform = get_spatial_node().global_transform
+		var ray_from : Vector3 = camera.global_transform.origin
+		var gpoint : Vector2 = event.get_position()
+		var grab_threshold : float = 8
+
+		# select vertex
+		var closest_idx : int = -1
+		var closest_dist : float = 1e10
+					
+		for i in range(_handle_points.size()):
+			var vert_pos_3d : Vector3 = gt.xform(_handle_points[i])
+			var vert_pos_2d : Vector2 = camera.unproject_position(vert_pos_3d)
+			var dist_3d : float = ray_from.distance_to(vert_pos_3d)
+			var dist_2d : float = gpoint.distance_to(vert_pos_2d)
+						
+			if (dist_2d < grab_threshold && dist_3d < closest_dist):
+				closest_dist = dist_3d
+				closest_idx = i
+
+		if (closest_idx >= 0):
+			for si in range(_selected_points.size()):
+							
+				if _selected_points[si] == closest_idx:
+					if event.alt || event.control:
+						_selected_points.remove(si)
+						return true
+									
+					return false
+						
+			if event.alt || event.control:
+				return false
+						
+			if event.shift:
+				_selected_points.append(closest_idx)
+			else:
+				# Select new point only
+				_selected_points.resize(0)
+				_selected_points.append(closest_idx)
+
+			apply()
+			redraw()
+		else:
+			# Don't unselect all if either control or shift is held down
+			if event.shift || event.control || event.alt:
+				return false
+						
+			if _selected_points.size() == 0:
+				return false
+						
+			#Unselect all
+			_selected_points.resize(0)
+
+			redraw()
+
+func selection_drag(index, camera, event) -> void:
+	if handle_selection_type == HandleSelectionType.HANDLE_SELECTION_TYPE_FRONT:
+		selection_drag_rect_select_front_back(index, camera, event)
+	elif handle_selection_type == HandleSelectionType.HANDLE_SELECTION_TYPE_FRONT:
+		selection_drag_rect_select_front_back(index, camera, event)
+	else:
+		selection_drag_rect_select_through(index, camera, event)
+
+func selection_drag_rect_select_front_back(index, camera, event):
+	var gt : Transform = get_spatial_node().global_transform
+	
+	var mouse_pos : Vector2 = event.get_position()
+	var rect_size : Vector2 = _rect_drag_start_point - mouse_pos
+	rect_size.x = abs(rect_size.x)
+	rect_size.y = abs(rect_size.y)
+	
+	var rect : Rect2 = Rect2(_rect_drag_start_point, rect_size)
+					
+	# This is needed so selection works even when you drag from bottom to top, and from right to left
+	var rect_ofs : Vector2 = _rect_drag_start_point - mouse_pos
+				
+	if rect_ofs.x > 0:
+		rect.position.x -= rect_ofs.x
+						
+	if rect_ofs.y > 0:
+		rect.position.y -= rect_ofs.y
+					
+	var selected : PoolIntArray = PoolIntArray()
+					
+	for i in range(_handle_points.size()):
+		var vert_pos_3d : Vector3 = gt.xform(_handle_points[i])
+		var vert_pos_2d : Vector2 = camera.unproject_position(vert_pos_3d)
+						
+		if rect.has_point(vert_pos_2d):
+			selected.push_back(i)
+						
+	if event.alt || event.control:
+		for isel in selected:
+			for i in range(_selected_points.size()):
+				if _selected_points[i] == isel:
+					_selected_points.remove(i)
+					break
+		redraw()
+						
+		return
+					
+	if event.shift:
+		for isel in selected:
+			if !pool_int_arr_contains(_selected_points, isel):
+				_selected_points.push_back(isel)
+								
+		redraw()
+		return
+						
+	_selected_points.resize(0)
+	_selected_points.append_array(selected)
+					
+	redraw()
+
 func selection_drag_rect_select_through(index, camera, event):
 	var gt : Transform = get_spatial_node().global_transform
 	
@@ -345,9 +467,9 @@ func forward_spatial_gui_input(index, camera, event):
 					had_rect_drag = true
 							
 				if !had_rect_drag:
-					return selection_click_select_through(index, camera, event)
+					return selection_click(index, camera, event)
 				else:
-					selection_drag_rect_select_through(index, camera, event)
+					selection_drag(index, camera, event)
 					# Always return false here, so the drag rect thing disappears in the editor
 					return false
 			else: