Added Dart Physics

Scripts/dart.gd

@@ -0,0 +1,50 @@
+extends Node3D
+
+var draggingCollider
+var mousePosition
+var doDrag = false
+
+func _input(event):
+	var intersect
+	
+	if event is InputEventMouse:
+		intersect = get_mouse_intersect(event.position)
+		if intersect: mousePosition = intersect.position 
+		#snap on collider
+		#if intersect: mousePosition = intersect.collider.global_position
+		
+	if event is InputEventMouseButton:
+		var leftButtonPressed = event.button_index == MOUSE_BUTTON_LEFT && event.pressed
+		var leftButtonReleased = event.button_index == MOUSE_BUTTON_LEFT && !event.pressed
+		
+		if leftButtonReleased:
+			doDrag = false
+			drag_and_drop(intersect)
+		elif leftButtonPressed:
+			doDrag = true
+			drag_and_drop(intersect)
+
+
+func _process(delta):
+	if draggingCollider:
+		draggingCollider.global_position = mousePosition
+
+func drag_and_drop(intersect):
+	var canMove = intersect.collider in get_tree().get_nodes_in_group("Dart")
+	if !draggingCollider && doDrag && canMove:
+		draggingCollider = intersect.collider
+	elif draggingCollider:
+		draggingCollider = null
+	
+func get_mouse_intersect(mousePosition):
+	var currentCamera = get_viewport().get_camera_3d()
+	var params = PhysicsRayQueryParameters3D.new()
+	
+	params.from = currentCamera.project_ray_origin(mousePosition)
+	params.to = currentCamera.project_position(mousePosition, 1000)
+	if draggingCollider: params.exclude = [draggingCollider]
+	
+	var worldspace = get_world_3d().direct_space_state
+	var result = worldspace.intersect_ray(params)
+	
+	return result