Saving collision polygon as a resource.

Question

How do I save a collision polygon as a resource to be loaded later in code.
I am trying to change the collision polygon of an Area2D when I change the sprite to a different one.

Answer 1

Right click your one of your folders in the File System section of your editor New Resource -> ConvexPolygonShape2D or ConcavePolygonShape2D. Define your polygon in the editor per usual and save the resource. Use a CollisionShape2D not a CollisionPolygon2D and load the polygon resource you created. In code you're probably going to need to do something like this:

var sprite_polygon_dictionary = {}
onready var my_sprite = $Sprite
onready var my_collision_shape = $CollisionShape2D

func load_sprite_dictionary(sprite_texture_array, polygon_paths_array):
    for index in range(sprite_texture_array.size()):
        sprite_polygon_dictionary[sprite_texture_array[index]] = load(polygon_paths_array[index])

func change_to_sprite(sprite):
    var polygon = sprite_polygon_dictionary.get(sprite)
    if polygon:
        my_sprite.set_texture(sprite)
        my_collision_shape.set_shape(polygon)

Comments

When I create a new resource and double click it its not opening in the editor

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It opens in the Inspector panel (default on the right side) like where you would edit positions of nodes in the editor.

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Okay, thanks.

Answer 2

A collision polygon is simply a node that can be saved and instantiated as a scene. If you want to save only the "polygon" property (PoolVector2Array), then I do not know how easy it is to do this without additional file-handling code, but it does not make sense, since only points will remain in the save file anyway, you can make sure of this by saving the node (right-click on the node in the list of scene tab nodes -> save the branch as a scene) and opening the scene in a text editor