for Godot 4. Drop on a Node2D with polygon2D children, get staticbody2Ds with matching colliders at runtime

MakeCollders.gd

extends Node2D

@export var bake_on_ready: bool = true
@export var remove_source_polygons: bool = true
@export var make_bodies_as_siblings: bool = false # false = bodies become children of this node

func _ready() -> void:
	if bake_on_ready:
		bake_polygons_to_static_bodies()

func bake_polygons_to_static_bodies() -> void:
	# Collect first so we don't iterate a changing tree.
	var polys: Array[Polygon2D] = []
	for c in get_children():
		if c is Polygon2D:
			polys.append(c)

	for src in polys:
		_bake_one(src)

func _bake_one(src: Polygon2D) -> void:
	# Where the new StaticBody2D will live.
	var target_parent: Node = get_parent() if make_bodies_as_siblings else self

	var body := StaticBody2D.new()
	body.name = "%s_Body" % src.name

	# Match the source polygon's transform in the scene.
	# Using global_transform avoids having to reason about parent-space.
	target_parent.add_child(body)
	body.global_transform = src.global_transform

	# --- Collision ---
	var col := CollisionPolygon2D.new()
	col.name = "CollisionPolygon2D"
	col.polygon = src.polygon
	body.add_child(col)

	# --- Visual ---
	var vis := Polygon2D.new()
	vis.name = "Polygon2D"
	vis.polygon = src.polygon
	vis.color = src.color
	vis.texture = src.texture
	vis.texture_offset = src.texture_offset
	vis.texture_rotation = src.texture_rotation
	vis.texture_scale = src.texture_scale
	vis.invert_enabled = src.invert_enabled
	vis.invert_border = src.invert_border
	vis.antialiased = src.antialiased
	# Note: UVs are optional; if you authored them, copy them too.
	vis.uv = src.uv

	body.add_child(vis)

	# Optional: Keep collision/visual aligned with any local offset the source polygon had.
	# Because we set body.global_transform to src.global_transform, we generally want children at identity.
	col.position = Vector2.ZERO
	vis.position = Vector2.ZERO

	if remove_source_polygons:
		src.queue_free()
	else:
		src.visible = false
		src.set_process(false)
		src.set_physics_process(false)