@tool
extends MeshInstance3D

@export_tool_button("Create Square", "Callable") var button_action = generate

func generate():
	var square_mesh := square_array()
	var triangle_mesh := triangle_array()

	var a_mesh := ArrayMesh.new()
	a_mesh.add_blend_shape("Triangle Shape")
	a_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, square_mesh, [triangle_mesh])
	mesh = a_mesh


func square_array() -> Array:
	var vertices := PackedVector3Array([
		Vector3(0, 0, 0),
		Vector3(0, 1, 0),
		Vector3(0, 0, 1),
		Vector3(0, 1, 1),
	])

	var normals := PackedVector3Array([
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
	])

	var indices := PackedInt32Array([
		0, 1, 2,
		3, 2, 1,
	])

	var array = []
	array.resize(Mesh.ARRAY_MAX)
	array[Mesh.ARRAY_VERTEX] = vertices
	array[Mesh.ARRAY_NORMAL] = normals
	array[Mesh.ARRAY_INDEX] = indices

	return array


func triangle_array() -> Array:
	var vertices := PackedVector3Array([
		Vector3(0, 0, -0.2),
		Vector3(0, 1, 0.5),
		Vector3(0, 0, 1.2),
		Vector3(0, 1, 0.5),
	])

	var normals := PackedVector3Array([
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
		Vector3(1, 0, 0),
	])

	var indices := PackedInt32Array([
		0, 1, 2,
		3, 2, 1,
	])

	var array = []
	array.resize(Mesh.ARRAY_MAX)
	array[Mesh.ARRAY_VERTEX] = vertices
	array[Mesh.ARRAY_NORMAL] = normals
	array[Mesh.ARRAY_INDEX] = indices

	return array