Using @tool to fill a GridContainer with textures from GridMap MeshLibrary

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1

Godot Version

v4.4.1.stable.official [49a5bc7b6]

Question

Hi, I would like to iterate through all 18 cubes that I have in the mesh library of a grid map and put the preview texture into a grid container, so that I can have an inventory of all cubes in a Minecraft-like project.

So I have tried the following code in my world.gd:

@tool
extends Node3D

@onready var grid_map: GridMap = $GridMap
@onready var grid_container: GridContainer = %GridContainer

@export var generate_previews: bool = false:
	set(value):
		print("generate_previews value: ", value)
		generate_previews = value
		if value:
			generate_item_previews()

func generate_item_previews():
	print("Engine.is_editor_hint(): ", Engine.is_editor_hint())
	if not Engine.is_editor_hint():
		return

	# Remove previous previews if any
	for c in grid_container.get_children():
		grid_container.remove_child(c)

	for item_id in grid_map.mesh_library.get_item_list():
		print("item_id: ", item_id)
		var preview := grid_map.mesh_library.get_item_preview(item_id)
		if preview is Texture2D:
			var tex_rect := TextureRect.new()
			tex_rect.texture = preview
			tex_rect.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
			grid_container.add_child(tex_rect)

And then I do see the “Generate Previews” checkbox in the world.tcsn:

image
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And I do see the 18 preview textures in the same scene in the editor:

image
image2551×1380 295 KB

But when I run my project then the grey Panel and the GridContainer are empty, why? (there is only the 3D hotbar at the bottom, but it is unrelated, please ignore):

image
image1280×720 235 KB

Here is my whole project, thank you:

3

Nevermind, the following code has fixed it for me:

image
image1280×720 260 KB

@tool
extends Node3D

@onready var grid_map: GridMap = $GridMap
@onready var grid_container: GridContainer = %GridContainer

# _ready() is run in the game and in the editor
func _ready() -> void:
	generate_item_previews()

func generate_item_previews():
	# Remove previous previews if any
	for c in grid_container.get_children():
		grid_container.remove_child(c)

	for item_id in grid_map.mesh_library.get_item_list():
		print("generating preview texture for item_id: ", item_id)
		var preview := grid_map.mesh_library.get_item_preview(item_id)
		if preview is Texture2D:
			var tex_rect := TextureRect.new()
			tex_rect.texture = preview
			tex_rect.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
			grid_container.add_child(tex_rect)

Now I just need to find out how to make the parent (grey) Panel and the GridContainer grow for accommodating a variable list of items in the mesh library…