Is the 'Create Tiles in Non-Transparent Texture Regions' of TileSet Resources available in code?

Darklizard · September 1, 2025, 9:05pm

Godot Version

v4.4.1.stable

Question

I’m trying to automatically create tiles from a texture, but I cannot find how to achieve this in code.

I only see this functionality available in the editor:

dragonforge-dev · September 2, 2025, 4:04am

It might help to know why you are trying to do this. What are you trying to achieve?

Darklizard · September 2, 2025, 4:28am

I want to create tiles from an image loaded by the user.

I get an image from them through a FileDialog, then load the image into the TileAtlasSource. Then the user can set their preferred tile size.

I have some ideas how I can create the tiles manually, but it would be much easier to use the built-in function if it is exposed in some way.

dragonforge-dev · September 2, 2025, 7:02am

Did you check out all the functions in the TileSet, TileSetSource and TileSetAtlasSource classes?

mrcdk · September 2, 2025, 7:09am

There’s nothing fancy. The editor just checks if the pixel is opaque or not for each tile:

github.com/godotengine/godot

editor/scene/2d/tiles/tile_set_atlas_source_editor.cpp

6339f31a0


      
          void TileSetAtlasSourceEditor::_auto_create_tiles() {
          	for (Ref<TileSetAtlasSource> &atlas_source : atlases_to_auto_create_tiles) {
          		if (atlas_source.is_valid()) {
          			Ref<Texture2D> texture = atlas_source->get_texture();
          			if (texture.is_valid()) {
          				Vector2i margins = atlas_source->get_margins();
          				Vector2i separation = atlas_source->get_separation();
          				Vector2i texture_region_size = atlas_source->get_texture_region_size();
          				Size2i grid_size = atlas_source->get_atlas_grid_size();
          				EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
          				undo_redo->create_action(TTR("Create tiles in non-transparent texture regions"));
          				for (int y = 0; y < grid_size.y; y++) {
          					for (int x = 0; x < grid_size.x; x++) {
          						// Check if we have a tile at the coord.
          						Vector2i coords = Vector2i(x, y);
          						if (atlas_source->get_tile_at_coords(coords) == TileSetSource::INVALID_ATLAS_COORDS) {
          							// Check if the texture is empty at the given coords.
          							Rect2i region = Rect2i(margins + (coords * (texture_region_size + separation)), texture_region_size);
          							bool is_opaque = false;
          							for (int region_x = region.get_position().x; region_x < region.get_end().x; region_x++) {

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system · October 2, 2025, 7:09am

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