To use a tile from an atlas for a `TextureRect` in a `ScrollContainer` in Godot 4.3, follow these steps:

1. **Create or Load a TileSet Atlas**:
   - Import your sprite sheet into Godot and create a `TileSet` resource. Define the tile regions in the `TileSet` editor[3].

2. **Set Up the AtlasTexture**:
   - For each tile you want to use, create an `AtlasTexture` resource. Set its `atlas` property to your sprite sheet and define the `region` to crop the specific tile[4].

3. **Configure the TextureRect**:
   ```gdscript
   var atlas_texture = AtlasTexture.new()
   atlas_texture.atlas = preload("res://path_to_your_spritesheet.png")
   atlas_texture.region = Rect2(x, y, width, height)  # Coordinates of the tile
   $TextureRect.texture = atlas_texture
   ```
   Replace `x`, `y`, `width`, and `height` with the tile's position and dimensions[4].

4. **Add to ScrollContainer**:
   - Place the `TextureRect` inside a container (e.g., `VBoxContainer`) that is a child of the `ScrollContainer`. Ensure the container's size exceeds the `ScrollContainer`'s viewport to enable scrolling[2][5].

**Troubleshooting**:
- If textures don't update after modifying the atlas, avoid using "Make Unique" on `AtlasTexture` instances, as this breaks the link to the original atlas[1].
- For crashes when adding many `TextureRect` nodes, ensure the `ScrollContainer`'s children are properly nested and avoid excessive updates during runtime[5]. 

This approach leverages Godot's `AtlasTexture` to efficiently reuse tiles from a sprite sheet while maintaining scrollable UI elements.

Citations:
[1] https://www.reddit.com/r/godot/comments/12cttew/godot_4_textureatlas_questions/
[2] https://docs.godotengine.org/en/stable/classes/class_scrollcontainer.html
[3] https://docs.godotengine.org/en/stable/tutorials/2d/using_tilesets.html
[4] https://docs.godotengine.org/de/stable/classes/class_atlastexture.html
[5] https://github.com/godotengine/godot/issues/75713
[6] https://www.youtube.com/watch?v=w3jla1fTZuQ
[7] https://docs.godotengine.org/en/4.3/classes/class_atlastexture.html
[8] https://docs.godotengine.org/en/4.3/classes/class_scrollcontainer.html
[9] https://docs.godotengine.org/en/stable/classes/class_texturerect.html
[10] https://www.youtube.com/watch?v=2o_IiotMnls

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Antwort von Perplexity: https://www.perplexity.ai/search/godot-4-3-use-tile-from-atlas-HHNbSG1FRniUTuYX96GNzA?utm_source=copy_output