# Select
ModelFun provides various selection tools tailored for different data scenarios and operational needs.
In the **OBJ View**, users can:
* **Hold "Ctrl"** to deselect.
* **Press "Y"** to clear all selections.
* **Press "Delete"** to remove selected triangles.
* **Press "Ctrl + Z"** to undo a deletion.
## 1 Rectangle Select
In the OBJ view, users can select model area using a rectangular selection box.
(*Hold **"Ctrl"** to invert selection within the drawn area.*)
## 2 Polygon Select
Users can draw a polygon by **clicking and dragging the left mouse button**. **Double-click** to finalize the selection.
(*Hold **"Ctrl"** to invert selection within the drawn area.*)
## 3 Lasso Select
By **pressing and holding the left mouse button**, users can freely draw a selection boundary. **Releasing the button** finalizes the selection.
(*Hold **"Ctrl"** to invert selection within the drawn area.*)
## 4 Clear Select
Click the **clear selection** button or press **"Y"** to remove all selections.
## 5 Through Select
Allows selecting model elements that are *behind* the visible surface.
## 6 Flood Select
Selects a connected region without penetrating multiple layers.
