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# Cut/split a 3D model

The Cut function in the 3D viewer in the File Module lets you cut a 3D model open at a chosen point, so you can see inside the model and inspect what lies behind a wall, a ceiling, or another building element - for example ventilation ducts behind a ceiling panel or pipes inside a wall - without having to isolate or hide elements manually one by one.

|| There is no role restriction on the Cut function. If you have access to open the 3D file, you can use it.

## Cut the model open with Cut

1. Open the 3D model in the **File Module**.
2. Right-click the point in the model where you want to make your cut.
3. Select **Cut** in the menu that opens.

The model is now cut open at the selected point, so you can see inside it.

![Cut the model open with Cut on a 3D model](https://storage.crisp.chat/users/helpdesk/website/-/e/a/2/c/ea2cfd7bb6130800/image_1jypwpi.png)

## Adjust what the cut shows

After making your cut, you can drag the **arrow** to move the cutting plane and control how much of the model is shown or hidden.

1. Click and hold the **arrow**.
2. Drag it until you can see the area of the model you're interested in.

You can adjust the cut as many times as you like while working in the model.

![Adjust a cut on a 3D model](https://storage.crisp.chat/users/helpdesk/website/-/e/a/2/c/ea2cfd7bb6130800/image_vaj1mz.png)