# How to Use a 3D Projector with Portalgraph

While running a Portalgraph application, press the **F12** key to open the settings menu.

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Enter the number of views you want to display in the **View Count** on the right side, then input the screen number where you’d like the Portalgraph display to appear in the **Screen** field.

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If you want to display content in only a part of the screen, specify **Offset** and **Scale** values. Set the offset by considering the bottom-left as (0,0) and the top-right as (1,1), and scale from 0 to 1 (similar to Unity’s camera viewport settings).

**Click Apply to save these settings—changes won’t take effect without clicking Apply. If you change the screen you’re using, you’ll need to restart the application.**

**Advanced Tip** You can specify the same screen for multiple views and divide the screen by adjusting the offset and scale for each view.

**Example:**

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In this example, each view will be displayed in specific sections of screen 2: the top-left, top-right, and bottom-left.

Click **Next** to proceed to the calibration screen for each view.

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From the **3D** dropdown menu, select the 3D format that matches your projector or display device:

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* **Side-By-Side**: Left-right split 3D
* **Top-And-Bottom**: Top-bottom split 3D
* **Anaglyph**: Red-blue 3D glasses; you can select the color separation method from the dropdown on the right.
* **No 3D**: Disables 3D output
* **2 outputs**: Outputs separate left and right eye images to two video outputs. The current screen will display the left-eye image, while the right-eye image will be sent to the screen selected from the **Sub-Screen** dropdown.