Passthrough Brightness Controller Tutorial

Adjust Passthrough Brightness with the Joystick (Meta Quest 3)

Step by step guide 

1.  Setting up Passthrough

https://www.youtube.com/watch?v=PmDPQe-mnnI

2. Create an empty game object in the Hierarchy and name it PassthroughBrightnessAdjuster

3. Add a component  and create a new script named PassthroughBrightnessAdjuster.cs

•  Uses the right joystick (OVRInput.Axis2D.SecondaryThumbstick.y)

• Smoothly adjusts brightness (no sudden jumps)

4. Open PassthroughBrightnessAdjuster.cs and add script

Final Script: Adjust Brightness with Right Joystick

---

using UnityEngine;

public class PassthroughBrightnessAdjuster : MonoBehaviour

{

    private OVRPassthroughLayer passthroughLayer;

    private float minBrightness = -1.0f; // Darkest setting

    private float maxBrightness = 1.0f;  // Brightest setting

    private float brightnessSpeed = 1.0f; // Adjust speed

    private float currentBrightness = 0.0f; // Default brightness

    void Start()

    {

        // Find the OVRPassthroughLayer in the scene

        passthroughLayer = FindFirstObjectByType<OVRPassthroughLayer>();

        if (passthroughLayer == null)

        {

            Debug.LogError("OVRPassthroughLayer not found! Make sure it's added to Main Camera.");

        }

    }

    void Update()

    {

        if (passthroughLayer != null)

        {

            // Read right joystick Y-axis (UP increases, DOWN decreases brightness)

            float joystickY = OVRInput.Get(OVRInput.Axis2D.SecondaryThumbstick).y;

            if (Mathf.Abs(joystickY) > 0.1f) // Dead zone to prevent unwanted drift

            {

                float newBrightness = Mathf.Clamp(currentBrightness + joystickY * brightnessSpeed * Time.deltaTime, minBrightness, maxBrightness);

                // Apply brightness only if it has changed

                if (Mathf.Abs(newBrightness - currentBrightness) > 0.01f)

                {

                    currentBrightness = newBrightness;

                    passthroughLayer.SetBrightnessContrastSaturation(currentBrightness, 0.0f, 0.0f);

                    Debug.Log($"Passthrough Brightness: {currentBrightness:F2}");

                }

            }

        }

    }

}

 How This Works

 Right Joystick (OVRInput.Axis2D.SecondaryThumbstick.y) Controls Brightness

• Push Up (Y = 1.0f) → Increases brightness

• Push Down (Y = -1.0f) → Decreases brightness

• Dead zone (> 0.1f) → Prevents joystick drift

• Smooth adjustments using Time.deltaTime

Ensure PassthroughBrightnessAdjuster.cs is attached to PassthroughBrightnessAdjuster

Test on Meta Quest 3

1. Connect Meta Quest 3 via USB-C

2. Switch platform to Android (File > Build Settings > Android)

3.  Click "Build & Run"

4. Use the RIGHT JOYSTICK

• Push Up → Increases brightness

• Push Down → Decreases brightness

Added by : Eunjin Hong 2025/02/21