Creating a Flashlight Effect in Mixed Reality using Unity

• Unity Hub
• Visual Studio Code or another code editor
• Mixed Reality Toolkit (MRTK)

Next, add a directional light to the scene to simulate ambient lighting. This will help us see the effects of our flashlight more clearly.

1. Create a new game object to serve as our flashlight. Add a light component to this object.
2. Create a new material and apply it to our flashlight object. This material should have an emissive color set to white or another bright color.
3. Add a mesh filter and renderer to the flashlight object, so we can see its shape in the scene.

Create a new C# script in your Unity project and attach it to our flashlight game object. This script should include variables for the light's intensity and range.

using UnityEngine;

public class Flashlight : MonoBehaviour
{
    public float lightIntensity = 10f;
    public float lightRange = 5f;

    private Light flashlightLight;

    void Start()
    {
        flashlightLight = GetComponent();
    }

    void Update()
    {
        // Adjust the light's intensity based on user input (e.g., mouse wheel or keyboard)
        lightIntensity += Input.GetAxis("Mouse ScrollWheel") * 0.1f;
        flashlightLight.intensity = Mathf.Clamp(lightIntensity, 0f, 100f);

        // Adjust the light's range based on user input
        lightRange += Input.GetAxis("Horizontal") * 0.1f;
        flashlightLight.range = Mathf.Clamp(lightRange, 0f, 10f);
    }
}

This script adjusts the light's intensity and range based on user input, such as mouse wheel or keyboard controls.

1. Import the MRTK package into your Unity project.
2. Create a new MR scene and add the flashlight game object to it.
3. Add an MR camera rig to the scene, so we can see our environment in MR.

Refine the effect as needed to achieve the desired behavior. You may need to adjust variables such as light intensity, range, or color.

• Unity 2018.4 or later
• MixedReality Toolkit (MRTK) package installed in Unity
• Familiarity with C# programming language and Unity's scripting API
• A Windows Mixed Reality (WMR) headset, such as the HP Reverb or Lenovo Explorer

1. Create a new Unity project and add the MRTK package.
2. Create a new scene by going to File > New Scene (or press Ctrl+N).
3. Add a new directional light source to the scene by right-clicking in the Hierarchy panel and selecting "Light" > "Directional Light".
4. Name the directional light "Sunlight".

1. Create a new game object by right-clicking in the Hierarchy panel and selecting "3D Object" > "Sphere".
2. Name the sphere "Flashlight".
3. Add a new light component to the Flashlight object by clicking on the "Add Component" button in the Inspector panel and searching for "Light".
4. Select the "Point Light" option.

1. In the Inspector panel, set the "Range" property of the Point Light component to a value between 1-5.

1. Create a new C# script by right-clicking in the Project panel and selecting "Create" > "C# Script".
2. Name the script "FlashlightController".
3. Attach the FlashlightController script to the Flashlight object.

using UnityEngine;

public class FlashlightController : MonoBehaviour
{
  public Light flashlightLight;
  private bool isFlashlightOn = false;

  void Update()
  {
    if (Input.GetMouseButtonDown(0))
    {
      ToggleFlashlight();
    }
  }

  void ToggleFlashlight()
  {
    isFlashlightOn = !isFlashlightOn;
    flashlightLight.enabled = isFlashlightOn;
  }
}

1. In the Hierarchy panel, find the "MixedRealityController" object.
2. Add the Flashlight object as a child of the MixedRealityController object.

1. Build the Unity project by going to File > Build Settings (or press Ctrl+Shift+B).
2. Select the "Windows Mixed Reality" platform.
3. Create a new build configuration or use an existing one.
4. Click on the "Build" button to start the build process.
5. Run the application by clicking on the "Play" button in the Unity editor or by launching the built executable file.