How do I use DirectionalLight?

To use a DirectionalLight in RealityKit, you can follow the steps outlined in the session "Discover RealityKit APIs for iOS, macOS and visionOS" from WWDC 2024. Here are the key points:

Types of Lights: RealityKit offers three types of lights: spotlight, directional light, and point light. A directional light illuminates all objects in a scene uniformly, simulating sunlight.
Customization: You can customize the color and intensity of the directional light. Additionally, both spotlights and directional lights can cast shadows.
Implementation: You can add lights and shadows either through Swift API in code or through Reality Composer Pro, which provides a UI for tuning lighting behavior.
Example in Swift:
- Create a new light entity.
- Configure the light's properties such as color and intensity.
- Attach the light entity to your scene.

Here is a brief example of how you might set up a directional light in Swift:

import RealityKit

// Create a new directional light entity
let directionalLight = DirectionalLight()

// Customize the light's properties
directionalLight.light.color = .white
directionalLight.light.intensity = 1000

// Optionally, enable shadows
directionalLight.light.isShadowEnabled = true

// Add the light to your scene
let scene = try! Experience.loadScene()
scene.addChild(directionalLight)

For more detailed information, you can refer to the session Discover RealityKit APIs for iOS, macOS and visionOS (17:11).

Relevant Sessions

If you need more specific details or examples, feel free to ask!