How do I use directional lights?

To use directional lights in RealityKit, you can follow the guidance provided 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, similar to sunlight.
Customization: You can customize the color and intensity of directional lights. 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.
- Define the light's transform in code.
- Attach the directional light to the entity.
- Configure the light's properties such as color and intensity.
- Optionally, add a shadow component if you want the light to cast shadows.

For a detailed walkthrough on how to add and configure lights in RealityKit, you can refer to the session Discover RealityKit APIs for iOS, macOS and visionOS (17:07).

Relevant Sessions

These sessions provide comprehensive insights into lighting, including the use of directional lights, image-based lighting, and optimizing lighting for immersive environments.