# pixelCast(origin:direction:length:) Performs a ray cast against all the geometry in the scene for a ray of a given origin, direction, and length. ``` @MainActor @preconcurrency func pixelCast(origin: SIMD3, direction: SIMD3, length: Float = 100) async throws -> PixelCastHit? ``` ## Parameters `origin` The origin of the ray relative to the scene. `direction` The direction of the ray relative to the scene. `length` The length of the ray relative to the scene. ## Return Value A `PixelCastHit`. The hit indicates where the ray, starting at a given point and traveling in a given direction, hit a particular entity in the scene. ## Discussion The method ignores entities that lack a [`ModelComponent`](/documentation/RealityKit/ModelComponent) with a valid mesh. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)