# RealityCoordinateSpaceProjecting A protocol for coordinate spaces that can project 2D points to and from 3D. ``` protocol RealityCoordinateSpaceProjecting ``` ## Topics ### Instance Methods [`func entities(at: CGPoint, in: some CoordinateSpaceProtocol) -> [Entity]`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/entities(at:in:)) Finds all the hit entities when projecting a ray from a starting point. [`func entity(at: CGPoint, in: some CoordinateSpaceProtocol) -> Entity?`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/entity(at:in:)) Finds the first entity hit when projecting a ray from a starting point. [`func hitTest(point: CGPoint, in: some CoordinateSpaceProtocol, query: CollisionCastQueryType, mask: CollisionGroup) -> [CollisionCastHit]`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/hitTest(point:in:query:mask:)) Searches the scene for entities at the specified point in the view. [`func project(point: SIMD3, to: some CoordinateSpaceProtocol) -> CGPoint?`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/project(point:to:)) Projects a point from the 3D world coordinate system of the scene to the 2D pixel coordinate system of the reality view. [`func ray(through: CGPoint, in: some CoordinateSpaceProtocol, to: some RealityCoordinateSpace) -> (origin: SIMD3, direction: SIMD3)?`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/ray(through:in:to:)) Determines the position and direction of a ray through the given point in the 2D space of the view. [`func unproject(CGPoint, from: some CoordinateSpaceProtocol, to: some RealityCoordinateSpace, ontoPlane: float4x4) -> SIMD3?`](/documentation/RealityKit/RealityCoordinateSpaceProjecting/unproject(_:from:to:ontoPlane:)) Unprojects a point from the view onto a plane in 3D world coordinates. ## Relationships ### Conforming Types [`RealityViewCameraContent`](/documentation/RealityKit/RealityViewCameraContent) [`EntityTargetValue`](/documentation/RealityKit/EntityTargetValue) --- 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)