# CoordinateSpace3D A type that represents a coordinate space which you can use to convert values to and from other coordinate spaces. ``` protocol CoordinateSpace3D ``` ## Topics ### Associated Types [`associatedtype AncestorCoordinateSpace : CoordinateSpace3D`](/documentation/Spatial/CoordinateSpace3D/AncestorCoordinateSpace) ### Instance Properties [`var ancestorSpace: Self.AncestorCoordinateSpace?`](/documentation/Spatial/CoordinateSpace3D/ancestorSpace) An ancestor coordinate space. ### Instance Methods [`func ancestorFromSpaceTransform() throws -> ProjectiveTransform3D`](/documentation/Spatial/CoordinateSpace3D/ancestorFromSpaceTransform()) This space’s transform relative to its ancestor. [`func convert(value: T, from: Self) throws -> T`](/documentation/Spatial/CoordinateSpace3D/convert(value:from:)-3zi9f) Converts a value from a source coordinate space to this one. [`func convert(value: T, from: Space) throws -> T`](/documentation/Spatial/CoordinateSpace3D/convert(value:from:)-7og5p) Converts a value from a source coordinate space to this one. [`func convert(value: T, to: Space) throws -> T`](/documentation/Spatial/CoordinateSpace3D/convert(value:to:)-2i668) Converts a value from this coordinate space to another. [`func convert(value: T, to: Self) throws -> T`](/documentation/Spatial/CoordinateSpace3D/convert(value:to:)-u2a0) Converts a value from this coordinate space to another. [`func transform(from: Self) throws -> ProjectiveTransform3D`](/documentation/Spatial/CoordinateSpace3D/transform(from:)) Returns a transform of this coordinate space from the target coordinate space. [`func transformSpace((Self) -> ProjectiveTransform3D) -> some CoordinateSpace3D`](/documentation/Spatial/CoordinateSpace3D/transformSpace(_:)) Returns a modified version of the coordinate space. ### Type Properties [`static var worldReference: WorldReferenceCoordinateSpace`](/documentation/Spatial/CoordinateSpace3D/worldReference) A coordinate space that represents the world root for all other coordinate spaces. ## Relationships ### Inherited By [`CoordinateSpace3DFloat`](/documentation/Spatial/CoordinateSpace3DFloat) ### Conforming Types [`WorldReferenceCoordinateSpace`](/documentation/Spatial/WorldReferenceCoordinateSpace) --- 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)