Support for partial lathes (and by extension partial cylinders)

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Change Log
 
+## [0.7.5](https://github.com/nicklockwood/Euclid/releases/tag/0.7.5) (2024-01-29)
+
+- Added I/O functions
+- Fixed transform not being applied to meshes created from a RealityKit `ModelEntity`
+- Materials are now preserved for meshes created from RealityKit models
+- Deprecated the `Quaternion` type in favor of `Rotation`
+
 ## [0.7.4](https://github.com/nicklockwood/Euclid/releases/tag/0.7.4) (2024-01-19)
 
 - Removed stray `print()` statement from RealityKit exporter

Euclid.docc/Extensions/Color.md

@@ -4,11 +4,11 @@
 
 ### Creating a Color
 
+- ``Color/init(r:g:b:a:)``
 - ``Color/init(_:_:_:_:)``
 - ``Color/init(_:_:)``
-- ``Color/init(_:)-25eby``
 - ``Color/init(_:)-53lhy``
-- ``Color/init(_:)-7d8un``
+- ``Color/init(_:)-9bvpm``
 
 ### Default Colors
 

Euclid.docc/Extensions/Vector.md

@@ -4,14 +4,12 @@
 
 ### Creating Vectors
 
-- ``Vector/init(_:)-228p6``
-- ``Vector/init(_:)-4eop9``
-- ``Vector/init(_:)-5n3j``
-- ``Vector/init(_:)-63ct7``
-- ``Vector/init(_:)-6nlm``
+- ``Vector/init(x:y:z:)``
 - ``Vector/init(_:_:_:)``
 - ``Vector/init(size:)-8b34m``
 - ``Vector/init(size:)-nkyk``
+- ``Vector/init(_:)-63ct7``
+- ``Vector/init(_:)-602vn``
 
 ### Default Vectors
 

Euclid.podspec.json

@@ -1,6 +1,6 @@
 {
   "name": "Euclid",
-  "version": "0.7.4",
+  "version": "0.7.5",
   "license": {
     "type": "MIT",
     "file": "LICENSE.md"
@@ -10,7 +10,7 @@
   "authors": "Nick Lockwood",
   "source": {
     "git": "https://github.com/nicklockwood/Euclid.git",
-    "tag": "0.7.4"
+    "tag": "0.7.5"
   },
   "source_files": "Sources",
   "requires_arc": true,

Euclid.xcodeproj/project.pbxproj

@@ -13,6 +13,8 @@
 		0112D5C928EE29BB00A1C085 /* Euclid+RealityKit.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0112D5C828EE29BB00A1C085 /* Euclid+RealityKit.swift */; };
 		0125478027AFD53900C442C3 /* MeshShapeTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0125477F27AFD53900C442C3 /* MeshShapeTests.swift */; };
 		0128EEBB2ABA607A00E60976 /* EuclidMesh.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0128EEBA2ABA607A00E60976 /* EuclidMesh.swift */; };
+		0131216A2A9E61B500BC8683 /* Path+CSG.swift in Sources */ = {isa = PBXBuildFile; fileRef = 013121692A9E61B500BC8683 /* Path+CSG.swift */; };
+		0131216D2AA2987500BC8683 /* PolygonCSGTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0131216B2AA2979900BC8683 /* PolygonCSGTests.swift */; };
 		013312DD21CA532A00626F1B /* PlaneTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 013312DC21CA532A00626F1B /* PlaneTests.swift */; };
 		013499932902FB5900CED6BE /* Euclid+SIMD.swift in Sources */ = {isa = PBXBuildFile; fileRef = 013499922902FB5900CED6BE /* Euclid+SIMD.swift */; };
 		0134999729043ACC00CED6BE /* RealityKitViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0134999629043ACC00CED6BE /* RealityKitViewController.swift */; };
@@ -23,6 +25,8 @@
 		014AC60E2505963800F54349 /* SceneKitTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 014AC60D2505963800F54349 /* SceneKitTests.swift */; };
 		0157FEC42B63B1BE009033D1 /* Mesh+IO.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0157FEC32B63B1BE009033D1 /* Mesh+IO.swift */; };
 		0162A09623795E260078AE84 /* Euclid.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 016FAB2921BFE78100AF60DC /* Euclid.framework */; platformFilters = (ios, maccatalyst, ); };
+		01593CCB297C39180058A35C /* Direction.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01593CCA297C39180058A35C /* Direction.swift */; };
+		01593CCD297CB5AF0058A35C /* Position.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01593CCC297CB5AF0058A35C /* Position.swift */; };
 		0162A09923795EB30078AE84 /* Euclid.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 016FAB2921BFE78100AF60DC /* Euclid.framework */; };
 		016A77F82B2F7C7800B7AB73 /* MeshImportTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 016A77F72B2F7C7800B7AB73 /* MeshImportTests.swift */; };
 		016A77FA2B32184A00B7AB73 /* RealityKitTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 016A77F92B32184A00B7AB73 /* RealityKitTests.swift */; };
@@ -70,12 +74,13 @@
 		01E5F54923D59BF100717D58 /* BSP.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01E5F54823D59BF100717D58 /* BSP.swift */; };
 		01F2382023BF4160005EC9DB /* LineSegment.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01F2381F23BF4160005EC9DB /* LineSegment.swift */; };
 		01F2465428FD4A020071AE64 /* QuaternionTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01F2465228FD499F0071AE64 /* QuaternionTests.swift */; };
-		01FAE7BD29744E08008DB288 /* PolygonCSGTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01FAE7BB29744C22008DB288 /* PolygonCSGTests.swift */; };
+		01FAE7BD29744E08008DB288 /* PathCSGTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01FAE7BB29744C22008DB288 /* PathCSGTests.swift */; };
 		0A240137256A64FB00C1535C /* AngleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A240136256A64FB00C1535C /* AngleTests.swift */; };
 		0A24013F256A671600C1535C /* Angle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A24013E256A671600C1535C /* Angle.swift */; };
 		52A3852E238D6E5700BE8407 /* LineTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 52A3852D238D6E5700BE8407 /* LineTests.swift */; };
 		52A663A123857D5300FACF9D /* Line.swift in Sources */ = {isa = PBXBuildFile; fileRef = 52A663A023857D5300FACF9D /* Line.swift */; };
 		52C844E223854CDF009C0A73 /* VectorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 52C844E023854C87009C0A73 /* VectorTests.swift */; };
+		EA3A382D29700A4400A6185A /* Edge.swift in Sources */ = {isa = PBXBuildFile; fileRef = EA3A382C29700A4400A6185A /* Edge.swift */; };
 		EA6F2219296C5A9000B530BE /* Polygon+CSG.swift in Sources */ = {isa = PBXBuildFile; fileRef = EA6F2218296C5A9000B530BE /* Polygon+CSG.swift */; };
 /* End PBXBuildFile section */
 
@@ -117,6 +122,8 @@
 		0112D5C828EE29BB00A1C085 /* Euclid+RealityKit.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Euclid+RealityKit.swift"; sourceTree = "<group>"; };
 		0125477F27AFD53900C442C3 /* MeshShapeTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MeshShapeTests.swift; sourceTree = "<group>"; };
 		0128EEBA2ABA607A00E60976 /* EuclidMesh.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EuclidMesh.swift; sourceTree = "<group>"; };
+		013121692A9E61B500BC8683 /* Path+CSG.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Path+CSG.swift"; sourceTree = "<group>"; };
+		0131216B2AA2979900BC8683 /* PolygonCSGTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PolygonCSGTests.swift; sourceTree = "<group>"; };
 		013312DC21CA532A00626F1B /* PlaneTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PlaneTests.swift; sourceTree = "<group>"; };
 		013499922902FB5900CED6BE /* Euclid+SIMD.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Euclid+SIMD.swift"; sourceTree = "<group>"; };
 		0134999629043ACC00CED6BE /* RealityKitViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RealityKitViewController.swift; sourceTree = "<group>"; };
@@ -129,6 +136,8 @@
 		0157FEC32B63B1BE009033D1 /* Mesh+IO.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Mesh+IO.swift"; sourceTree = "<group>"; };
 		016A77F72B2F7C7800B7AB73 /* MeshImportTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MeshImportTests.swift; sourceTree = "<group>"; };
 		016A77F92B32184A00B7AB73 /* RealityKitTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RealityKitTests.swift; sourceTree = "<group>"; };
+		01593CCA297C39180058A35C /* Direction.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Direction.swift; sourceTree = "<group>"; };
+		01593CCC297CB5AF0058A35C /* Position.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Position.swift; sourceTree = "<group>"; };
 		016FAB2921BFE78100AF60DC /* Euclid.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Euclid.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		016FAB2C21BFE78100AF60DC /* Euclid.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Euclid.h; sourceTree = "<group>"; };
 		016FAB2D21BFE78100AF60DC /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -177,12 +186,13 @@
 		01E5F54823D59BF100717D58 /* BSP.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BSP.swift; sourceTree = "<group>"; };
 		01F2381F23BF4160005EC9DB /* LineSegment.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LineSegment.swift; sourceTree = "<group>"; };
 		01F2465228FD499F0071AE64 /* QuaternionTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = QuaternionTests.swift; sourceTree = "<group>"; };
-		01FAE7BB29744C22008DB288 /* PolygonCSGTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PolygonCSGTests.swift; sourceTree = "<group>"; };
+		01FAE7BB29744C22008DB288 /* PathCSGTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PathCSGTests.swift; sourceTree = "<group>"; };
 		0A240136256A64FB00C1535C /* AngleTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AngleTests.swift; sourceTree = "<group>"; };
 		0A24013E256A671600C1535C /* Angle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Angle.swift; sourceTree = "<group>"; };
 		52A3852D238D6E5700BE8407 /* LineTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LineTests.swift; sourceTree = "<group>"; };
 		52A663A023857D5300FACF9D /* Line.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Line.swift; sourceTree = "<group>"; };
 		52C844E023854C87009C0A73 /* VectorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VectorTests.swift; sourceTree = "<group>"; };
+		EA3A382C29700A4400A6185A /* Edge.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Edge.swift; sourceTree = "<group>"; };
 		EA6F2218296C5A9000B530BE /* Polygon+CSG.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Polygon+CSG.swift"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -251,11 +261,13 @@
 				0188525726D951490079C602 /* Color.swift */,
 				016FAB4521BFE7C100AF60DC /* Utilities.swift */,
 				016FAB4321BFE7C100AF60DC /* Vector.swift */,
+				01593CCC297CB5AF0058A35C /* Position.swift */,
+				01593CCA297C39180058A35C /* Direction.swift */,
 				016FAB4621BFE7C100AF60DC /* Vertex.swift */,
+				EA3A382C29700A4400A6185A /* Edge.swift */,
 				016FAB4C21BFE7C200AF60DC /* Polygon.swift */,
 				EA6F2218296C5A9000B530BE /* Polygon+CSG.swift */,
 				01E5F54823D59BF100717D58 /* BSP.swift */,
-				016FAB4921BFE7C200AF60DC /* Path.swift */,
 				016FAB4821BFE7C200AF60DC /* Mesh.swift */,
 				016FAB4421BFE7C100AF60DC /* Mesh+CSG.swift */,
 				016FAB4E21BFE7C200AF60DC /* Mesh+Shapes.swift */,
@@ -264,7 +276,9 @@
 				010A63382A951165000E3306 /* Mesh+OBJ.swift */,
 				0157FEC32B63B1BE009033D1 /* Mesh+IO.swift */,
 				016FAB4D21BFE7C200AF60DC /* Plane.swift */,
+				016FAB4921BFE7C200AF60DC /* Path.swift */,
 				0148ECA52783796A00B3F836 /* PathPoint.swift */,
+				013121692A9E61B500BC8683 /* Path+CSG.swift */,
 				0148ECA3278378D100B3F836 /* Path+Shapes.swift */,
 				52A663A023857D5300FACF9D /* Line.swift */,
 				01F2381F23BF4160005EC9DB /* LineSegment.swift */,
@@ -291,9 +305,9 @@
 				0A240136256A64FB00C1535C /* AngleTests.swift */,
 				01D96AB423D8E36A00D0D267 /* BoundsTests.swift */,
 				01BA29792235E34C0088D36B /* CGPathTests.swift */,
-				0101BAF425687A450096B1E7 /* CodingTests.swift */,
 				0188E98226ACA0040029C253 /* LineSegmentTests.swift */,
 				52A3852D238D6E5700BE8407 /* LineTests.swift */,
+				0101BAF425687A450096B1E7 /* CodingTests.swift */,
 				01CBE2672775E3EE00B7ED45 /* MeshTests.swift */,
 				016FAB5F21BFE7CE00AF60DC /* MeshCSGTests.swift */,
 				010A633A2A955BE9000E3306 /* MeshExportTests.swift */,
@@ -302,8 +316,9 @@
 				013B5BE426923087000860DC /* MetadataTests.swift */,
 				016FAB5C21BFE7CD00AF60DC /* PathTests.swift */,
 				016FAB6021BFE7CE00AF60DC /* PathShapeTests.swift */,
+				01FAE7BB29744C22008DB288 /* PathCSGTests.swift */,
 				016FAB5E21BFE7CE00AF60DC /* PolygonTests.swift */,
-				01FAE7BB29744C22008DB288 /* PolygonCSGTests.swift */,
+				0131216B2AA2979900BC8683 /* PolygonCSGTests.swift */,
 				013312DC21CA532A00626F1B /* PlaneTests.swift */,
 				014AC60D2505963800F54349 /* SceneKitTests.swift */,
 				016A77F92B32184A00B7AB73 /* RealityKitTests.swift */,
@@ -530,13 +545,15 @@
 				016FAB5421BFE7C200AF60DC /* Mesh.swift in Sources */,
 				01CF789326EBE0C70097907A /* Quaternion.swift in Sources */,
 				0112D5C928EE29BB00A1C085 /* Euclid+RealityKit.swift in Sources */,
+				01593CCD297CB5AF0058A35C /* Position.swift in Sources */,
 				EA6F2219296C5A9000B530BE /* Polygon+CSG.swift in Sources */,
 				016FAB5721BFE7C200AF60DC /* Transforms.swift in Sources */,
 				016FAB5121BFE7C200AF60DC /* Utilities.swift in Sources */,
 				016FAB5321BFE7C200AF60DC /* Bounds.swift in Sources */,
 				01BA297C2235E3590088D36B /* Euclid+CoreGraphics.swift in Sources */,
 				0148ECA62783796A00B3F836 /* PathPoint.swift in Sources */,
 				013499932902FB5900CED6BE /* Euclid+SIMD.swift in Sources */,
+				EA3A382D29700A4400A6185A /* Edge.swift in Sources */,
 				0188525A26D952890079C602 /* Euclid+AppKit.swift in Sources */,
 				01A3D52129F32D360085D6BE /* Mesh+STL.swift in Sources */,
 				01B9F60E292BCE57002CC3EB /* Stretchable.swift in Sources */,
@@ -550,11 +567,13 @@
 				0148ECA4278378D100B3F836 /* Path+Shapes.swift in Sources */,
 				52A663A123857D5300FACF9D /* Line.swift in Sources */,
 				01D2F9F82AADBB1400C201D9 /* Mesh+Texcoords.swift in Sources */,
+				01593CCB297C39180058A35C /* Direction.swift in Sources */,
 				016FAB4F21BFE7C200AF60DC /* Vector.swift in Sources */,
 				016FAB5021BFE7C200AF60DC /* Mesh+CSG.swift in Sources */,
 				016FAB5621BFE7C200AF60DC /* Euclid+SceneKit.swift in Sources */,
 				0A24013F256A671600C1535C /* Angle.swift in Sources */,
 				016FAB5921BFE7C200AF60DC /* Plane.swift in Sources */,
+				0131216A2A9E61B500BC8683 /* Path+CSG.swift in Sources */,
 				016FAB5A21BFE7C200AF60DC /* Mesh+Shapes.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -563,12 +582,13 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				01FAE7BD29744E08008DB288 /* PolygonCSGTests.swift in Sources */,
+				01FAE7BD29744E08008DB288 /* PathCSGTests.swift in Sources */,
 				01F2465428FD4A020071AE64 /* QuaternionTests.swift in Sources */,
 				01A429FA2237A85C00C251A6 /* TextTests.swift in Sources */,
 				0188E98326ACA0040029C253 /* LineSegmentTests.swift in Sources */,
 				0A240137256A64FB00C1535C /* AngleTests.swift in Sources */,
 				016A77F82B2F7C7800B7AB73 /* MeshImportTests.swift in Sources */,
+				0131216D2AA2987500BC8683 /* PolygonCSGTests.swift in Sources */,
 				52A3852E238D6E5700BE8407 /* LineTests.swift in Sources */,
 				016FAB6621BFE7CE00AF60DC /* PathShapeTests.swift in Sources */,
 				016FAB6321BFE7CE00AF60DC /* UtilityTests.swift in Sources */,
@@ -796,7 +816,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 0.7.4;
+				MARKETING_VERSION = 0.7.5;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGES = "objective-c objective-c++";
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++14";
 				OTHER_SWIFT_FLAGS = "-Xfrontend -warn-long-expression-type-checking=75";
@@ -835,7 +855,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 0.7.4;
+				MARKETING_VERSION = 0.7.5;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGES = "objective-c objective-c++";
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++14";
 				OTHER_SWIFT_FLAGS = "-Xfrontend -warn-long-expression-type-checking=75";

Euclid.xcodeproj/xcshareddata/xcschemes/Euclid.xcscheme

@@ -53,7 +53,7 @@
       </Testables>
    </TestAction>
    <LaunchAction
-      buildConfiguration = "Release"
+      buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       launchStyle = "0"

Example/SceneKitViewController.swift

@@ -25,15 +25,36 @@ class SceneKitViewController: UIViewController {
         // place the camera
         cameraNode.position = SCNVector3(x: 0, y: 0, z: 2)
 
+        // create some geometry using Euclid
+        let start = CFAbsoluteTimeGetCurrent()
+//        let cube = Mesh.cube(size: 0.8, material: UIColor.red)
+//        let sphere = Mesh.sphere(slices: 120, material: UIColor.blue)
+//        let mesh = cube.subtracting(sphere).makeWatertight()
+
+//        let cube = Mesh.cube().inverted()
+//        let cube2 = Mesh.cube().inverted().translated(by: Vector(0.5, 0.5, 0.5))
+//        let mesh = cube.union(cube2).inverted()
+
+//        print("Time:", CFAbsoluteTimeGetCurrent() - start)
+//        print("Polygons:", mesh.polygons.count)
+//        print("Triangles:", mesh.triangulate().polygons.count)
+//        print("Watertight:", mesh.isWatertight)
+
+        let polygon1 = Path.square(color: .red)
+        let polygon2 = Path.square(color: .green).translated(by: Vector(0.5, 0.5, 0)) // .rotated(by: .yaw(.pi / 5))
+        let polygon3 = Path.square(color: .blue).translated(by: Vector(0.25, -0.25, 0)) // .rotated(by: .yaw(.pi / 5))
+        let result = Path.difference([polygon1, polygon2, polygon3])
+        let mesh = Mesh.fill(result)
+
         // create SCNNode
-        let geometry = SCNGeometry(euclidMesh)
+        let geometry = SCNGeometry(mesh)
         let node = SCNNode(geometry: geometry)
         scene.rootNode.addChildNode(node)
 
         // configure the SCNView
         let scnView = view as! SCNView
         scnView.scene = scene
-        scnView.autoenablesDefaultLighting = true
+//        scnView.autoenablesDefaultLighting = true
         scnView.allowsCameraControl = true
         scnView.backgroundColor = .white
     }

Sources/Angle.swift

@@ -97,13 +97,13 @@ public func tan(_ angle: Angle) -> Double {
 
 public extension Angle {
     /// Angle representing a zero (identity) rotation.
-    static let zero = Angle.radians(0)
+    static let zero: Angle = .radians(0)
     /// Angle representing a quarter rotation.
-    static let halfPi = Angle.radians(.pi / 2)
+    static let halfPi: Angle = .radians(.pi / 2)
     /// Angle representing a half-rotation.
-    static let pi = Angle.radians(.pi)
+    static let pi: Angle = .radians(.pi)
     /// Angle representing a full rotation.
-    static let twoPi = Angle.radians(.pi * 2)
+    static let twoPi: Angle = .radians(.pi * 2)
 
     /// The angle in degrees.
     var degrees: Double {
@@ -206,6 +206,12 @@ public extension Angle {
     }
 }
 
+public extension Angle {
+    func lerp(_ other: Angle, _ t: Double) -> Angle {
+        return self + (other - self) * t
+    }
+}
+
 extension Angle {
     /// Approximate equality
     func isEqual(to other: Angle, withPrecision p: Double = epsilon) -> Bool {