diff --git a/packages/redgeometry/src/primitives/bezier.ts b/packages/redgeometry/src/primitives/bezier.ts
index 778a3aa..5bdda5d 100644
--- a/packages/redgeometry/src/primitives/bezier.ts
+++ b/packages/redgeometry/src/primitives/bezier.ts
@@ -14,40 +14,40 @@ import { Edge2 } from "./edge.js";
 import { Point2, Point3, type Point2Like } from "./point.js";
 import { Vector2, type Vector3 } from "./vector.js";
 
-export enum CurveType {
-    Bezier1,
-    Bezier2,
-    Bezier3,
-    BezierR,
-}
-
 export type Bezier1Curve2Like = {
-    readonly p0: Point2;
-    readonly p1: Point2;
+    readonly p0: Point2Like;
+    readonly p1: Point2Like;
 };
 
 export type Bezier2Curve2Like = {
-    readonly p0: Point2;
-    readonly p1: Point2;
-    readonly p2: Point2;
+    readonly p0: Point2Like;
+    readonly p1: Point2Like;
+    readonly p2: Point2Like;
 };
 
 export type Bezier3Curve2Like = {
-    readonly p0: Point2;
-    readonly p1: Point2;
-    readonly p2: Point2;
-    readonly p3: Point2;
+    readonly p0: Point2Like;
+    readonly p1: Point2Like;
+    readonly p2: Point2Like;
+    readonly p3: Point2Like;
 };
 
 export type BezierRCurve2Like = {
-    readonly p0: Point2;
-    readonly p1: Point2;
-    readonly p2: Point2;
+    readonly p0: Point2Like;
+    readonly p1: Point2Like;
+    readonly p2: Point2Like;
     readonly w: number;
 };
 
 export type BezierCurve2 = Bezier1Curve2 | Bezier2Curve2 | Bezier3Curve2 | BezierRCurve2;
 
+export enum CurveType {
+    Bezier1,
+    Bezier2,
+    Bezier3,
+    BezierR,
+}
+
 export class Bezier1Curve2 {
     public p0: Point2;
     public p1: Point2;
@@ -85,7 +85,7 @@ export class Bezier1Curve2 {
         return new Bezier1Curve2(p0, p1);
     }
 
-    public static toObject(c: Bezier1Curve2): { p0: Point2Like; p1: Point2Like } {
+    public static toObject(c: Bezier1Curve2): Bezier1Curve2Like {
         const p0 = Point2.toObject(c.p0);
         const p1 = Point2.toObject(c.p1);
         return { p0, p1 };
@@ -246,7 +246,7 @@ export class Bezier2Curve2 {
         return new Bezier2Curve2(p0, p1, p2);
     }
 
-    public static toObject(c: Bezier2Curve2): { p0: Point2Like; p1: Point2Like; p2: Point2Like } {
+    public static toObject(c: Bezier2Curve2): Bezier2Curve2Like {
         const p0 = Point2.toObject(c.p0);
         const p1 = Point2.toObject(c.p1);
         const p2 = Point2.toObject(c.p2);
@@ -627,7 +627,7 @@ export class Bezier3Curve2 {
         return new Bezier3Curve2(p0, p1, p2, p3);
     }
 
-    public static toObject(c: Bezier3Curve2): { p0: Point2Like; p1: Point2Like; p2: Point2Like; p3: Point2Like } {
+    public static toObject(c: Bezier3Curve2): Bezier3Curve2Like {
         const p0 = Point2.toObject(c.p0);
         const p1 = Point2.toObject(c.p1);
         const p2 = Point2.toObject(c.p2);
@@ -1031,7 +1031,7 @@ export class BezierRCurve2 {
         return v1.dot(v2) / Math.sqrt(v1.lenSq() * v2.lenSq());
     }
 
-    public static toObject(c: BezierRCurve2): { p0: Point2Like; p1: Point2Like; p2: Point2Like; w: number } {
+    public static toObject(c: BezierRCurve2): BezierRCurve2Like {
         const p0 = Point2.toObject(c.p0);
         const p1 = Point2.toObject(c.p1);
         const p2 = Point2.toObject(c.p2);
diff --git a/packages/redgeometry/src/primitives/box.ts b/packages/redgeometry/src/primitives/box.ts
index c7e61e2..f8ca24b 100644
--- a/packages/redgeometry/src/primitives/box.ts
+++ b/packages/redgeometry/src/primitives/box.ts
@@ -69,7 +69,7 @@ export class Box2 {
         return new Box2(x0, y0, x1, y1);
     }
 
-    public static toObject(box: Box2): { x0: number; y0: number; x1: number; y1: number } {
+    public static toObject(box: Box2): Box2Like {
         return { x0: box.x0, y0: box.y0, x1: box.x1, y1: box.y1 };
     }
 
@@ -276,7 +276,7 @@ export class Box3 {
         return new Box3(x0, y0, z0, x1, y1, z1);
     }
 
-    public static toObject(box: Box3): { x0: number; y0: number; z0: number; x1: number; y1: number; z1: number } {
+    public static toObject(box: Box3): Box3Like {
         return { x0: box.x0, y0: box.y0, z0: box.z0, x1: box.x1, y1: box.y1, z1: box.z1 };
     }
 
diff --git a/packages/redgeometry/src/primitives/color.ts b/packages/redgeometry/src/primitives/color.ts
index 95c2264..d481764 100644
--- a/packages/redgeometry/src/primitives/color.ts
+++ b/packages/redgeometry/src/primitives/color.ts
@@ -62,7 +62,7 @@ export class ColorRgba {
         return new ColorRgba(obj.r, obj.g, obj.b, obj.a);
     }
 
-    public static toObject(c: ColorRgba): { r: number; g: number; b: number; a: number } {
+    public static toObject(c: ColorRgba): ColorRgbaLike {
         return { r: c.r, g: c.g, b: c.b, a: c.a };
     }
 
diff --git a/packages/redgeometry/src/primitives/edge.ts b/packages/redgeometry/src/primitives/edge.ts
index 52a68ce..3a3b101 100644
--- a/packages/redgeometry/src/primitives/edge.ts
+++ b/packages/redgeometry/src/primitives/edge.ts
@@ -7,13 +7,13 @@ import { Ray2, Ray3 } from "./ray.js";
 import type { Vector2, Vector3 } from "./vector.js";
 
 export type Edge2Like = {
-    readonly p0: Point2;
-    readonly p1: Point2;
+    readonly p0: Point2Like;
+    readonly p1: Point2Like;
 };
 
 export type Edge3Like = {
-    readonly p0: Point3;
-    readonly p1: Point3;
+    readonly p0: Point3Like;
+    readonly p1: Point3Like;
 };
 
 export class Edge2 {
@@ -278,7 +278,7 @@ export class Edge2 {
         return e1.p0.eq(e2.p1) && e1.p1.eq(e2.p0);
     }
 
-    public static toObject(e: Edge2): { p0: Point2Like; p1: Point2Like } {
+    public static toObject(e: Edge2): Edge2Like {
         const p0 = Point2.toObject(e.p0);
         const p1 = Point2.toObject(e.p1);
         return { p0, p1 };
@@ -432,7 +432,7 @@ export class Edge3 {
         return e1.p0.eq(e2.p1) && e1.p1.eq(e2.p0);
     }
 
-    public static toObject(e: Edge3): { p0: Point3Like; p1: Point3Like } {
+    public static toObject(e: Edge3): Edge3Like {
         const p0 = Point3.toObject(e.p0);
         const p1 = Point3.toObject(e.p1);
         return { p0, p1 };
diff --git a/packages/redgeometry/src/primitives/matrix.ts b/packages/redgeometry/src/primitives/matrix.ts
index 101e64d..8346a9e 100644
--- a/packages/redgeometry/src/primitives/matrix.ts
+++ b/packages/redgeometry/src/primitives/matrix.ts
@@ -9,6 +9,22 @@ export type MatrixElements3 = FixedSizeArray<number, 9>;
 export type MatrixElements4A = FixedSizeArray<number, 12>;
 export type MatrixElements4 = FixedSizeArray<number, 16>;
 
+export type Matrix3ALike = {
+    readonly elements: MatrixElements3A;
+};
+
+export type Matrix3Like = {
+    readonly elements: MatrixElements3;
+};
+
+export type Matrix4ALike = {
+    readonly elements: MatrixElements4A;
+};
+
+export type Matrix4Like = {
+    readonly elements: MatrixElements4;
+};
+
 export enum MatrixType {
     Affine,
     Projective,
diff --git a/packages/redgeometry/src/primitives/polygon.ts b/packages/redgeometry/src/primitives/polygon.ts
index c7d1622..e066c03 100644
--- a/packages/redgeometry/src/primitives/polygon.ts
+++ b/packages/redgeometry/src/primitives/polygon.ts
@@ -3,7 +3,11 @@ import { Polygon2EdgeIterator } from "../internal/iterator.js";
 import { Box2 } from "./box.js";
 import { Edge2 } from "./edge.js";
 import type { Matrix3, Matrix3A } from "./matrix.js";
-import { Point2 } from "./point.js";
+import { Point2, type Point2Like } from "./point.js";
+
+export type Polygon2Like = {
+    readonly points: Point2Like[];
+};
 
 export class Polygon2 {
     public points: Point2[];
@@ -16,6 +20,11 @@ export class Polygon2 {
         return new Polygon2([]);
     }
 
+    public static fromObject(obj: Polygon2Like): Polygon2 {
+        const points = obj.points.map((p) => Point2.fromObject(p));
+        return new Polygon2(points);
+    }
+
     public static isAreaIntersection(poly1: Polygon2, poly2: Polygon2, isNonZero: boolean): boolean {
         if (Polygon2.isEdgeIntersection(poly1, poly2)) {
             // Polygons intersect
@@ -72,6 +81,11 @@ export class Polygon2 {
         return true;
     }
 
+    public static toObject(path: Polygon2): Polygon2Like {
+        const points = path.points.map((p) => Point2.toObject(p));
+        return { points };
+    }
+
     public addPoint(p: Point2): void {
         this.points.push(p);
     }
diff --git a/packages/redgeometry/src/primitives/quaternion.ts b/packages/redgeometry/src/primitives/quaternion.ts
index eeaaeb1..863d4b9 100644
--- a/packages/redgeometry/src/primitives/quaternion.ts
+++ b/packages/redgeometry/src/primitives/quaternion.ts
@@ -3,6 +3,13 @@ import { eqApproxAbs, eqApproxRel, lerp } from "../utility/scalar.js";
 import { Point3 } from "./point.js";
 import { Vector3 } from "./vector.js";
 
+export type QuaternionLike = {
+    readonly a: number;
+    readonly b: number;
+    readonly c: number;
+    readonly d: number;
+};
+
 export enum RotationOrder {
     XYZ,
     XZY,
@@ -12,13 +19,6 @@ export enum RotationOrder {
     ZYX,
 }
 
-export type QuaternionLike = {
-    readonly a: number;
-    readonly b: number;
-    readonly c: number;
-    readonly d: number;
-};
-
 /**
  * A quaternion to be used for 3D rotations.
  *
diff --git a/packages/redgeometry/src/primitives/ray.ts b/packages/redgeometry/src/primitives/ray.ts
index 2b8c34c..1a880f9 100644
--- a/packages/redgeometry/src/primitives/ray.ts
+++ b/packages/redgeometry/src/primitives/ray.ts
@@ -2,13 +2,13 @@ import { Point2, Point3, type Point2Like, type Point3Like } from "./point.js";
 import { Vector2, Vector3, type Vector2Like, type Vector3Like } from "./vector.js";
 
 export type Ray2Like = {
-    readonly p: Point2;
-    readonly v: Vector2;
+    readonly p: Point2Like;
+    readonly v: Vector2Like;
 };
 
 export type Ray3Like = {
-    readonly p: Point3;
-    readonly v: Vector3;
+    readonly p: Point3Like;
+    readonly v: Vector3Like;
 };
 
 export class Ray2 {
@@ -80,7 +80,7 @@ export class Ray2 {
         return [t, u];
     }
 
-    public static toObject(ray: Ray2): { p: Point2Like; v: Vector2Like } {
+    public static toObject(ray: Ray2): Ray2Like {
         const p = Point2.toObject(ray.p);
         const v = Vector2.toObject(ray.v);
         return { p, v };
@@ -212,7 +212,7 @@ export class Ray3 {
         return [t1, t2];
     }
 
-    public static toObject(ray: Ray3): { p: Point3Like; v: Vector3Like } {
+    public static toObject(ray: Ray3): Ray3Like {
         const p = Point3.toObject(ray.p);
         const v = Vector3.toObject(ray.v);
         return { p, v };