Add toJSON in base math class

packages/math/src/Color.ts

@@ -303,6 +303,19 @@ export class Color implements IClone<Color>, ICopy<ColorLike, Color> {
 
     return (max + min) / 2;
   }
+
+  /**
+   * Serialize this color to a JSON representation.
+   * @return A JSON representation of this color
+   */
+  toJSON(): ColorLike {
+    return {
+      r: this._r,
+      g: this._g,
+      b: this._b,
+      a: this._a
+    };
+  }
 }
 
 interface ColorLike {

packages/math/src/Quaternion.ts

@@ -757,6 +757,19 @@ export class Quaternion implements IClone<Quaternion>, ICopy<QuaternionLike, Qua
     out[outOffset + 3] = this._w;
   }
 
+  /**
+   * Serialize this quaternion to a JSON representation.
+   * @returns A JSON Object representation of this quaternion
+   */
+  toJSON(): QuaternionLike {
+    return {
+      x: this._x,
+      y: this._y,
+      z: this._z,
+      w: this._w
+    };
+  }
+
   private _toYawPitchRoll(out: Vector3): void {
     // https://en.wikipedia.org/wiki/Conversion_between_quaternions_and_Euler_angles
     const { _x: x, _y: y, _z: z, _w: w } = this;

packages/math/src/Vector2.ts

@@ -374,6 +374,17 @@ export class Vector2 implements IClone<Vector2>, ICopy<Vector2Like, Vector2> {
     out[outOffset] = this._x;
     out[outOffset + 1] = this._y;
   }
+
+  /**
+   * Serialize this vector to a JSON representation.
+   * @returns A JSON representation of this vector
+   */
+  toJSON(): Vector2Like {
+    return {
+      x: this._x,
+      y: this._y
+    };
+  }
 }
 
 interface Vector2Like {

packages/math/src/Vector3.ts

@@ -585,6 +585,18 @@ export class Vector3 implements IClone<Vector3>, ICopy<Vector3Like, Vector3> {
     out[outOffset + 1] = this._y;
     out[outOffset + 2] = this._z;
   }
+
+  /**
+   * Serialize this vector to a JSON representation.
+   * @returns A JSON representation of this vector
+   */
+  toJSON(): Vector3Like {
+    return {
+      x: this._x,
+      y: this._y,
+      z: this._z
+    };
+  }
 }
 
 interface Vector3Like {

packages/math/src/Vector4.ts

@@ -503,6 +503,19 @@ export class Vector4 implements IClone<Vector4>, ICopy<Vector4Like, Vector4> {
     out[outOffset + 2] = this._z;
     out[outOffset + 3] = this._w;
   }
+
+  /**
+   * Serialize this vector to a JSON representation.
+   * @returns A JSON representation of this vector
+   */
+  toJSON(): Vector4Like {
+    return {
+      x: this._x,
+      y: this._y,
+      z: this._z,
+      w: this._w
+    };
+  }
 }
 
 interface Vector4Like {

tests/src/math/Color.test.ts

@@ -84,4 +84,10 @@ describe("Color test", () => {
       expect(Color.equals(colorLinear, colorNewLinear)).to.eq(true);
     }
   });
+
+  it('toJSON', ()=>{
+    const color = new Color(1, 0.5, 0.5, 1);
+    const json = color.toJSON();
+    expect(json).to.deep.eq({r: 1, g: 0.5, b: 0.5, a: 1});
+  })
 });

tests/src/math/Vector2.test.ts

@@ -203,4 +203,9 @@ describe("Vector2 test", () => {
     expect(toString(a.scale(2))).to.eq(toString(a));
     expect(toString(a)).to.eq("vec2(6, 8)");
   });
+
+  it("toJSON", () => {
+    const a = new Vector2(3, 4);
+    expect(a.toJSON()).to.deep.eq({ x: 3, y: 4 });
+  });
 });

tests/src/math/Vector3.test.ts

@@ -257,4 +257,9 @@ describe("Vector3 test", () => {
     a.transformByQuat(new Quaternion(2, 3, 4, 5));
     expect(toString(a)).to.eq("vec3(108, 162, 216)");
   });
+
+  it("toJSON", () => {
+    const a = new Vector3(2, 3, 4);
+    expect(JSON.stringify(a)).to.eq('{"x":2,"y":3,"z":4}');
+  });
 });

tests/src/math/Vector4.test.ts

@@ -209,4 +209,9 @@ describe("Vector4 test", () => {
     expect(toString(a.scale(2))).to.eq(toString(a));
     expect(toString(a)).to.eq("vec4(6, 8, 0, 0)");
   });
+
+  it("toJSON", () => {
+    const a = new Vector4(3, 4, 5, 0);
+    expect(JSON.stringify(a)).to.eq('{"x":3,"y":4,"z":5,"w":0}');
+  });
 });