Method copy

packages/melonjs/src/math/observableVector3d.ts:338–340

* Copy the components of the given vector into this one * @param v other vector * @returns Reference to this object for method chaining

(v: Vector2d | Vector3d | ObservableVector3d)

	 * @returns Reference to this object for method chaining
	 */
	copy(v: Vector2d | Vector3d | ObservableVector3d) {
		return this.set(v.x, v.y, "z" in v ? v.z : 0);
	}

	/**
	 * return true if this vector is equal to the given values or vector