Method apply

packages/melonjs/src/math/matrix3d.ts:502–518

* apply the current transform to the given 2d or 3d vector or point * @param v - the vector object to be transformed * @returns result vector object.

(v: Vector3d | Vector2d | Point)

	 * @returns result vector object.
	 */
	apply(v: Vector3d | Vector2d | Point) {
		const a = this.val;
		const x = v.x;
		const y = v.y;
		const z = "z" in v ? v.z : 1;

		const w = a[3] * x + a[7] * y + a[11] * z + a[15] || 1.0;

		v.x = (a[0] * x + a[4] * y + a[8] * z + a[12]) / w;
		v.y = (a[1] * x + a[5] * y + a[9] * z + a[13]) / w;

		if ("z" in v) {
			v.z = (a[2] * x + a[6] * y + a[10] * z + a[14]) / w;
		}

		return v;
	}

	/**
	 * apply the inverted current transform to the given 2d or 3d vector