Method multiplyDirection

src/math/Matrices/Matrix.js:1548–1551

* Applies a matrix to a vector. * The fourth component is set to 0. * Returns a vector consisting of the first * through third components of the result. * * This method multiplies the current matrix by a 4D vector (x, y, z, 0), * effectively transforming the direction vector using

({ x, y, z })

   * }
   */
  multiplyDirection({ x, y, z }) {
    const array = this.multiplyVec4(x, y, z, 0);
    return new Vector(array[0], array[1], array[2]);
  }

  /**
   * Takes a vector and returns the vector resulting from multiplying. This function is only for 3x3 matrices.