Method multiplyVec4

src/math/Matrices/Matrix.js:1383–1393

* Applies a matrix to a vector with x, y, z, w components and returns the result as an array. * * This method multiplies the current matrix by a 4D vector (x, y, z, w) and computes the resulting vector. * It is commonly used in 3D graphics for transformations such as translation, rotation,

(x, y, z, w)

   * }
   */
  multiplyVec4(x, y, z, w) {
    const result = new Array(4);
    const m = this.matrix;

    result[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
    result[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
    result[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
    result[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;

    return result;
  }

  /**
   * Applies a matrix to a vector. The fourth component is set to 1.