code: public Vector3d mul(Matrix3x2fc mat, Vector3d dest) {
          double rx = mat.m00() * x + mat.m10() * y + mat.m20() * z;
          double ry = mat.m01() * x + mat.m11() * y + mat.m21() * z;
          dest.x = rx;
          dest.y = ry;
          dest.z = z;
          return dest;
      }
docs: /* (non-Javadoc)
  @see org.joml.Vector3dc#mul(org.joml.Matrix3x2fc, org.joml.Vector3d)