cam_pos      = [-1.16875, 1.50695, 0.108736]';
cam_dir      = [0.11718, -0.432091, 0.894185]';
cam_up       = [0.165817, 0.896261, 0.411365]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.3023, -0.133089, -0.234974]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;