cam_pos      = [-0.117296, 1.58021, 0.85057]';
cam_dir      = [-0.734299, 0.220925, 0.64187]';
cam_up       = [-0.315926, 0.725694, -0.611195]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.799104, 0.866605, 0.615896]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;