cam_pos      = [-0.88158, 1.52277, -1.17227]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [-0.0836916, 0.954023, -0.287812]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.22589, 0.244563, 0.454194]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;