cam_pos      = [0.441512, 1.47076, 1.45888]';
cam_dir      = [-0.96778, -0.0601812, 0.244501]';
cam_up       = [-0.186329, 0.824284, -0.534637]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.225253, 0.748749, 1.07589]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;