cam_pos      = [0.573023, 1.44977, 1.37499]';
cam_dir      = [-0.910324, 0.0084881, 0.41381]';
cam_up       = [-0.19332, 0.875313, -0.443231]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.486748, 0.64303, 1.05759]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;