cam_pos      = [0.286575, 2.02404, 0.0711404]';
cam_dir      = [0.321591, -0.408546, 0.854207]';
cam_up       = [-0.287186, 0.817551, 0.499134]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.20003, 0.539758, -0.193632]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;