cam_pos      = [-0.587001, 1.42234, 0.376353]';
cam_dir      = [0.710854, 0.0274931, 0.702802]';
cam_up       = [0.528616, 0.638255, -0.55964]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.617057, -1.02321, -0.5841]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;