cam_pos      = [-0.209742, 1.51462, 0.680759]';
cam_dir      = [-0.913186, 0.0540145, -0.403948]';
cam_up       = [0.389785, 0.405153, -0.826994]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.158258, 1.21383, 0.520075]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;