cam_pos      = [-0.0518537, 2.01266, -0.0654835]';
cam_dir      = [0.685308, -0.218105, 0.694826]';
cam_up       = [-0.127613, 0.903372, 0.409432]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.95359, 0.49111, -0.786369]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;