cam_pos      = [-0.120377, 1.0451, 0.530213]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.804701, 0.435051, -0.403964]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.152442, 1.03938, 0.815694]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;