cam_pos      = [-0.0664504, 1.45954, 0.771087]';
cam_dir      = [0.557776, 0.0186276, 0.829782]';
cam_up       = [-0.0406376, 0.999162, 0.00488643]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.10256, 0.048473, -0.742228]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;