cam_pos      = [-0.287437, 0.525548, 1.38517]';
cam_dir      = [0.884767, 0.457294, -0.0898352]';
cam_up       = [-0.375194, 0.81329, 0.444735]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.367661, 0.478509, -1.18522]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;