cam_pos      = [0.280349, 1.08311, 0.37239]';
cam_dir      = [0.424819, 0.587271, -0.688943]';
cam_up       = [-0.612404, 0.746897, 0.259049]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.886712, -0.414778, -0.900334]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;