cam_pos      = [0.326455, 1.10926, 0.37602]';
cam_dir      = [0.615311, 0.34033, -0.711033]';
cam_up       = [-0.280536, 0.937488, 0.205952]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.97978, -0.0967516, -0.894187]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;