cam_pos      = [0.340703, 1.11002, 0.389353]';
cam_dir      = [0.684097, 0.148663, -0.71408]';
cam_up       = [-0.111009, 0.988825, 0.0995143]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.958789, -0.014885, -0.92163]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;