cam_pos      = [1.01856, 1.77862, 1.3699]';
cam_dir      = [-0.176051, 0.0690536, -0.981956]';
cam_up       = [-0.351788, 0.927249, 0.128277]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.22277, -0.489471, 0.184805]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;