cam_pos      = [0.653425, 1.44228, 1.32005]';
cam_dir      = [-0.549998, -0.224281, 0.804488]';
cam_up       = [-0.238202, 0.965382, 0.106287]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.06463, 0.17712, 0.777228]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;