cam_pos      = [-1.14607, 1.48295, 0.156774]';
cam_dir      = [0.142309, -0.360784, 0.921728]';
cam_up       = [0.173105, 0.925926, 0.335701]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.29618, -0.14867, -0.258314]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;