cam_pos      = [0.61157, 1.44422, 1.345]';
cam_dir      = [-0.879796, 0.00284471, 0.475343]';
cam_up       = [-0.209843, 0.894947, -0.393746]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.567281, 0.593398, 1.04641]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;