cam_pos      = [0.68147, 1.68147, 1.17307]';
cam_dir      = [-0.350822, 0.0239126, -0.936137]';
cam_up       = [-0.435276, 0.880953, 0.185625]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.10274, -0.628557, 0.397203]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;