diff --git a/docs/imgs/usage_vis_demo2.jpg b/docs/imgs/usage_vis_demo2.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..9665e9e2f4d90d6db75411d43d0dc5a34d8b28e7
Binary files /dev/null and b/docs/imgs/usage_vis_demo2.jpg differ
diff --git a/docs/imgs/usage_vis_demo3.jpg b/docs/imgs/usage_vis_demo3.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..318c06bcf7debf76b7bff504648df056802130df
Binary files /dev/null and b/docs/imgs/usage_vis_demo3.jpg differ