when I click each button then hole page will refresh and appear a question mark on browser URL

I’m guessing this is more of an HTML problem than a Cesium problem, but I can’t recreate this. Which buttons are you talking about? When I click on “Add Obstacle” or “Routing” it doesn’t refresh the page. What browser are you using?

Also, this looks pretty cool! Is this for a competition?

Yes, the problem is on the HTML.
I have already solved it.

Thank you very much.

Yes, it is for a competition.

Omar Shehata於 2018年8月7日星期二 UTC+8下午8時57分42秒寫道: