title: How to make object walk up and down stairs/fall if there is no "floor"?
body: <p>I'm totally new to AFRAME and html. I made my <a href="https://ipfs.io/ipfs/QmdyNXfGbMbMV2rpDDAy8mGwBuisqbKWBL1baCZgMtw8U3/" rel="nofollow noreferrer">first virtual experience</a> recently!!</p>
  <p>For the next step, i want to make some stairs that the character/first person camera can walk up and down, and also a hole in the floor so the character/first person camera can &quot;fall&quot; into the hole.</p>
  <p>what is that called/where can i begin looking for how to do that?</p>