A Portal to Nature

First, make the portal door.

Modify objects' shaders to make them only seen inside of the portal door.

Allow users to go inside.

Place the portal 0.5 meters above ground facing camera at where the user ‘s pose is.

I had a hard time with the skybox. It wasn’t rendered in AR Camera. So I tried several different methods, but none of them worked. Finally, I found Pirates Just AR’s tutorial and solved the problem.

(To solve this, I applied a render texture targeted by a second camera that renders the skybox to a Quad that is placed under AR Camera)