Camera FOV modification with ZOOM fixe on object scene

Questions
1

Hello,
I’m working on project about 3d object integration inside a picture.

I use the FOV to adapt the perspective of the picture, but on each modification I need to adjust the ZOOM on my object, and it’s complicate because it’s not UX.

To resume my question, we can use the example of (https://threejsfundamentals.org)
https://threejsfundamentals.org/threejs/threejs-cameras-perspective-2-scenes.html
On it, I want change the FOV but i want blocked automatically the ZOOM on the cube.

Do you know a solution for that ?

Thanks all.

2

The link of scene was wrong. I changed it.

3

Hello,
I’m finding a solution here :
http://www.realtimerendering.com/udacity/?load=demo/unit7-dolly-and-zoom.js

What do you think ?