Calculate the camera radius so that a plane fills the viewport

Questions
1

Hi, I have added a transparent plane, but now I’m stuck with the math. The plane has the same proportion as the canvas. I want the plane to fill the viewport.

I think I need to calculate an appropriate radius for the camera.

2

Did you have a look to the framing behavior: Camera Behaviors | Babylon.js Documentation

3

I finally made it after looking at the BabylonJS code for a long time:

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