different zoom levels on perspective and orthographic cameras?

[tilnea]

Hi,

I want to switch between the two default cameras, but I feel like the orthographic camera is zoomed in out around 120 times more than the default perspective one?

Why is that?
And exactly how much zoomed is it compared to the perspective one?

Thanks!

[drcmda]

it has a zoom property. i dont know the specifics of the threejs controls so much, you can ask them, but i tend to just set the zoom prop until its close to the perspective cam.

[tilnea]

Ok, thanks 👍

[dangrabcad]

R3F adjusts the cameras when the canvas pixel size changes, to maintain the aspect. With the orthographic camera, it does this by setting the left/right/top/bottom so that one world space unit projects to one pixel. That's usually more zoomed-out than you want it to be. You can set the zoom property accordingly - it's just a multiplier, so if your whole scene is one world space unit wide and you want it to fit into a 100 px wide viewport, set it to 0.01. With the perspective camera, you instead set the fov, and some simple trigonometry will tell you what to set it to: to get the same stuff visible at the target, keep (right - left) / zoom = tan(fov/2) * distance * 2, where distance is the world-space distance from the camera to the target.