Hi~
I want to add a function to switch camera between perspective and orthographic, I need to correctly set orthoLRTB to keep camera looks like in same position and distance. I have tried this pg (https://playground.babylonjs.com/#QN0D08#1), I am not sure if it’s right.
The current switch is instantaneous. Is there a gradual way to transition from perspective to ortho?
Orthographic mode is basically just fov = 0
so what you want is to transition fov from whatever it is right now to 0
but changing fov causes a zooming effect so you also have to move the camera back to keep the frame constant.
But if you actually transition to fov = 0, your camera will need to be at inifinity distance.
so what we actually do is.
- transition fov to near 0 (say 0.001)
- then change to ortho view
I asked chatgpt to implement this and it did a pretty good job, here’s the PG
Press “t” to transition
(you’ll prolly need to save some of your initial camera params to do the reverse transition)
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Thank you! It is pretty good job! 
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