How do you calculate the distance from the camera so that a GameObject fills the screen? I.e. Without reaching out of the view and regardless of screen orientation.
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You can return the difference of transform.position of Main Camera and transform.position of GameObject, if you only want the distance between them.
If you want something else, I think this video might help you
https://www.youtube.com/watch?v=MFQhpwc6cKE
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2\$\begingroup\$ I think OP is asking not for the current distance between the object & camera, but the required distance they'll need to move the camera to in order for the whole object to fit on screen. \$\endgroup\$– DMGregory ♦May 11 '19 at 21:34
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\$\begingroup\$ Sarvagna Shukla, thanks for your contribution. @DMGregory you're right, it's about finding the required distance to make a GameObject fit onto on the screen. I've edited the question to make it more clear. Thanks for your feedback. \$\endgroup\$ May 11 '19 at 22:30