SharkD schrieb:
> gregjohn wrote:
>> It took me 13 years of povving to understand the camera. That is, to 
>> come up
>> with the code for a box which exactly fills the screen, regardless of 
>> camera
>> angle/ distance and image aspect ratio.
> 
> I don't see what the difficulty is. It's as simple as this:
> 
> ...
> 
> The trick here is to not use the angle and look_at keywords. In this 
> case, they're more trouble than they're worth. Also, if you omit the 
> image_width/image_height stuff, then it fills the viewport *exactly*, 
> regardless of the aspect ratio.

What you're doing is designing camera parameters so that a certain 
"friendly" box fills the entire screen.

The OP's challenge, however, was quite different: From a given arbitrary 
(potentially "unfriendly") camera perspective, compute parameters for a 
box to fill the screen (possibly to overlay a border, signature or 
whatever onto the image).

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