

"clipka" <ano### [at] anonymousorg> wrote in message
news:4a80d86e$1@news.povray.org...
> 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).
isn't that exactly why screen.inc was made?
cu!

#macro G(b,e)b+(eb)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(yx,y,x,x+y)_(y,xy,x+y,y)_(xy,y,y,y+z)_(y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0xy.5+y/2x) // ZK http://www.povplace.com
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