[Radiance-general] aspect ratio problem

[Bleicher, Thomas]

Hi Iebele and others:

> -----Original Message-----
> Subject: Re: [Radiance-general] aspect ratio problem
> 
> Hi Carsten,
> 
> I have a real problem in understanding goniometry :(
> 
> Do you know how to solve your equotation when the horizontal 
> view angle is known?
> In other words, how do I get the value of vv when:
> 
> tan(vv) / tan ( 84 degrees ) = 576/1024
> 
> Thanks a lot!

I'm not repeating the other add ons to this equation
just one thing everyone seems to miss (and which is
a bit of nitpicking):

tan(2*a) != 2*tan(a)

therefore the correct equation is

tan(vv/2) / tan(hv/2) = 576 / 1024


Might make the amazing difference of 2 pixels for
an image of that size!


Thomas


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