TinCanMan wrote:
>> In my model I was also concerned about the significance of values in the
>> diagonal of the image from a  4/3 ratio perspective camera with an angle
>of
>> 178deg.
>
>I don't understand what you mean here.
>
>> (I've only just discovered the use of these newsgroups and had been
>> e-mailing your colleague Chris Huff concerning my simulation of
>diffraction
>> gratings in scattering 'media'  and the built-in models for coloured light
>> and chromatic variation of refractive index... do you have those
>'formulae'
>> ?)
>
>Again, I'm not sure what you are looking for here.  You would be better to
>post your questions in a different group as this one isn't really
>appropriate for these types of questions, it is for posting of text
>scene-files as the name implies.  I'm not sure what kind of traffic it gets
>from the community.  Better to try povray.advanced-users or povray.general.
>
>> I would like to  simulate distortion in real camera lenses such as zooming
>> lenses with multiple elements.   I've developed a fairly convenient method
>> of taking the lens prescription from my preferred lens design program (
>> OSLO Pro) and placing it in front of the POV camera to model stray-light
>> etc but it's very time-consuming.  Not a lot I can do about that... but
>> it's quite straightforward to derive polynomials to define the lens
>> distortion ( ratio of the tangents of the true/apparent angles)  as a
>> function of zoom setting and field angle.   I imagined putting a
>> rotationally symmetric aspherical plate in front of the POV camera which
>> would deviate the sightline ray direction to simulate the distortion. Or
>is
>> it possible to do this with the texture in the camera statement?
>>
>> Yours,
>>
>> Don Barron
>>
>>
>
>You're getting a bit beyond me here.
>I can tell you that you can use a 'normal' pattern in the camera statement
>to cause distortions, but I have never really tried it myself so I don't
>know how to work it.
>
>For inromation about lens simulations, have a look at this link:
>http://citeseer.nj.nec.com/127209.html
>
>-tgq
> Thanks for those clues and links - and hints

Don Barron

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