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On 7/19/2017 1:01 PM, Bald Eagle wrote:
> "Kenneth" <kdw### [at] gmail com> wrote:
>
>> Thanks for posting this link. I need as many sources as I can find, to help me
>> further understand how a matrix works, and its many uses.
>
> Well, I'm sure there are many different types of matrix - and the graphics /
> camera / projection matrix is a special application.
>
>> For example, the real magic of Rune's ILLUSION.INC include file lies in
>> his use of a matrix, with amazing results. I'm still trying to understand what
>> he did!)
>
> Just by taking a quick look at the code, (I've never used it, and the sample
> file output makes no sense to me) I'd have to say that it just takes a "flat"
> image and skews it - stretches it - so that it fits / lines up correctly with
> the field of view from the camera position - a perspective correction.
>
I've used it and would say it more translates the rays than skews them.
> This is also something I need to look into, and have only briefly played with it
> to correct some perspective distortion of photographed flat surfaces.
>
> I'm sure it could be harnessed to do some basic photogrammetry, if I ever live
> that long, have enough round tuits, and triple my caffeine intake. ;)
>
> Glad you can use the link - it looked like a good one. Lohmueller of course
> has some examples on his page[s] as well, and many examples are available via
> the insert menu.
>
>
You might be interested in Dr. John's FieldCam macro.
>
> Greetings, all. I have a macro that simulates a shifted lens which may
> help you. I will repost it in p.b.s-f. as FieldCam.zip. In the zip are
> three folders; one for Mac users, one for Unix users and one for M$
> users. Hope it helps
http://news.povray.org/povray.binaries.scene-files/thread/%3C48400449$1@news.povray.org%3E/?ttop=328092&toff=50
--
Regards
Stephen
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