POV-Ray : Newsgroups : povray.bugreports : aspect ratio cannot be manually set Server Time: 18 Jan 2019 00:59:56 GMT
  aspect ratio cannot be manually set (Message 1 to 4 of 4)  
From: jmichae3
Subject: aspect ratio cannot be manually set
Date: 29 Apr 2017 20:15:00
Message: <web.5904f4344fe2aeaf944c3db40@news.povray.org>
I have a dual-monitor setup, once it was a 3-monitor setup.
so I wanted to make desktop wallpaper. I knew width had to be 3x, so I tried it,
and I got vertically squeezed images. so I know the aspect ratio is wrong. it's
/still/ 16:9 despite 3 monitors.  and after looking in the manual, there is no
way to set the aspect ratio manually (would prefer it be in the .ini).

so I looked at panorama shot. those little box cams do that. but the method used
by pov needs to be improved. but I did get my sign finished, for now, and POV is
nice to have.


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From: jmichae3
Subject: Re: aspect ratio cannot be manually set
Date: 29 Apr 2017 20:40:00
Message: <web.5904f941c2628cde944c3db40@news.povray.org>
"jmichae3" <jmi### [at] yahoocom> wrote:
> I have a dual-monitor setup, once it was a 3-monitor setup.
> so I wanted to make desktop wallpaper. I knew width had to be 3x, so I tried it,
> and I got vertically squeezed images. so I know the aspect ratio is wrong. it's
> /still/ 16:9 despite 3 monitors.  and after looking in the manual, there is no
> way to set the aspect ratio manually (would prefer it be in the .ini).
>
> so I looked at panorama shot. those little box cams do that. but the method used
> by pov needs to be improved. but I did get my sign finished, for now, and POV is
> nice to have.

I found out you can manually set aspect ratio, with up and right in the camera.


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From: Kenneth
Subject: Re: aspect ratio cannot be manually set
Date: 30 Apr 2017 01:25:01
Message: <web.59053c6dc2628cde883fb31c0@news.povray.org>
"jmichae3" <jmi### [at] yahoocom> wrote:

>
> I found out you can manually set aspect ratio, with up and right in the camera.

There's at least one other way of doing it:

Use your 'usual' camera set-up, like this for example...

camera{ location  <20,40,28>
        right     x*image_width/image_height // keeps the scene's object
// proportions the same, with any .ini file aspect ratio
        look_at   <0,2,0>
        angle 67
      }

.... then change your output image resolution (in your QUICKRES.INI file) to make
a panorama-aspect image. Instead of a 16:9 ratio, use a (16*3):9 ratio. By
itself, that will produce a long length/short height image, cutting off the top
and bottom of the scane, but with the scene's objects still looking correct. To
fix that-- to get the scene's vertical field-of-view back to where it should
be-- simply change the camera's ANGLE to take in more of the scene; a
wider-angle 'lens', in other words. There is probably a simple(?) formula for
choosing the correct angle-- but I don't know what it is, off-hand. OR, you
could move the camera back in space, and leave the angle as-is.


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From: Kenneth
Subject: Re: aspect ratio cannot be manually set
Date: 30 Apr 2017 01:30:01
Message: <web.59053dfcc2628cde883fb31c0@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:

>
> .... Instead of a 16:9 ratio, use a (16*3):9 ratio.

Oops, I meant (16*2):9, for your TWO-monitor set-up.


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