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31 Oct 2024 19:01:45 EDT (-0400)
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From: emitch27
Subject: Re: Camera
Date: 30 Jun 2016 15:25:00
Message: <web.5775716a1e5dc6513595d8da0@news.povray.org>
Le_Forgeron <jgr### [at] freefr> wrote:
> Le 30/06/2016 20:19, emitch27 a écrit :
> >
>
> beware, the perspective camera (default mode without modification) is going to show
strong deformation on each side w
ith such ratio




Is there a way to prevent this distortion? I like this image except the nearest
left corner seems distorted.


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From: emitch27
Subject: Re: Camera
Date: 30 Jun 2016 15:25:01
Message: <web.577571d81e5dc6513595d8da0@news.povray.org>
Doctor John <j.g### [at] gmailcom> wrote:
> On 30/06/16 19:44, emitch27 wrote:
> >
> > I am trying to not zoom out. Is there not a way to show more without zooming
> > out? At the current distance, the image is much clearer. Zooming out would mess
> > that up.
> >
> >
> Do you want something like this (attached)?
>
> John
> --
> It's not about bravery.
> It's about doing what I need to do to win



Yes, but it would I still be able to read text? This seems like it is zoomed out


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From: Doctor John
Subject: Re: Camera
Date: 30 Jun 2016 15:31:40
Message: <5775739c$1@news.povray.org>
On 30/06/16 20:08, Doctor John wrote:
> On 30/06/16 19:44, emitch27 wrote:
>>
>> I am trying to not zoom out. Is there not a way to show more without zooming
>> out? At the current distance, the image is much clearer. Zooming out would mess
>> that up.
>>
>>
> Do you want something like this (attached)?
> 

... or even this?
This time I've zoomed in a fraction

The first image required the camera to be sheared, the second has shear
and zoom.

Code :
//********************************************************************
#include "colors.inc"
#include "textures.inc"
#include "FieldCam3.inc"


#declare CamPos=<6, 2, -10>;
#declare CamLook=<-0.15, 0, 0>;

camera {
        FieldCam ()
        perspective
        location CamPos
        up y
        transform {NoFall}
        look_at CamLook
        direction z*1.5
}

light_source {
 <2, 3, -8>
 White

}


background{ Clear }


box {
 <3.7, 0, 2>, <-4, -.3, -2>
 pigment { Gray25 }

}
//************************************End Code

John
-- 
It's not about bravery.
It's about doing what I need to do to win


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Attachments:
Download 'emitch_test2.png' (10 KB) Download 'us-ascii' (6 KB)

Preview of image 'emitch_test2.png'
emitch_test2.png

From: emitch27
Subject: Re: Camera
Date: 30 Jun 2016 16:05:00
Message: <web.57757a511e5dc6513595d8da0@news.povray.org>
Doctor John <j.g### [at] gmailcom> wrote:
> On 30/06/16 20:08, Doctor John wrote:
> > On 30/06/16 19:44, emitch27 wrote:
> >>
> >> I am trying to not zoom out. Is there not a way to show more without zooming
> >> out? At the current distance, the image is much clearer. Zooming out would mess
> >> that up.
> >>
> >>
> > Do you want something like this (attached)?
> >


>
> John
> --
> It's not about bravery.
> It's about doing what I need to do to win


That is much more helpful. But I feel like this point of view is different from
the original.


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From: Stephen
Subject: Re: Camera
Date: 30 Jun 2016 16:33:44
Message: <57758228$1@news.povray.org>
On 6/30/2016 9:00 PM, emitch27 wrote:

>
> That is much more helpful. But I feel like this point of view is different from
> the original.
>
>

I am glad that you are getting there.
If there is one thing that PovRay will do for you it is show you that 
the camera in the mind's eye. Is much better than any real camera.

If you want to use text in your image. I think you should experiment 
using the text to see how it looks. There is no point in getting the 
scene the way you think it should look. If the important thing (the 
text) is illegible. And remember it will be more readable if you use 
good AA settings.

And Welcome, btw. :)

-- 

Regards
     Stephen


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From: Doctor John
Subject: Re: Camera
Date: 30 Jun 2016 16:36:42
Message: <577582da$1@news.povray.org>
On 30/06/16 21:00, emitch27 wrote:
> 
> That is much more helpful. But I feel like this point of view is different from
> the original.
> 

It is ;-) but, if you think about it there are only a few ways of doing
what you want (and bear in mind that your original code has the camera
pointing 2 pov-units to the right of your object).

1. Zoom out - your object will be visible in its entirety but much
smaller. It will also be on the left of your image.
2. Use a wider angle of view - now you get (perceived) distortion. This
is normal behaviour for all but very specialised lenses. Your object is
also on the left of your image.
3. Do it my way with a shearing matrix. By changing the look_at vector
and shearing to modify the perspective you end up with something very
close to what you originally asked for.

John
-- 
It's not about bravery.
It's about doing what I need to do to win


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From: emitch27
Subject: Re: Camera
Date: 30 Jun 2016 17:10:00
Message: <web.5775898f1e5dc6515b835d160@news.povray.org>
Thank you all for your help. This looks great!


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From: Doctor John
Subject: Re: Camera
Date: 30 Jun 2016 17:21:37
Message: <57758d61$1@news.povray.org>
On 30/06/16 22:05, emitch27 wrote:
> Thank you all for your help. This looks great!
> 

You're welcome. Hope everything goes smoothly from now on.

BTW Don't forget the -uv on the command line whenever you shear the
camera like I did.

Now back to the football: Poland 1 Portugal 1

John
-- 
It's not about bravery.
It's about doing what I need to do to win


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