POV-Ray : Newsgroups : povray.bugreports : Bug in screen.inc Server Time: 22 Jul 2019 22:26:29 GMT
  Bug in screen.inc (Message 1 to 7 of 7)  
From: Mike Horvath
Subject: Bug in screen.inc
Date: 20 Jun 2019 17:06:50
Message: <5d0bbd2a$1@news.povray.org>
The include file "screen.inc" can't cope whith a scene (such as some 
exported LDraw scenes) where the "right" vector of the camera is 
negative. For instance, I'm not sure why, but the program LDView always 
outputs the right vector as:

	right LDXCamAspect * < -1,0,0 >

The resulting image ends up flipped horizontally compared to what it's 
supposed to be.

Michael


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From: Bald Eagle
Subject: Re: Bug in screen.inc
Date: 20 Jun 2019 22:50:01
Message: <web.5d0c0caee42763204eec112d0@news.povray.org>
Mike Horvath <mik### [at] gmailcom> wrote:
> The include file "screen.inc" can't cope whith a scene (such as some
> exported LDraw scenes) where the "right" vector of the camera is
> negative. For instance, I'm not sure why, but the program LDView always
> outputs the right vector as:
>
>  right LDXCamAspect * < -1,0,0 >
>
> The resulting image ends up flipped horizontally compared to what it's
> supposed to be.
>
> Michael

It's been a while since I've picked through the code of that, but:

Might the solution be as simple as taking all of the screen.inc output (union {}
)
 and scaling it <-1, 1, 1>  ?


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From: Mike Horvath
Subject: Re: Bug in screen.inc
Date: 21 Jun 2019 01:04:49
Message: <5d0c2d31$1@news.povray.org>
On 6/20/2019 6:46 PM, Bald Eagle wrote:
> It's been a while since I've picked through the code of that, but:
> 
> Might the solution be as simple as taking all of the screen.inc output (union {}
> )
>   and scaling it <-1, 1, 1>  ?
> 
> 
> 

Can the camera itself scale by some value? Thanks for the tip.


Michael


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From: Bald Eagle
Subject: Re: Bug in screen.inc
Date: 21 Jun 2019 01:20:00
Message: <web.5d0c2ff7e42763204eec112d0@news.povray.org>
Mike Horvath <mik### [at] gmailcom> wrote:

> Can the camera itself scale by some value? Thanks for the tip.

I'm guessing ... yes?

http://news.povray.org/povray.advanced-users/thread/%3C5a7f9271%241%40news.povray.org%3E/


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From: Mike Horvath
Subject: Re: Bug in screen.inc
Date: 21 Jun 2019 02:33:45
Message: <5d0c4209$1@news.povray.org>
On 6/20/2019 9:16 PM, Bald Eagle wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:
> 
>> Can the camera itself scale by some value? Thanks for the tip.
> 
> I'm guessing ... yes?
> 
>
http://news.povray.org/povray.advanced-users/thread/%3C5a7f9271%241%40news.povray.org%3E/
> 

I tried `scale <-1,1,1>` but it had the incorrect effect. It flipped the 
coordinate axes, not the actual image like what should happen.


Michael


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From: Mike Horvath
Subject: Re: Bug in screen.inc
Date: 21 Jun 2019 21:41:56
Message: <5d0d4f24$1@news.povray.org>
On 6/20/2019 9:16 PM, Bald Eagle wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:
> 
>> Can the camera itself scale by some value? Thanks for the tip.
> 
> I'm guessing ... yes?
> 
>
http://news.povray.org/povray.advanced-users/thread/%3C5a7f9271%241%40news.povray.org%3E/
> 
> 
> 
> 
> 


I also tried setting the aspect ratio to a negative value.

Set_Camera_Aspect(-4,3)

This flips the image correctly, but the text disappears. You can confirm 
this in the demo scene.


Michael


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From: Mike Horvath
Subject: Re: Bug in screen.inc
Date: 22 Jun 2019 13:05:04
Message: <5d0e2780$1@news.povray.org>
Sorry, I will post an example scene later in the day when I get the chance.


Michael


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