POV-Ray : Newsgroups : povray.advanced-users : Re: Partial Rendering of an image to an output file doesnt quite work? Server Time
30 Jul 2024 12:21:47 EDT (-0400)
  Re: Partial Rendering of an image to an output file doesnt quite work? (Message 1 to 4 of 4)  
From: Thorsten Froehlich
Subject: Re: Partial Rendering of an image to an output file doesnt quite work?
Date: 7 Dec 2003 17:23:43
Message: <3fd3a86f$1@news.povray.org>
In article <3fd3895a$1@news.povray.org> , "Bob Zigon" 
<nos### [at] iquestnet> wrote:
> Gang

Please do not multipost messages.  Cross-post instead.

> The dimensions are correct. and the X offset is correct. But the Y offset is
> 0 so it is shifted
> up against the top of the BMP.
>
> I looked at the MESSAGES window and it said
>
> "Output Options
>   Image resolution 640 by 480 (rows 94 to 306, columns 188 to 423)."
>
> The values are correct but the resulting BMP is incorrect.
>
> Is this a bug or am I doing something wrong?

As POV-Ray always writes the whole image, whatever you are seeing is correct
and your expectation is incorrect.  I don't really get what you expect
versus what you see, but POV-Ray will render the selected area and leave the
whole image empty around it.  Thus, this sounds a lot like you are making an
incorrect selection for the area you are up to.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: Slime
Subject: Re: Partial Rendering of an image to an output file doesnt quite work?
Date: 7 Dec 2003 18:14:39
Message: <3fd3b45f$1@news.povray.org>
> but POV-Ray will render the selected area and leave the
> whole image empty around it.

What POV-Ray does, and what he's talking about, is renders the selected area
in the wrong area of the output image.

For instance, if you select a square at the center of your image, the
outputted file will be black everywhere but the *top* middle, where your
selected render will appear. One would expect blackness everywhere but the
*center*, which is where your selection was.

It's hard to explain exactly. If you haven't seen it before, then take any
old image, select a small square to render somewhere near the center of the
image, and then view the output image (not just POV-Ray's display), and note
the difference between the output image and what POV-Ray displayed.

 - Slime
 [ http://www.slimeland.com/ ]


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From: Thorsten Froehlich
Subject: Re: Partial Rendering of an image to an output file doesnt quite work?
Date: 8 Dec 2003 04:04:51
Message: <3fd43eb3@news.povray.org>
In article <3fd3b45f$1@news.povray.org> , "Slime" <fak### [at] emailaddress> 
wrote:

> What POV-Ray does, and what he's talking about, is renders the selected area
> in the wrong area of the output image.
>
> For instance, if you select a square at the center of your image, the
> outputted file will be black everywhere but the *top* middle, where your
> selected render will appear. One would expect blackness everywhere but the
> *center*, which is where your selection was.

No, you are wrong interpreting what you are seeing.  POV-Ray simply outputs
only the rows which contains the rendered area.  However, the image is
specified to have a certain height and width.  What you see outside the
rendered area when viewing this image is completely up to your image viewing
program.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: Chris Johnson
Subject: Re: Partial Rendering of an image to an output file doesnt quite work?
Date: 8 Dec 2003 21:40:35
Message: <3fd53623@news.povray.org>
-[POV-Ray simply outputs only the rows which contains the rendered area]-
This certainly isn't the case for .bmp format.

-Chris


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