POV-Ray : Newsgroups : povray.windows : Force save incomplete output? : Re: Force save incomplete output? Server Time
20 Mar 2023 23:35:57 EDT (-0400)
  Re: Force save incomplete output?  
From: Alain
Date: 23 Feb 2018 08:45:40
Message: <5a901b04$1@news.povray.org>
Le 18-02-23 à 08:25, Mike Horvath a écrit :
> On 2/23/2018 6:58 AM, Kenneth wrote:
>> clipka <ano### [at] anonymousorg> wrote:
>>
>>>
>>> Nope.
>>
>> IIRC, some older versions did... at least with Windows-specific .BMP 
>> renders
>> (which is how I used to run POV-Ray.) Maybe 3.6.1 or 3.6.2? I remember 
>> stopping
>> some time-consuming renders and taking a look at them. (But not 
>> partial PNG
>> renders-- they didn't open. I'm guessing that some kind of 'header' file
>> information was missing..) This was before the 'state' file 
>> implementation in
>> 3.7.0(?)
>>
>>
>>
>>
>>
> 
> 
> BMP is uncompressed, so I'm guessing each pixel is appended 
> sequentially, and a partial image will display by default.
> 
> PNG images are maybe compressed *after* all the pixels have been written.
> 
> Forcing output could still be done however. But continuing a stopped 
> render may no longer be possible afterward.
> 
> 
> Mike

Before 3.7, PNG images where compressed one line at a time. Render a 
line, compress THAT line, save to file with the previous lines.
In my case, I was able to open incomplete renders saved as PNG with 
IrfanView. Some other viewers could have dificulty for those.


Alain


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