POV-Ray: Newsgroups: povray.bugreports: Subimage rendering bug: Re: Subimage rendering bug

POV-Ray : Newsgroups : povray.bugreports : Subimage rendering bug : Re: Subimage rendering bug		Server Time 3 May 2024 16:34:55 EDT (-0400)

From: clipka
Date: 4 Jun 2011 17:20:07
Message: <4deaa187$1@news.povray.org>

Am 04.06.2011 22:56, schrieb Marvin:

> I have found what seems to be a bug in povray for Linux 3.6.1
>
> Persistence of Vision(tm) Ray Tracer Version 3.6.1 (g++ 4.1.2 @
>   x86_64-unknown-linux-gnu)
>
> The bug is seen in what follows:
>
> $ povray +FN +W400 +H300 +SC300 +EC399 +Omodel-000001.png radiosity3a.pov
> $ model-000001.png PNG 400x300 400x300+299+0 8-bit DirectClass 21.9kb
> $ povray +FN +W400 +H300 +SR0 +ER99 +SC300 +EC399 +Omodel-000001.png
> radiosity3a.pov
> $ identify model-000001.png                                   identify: Not
> enough image data `model-000001.png'.
> identify: Corrupt image `model-000001.png'.
>
> The problem seems to be in povray itself, since partial column rendering
> produces correct image with same model, which is library example with came walk
> around introduced.

This behaviour, while indeed incompatible with the PNG file format, is 
(or rather was) intentional. Old versions of POV-Ray (including 3.6x) 
used to do some pretty whacky things with some image formats.

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