POV-Ray : Newsgroups : povray.unofficial.patches : vectors.inc Attn: Tor Olav (povr branch work) : Re: vectors.inc Attn: Tor Olav (povr branch work) Server Time
10 Aug 2022 17:05:46 EDT (-0400)
  Re: vectors.inc Attn: Tor Olav (povr branch work)  
From: William F Pokorny
Date: 28 May 2021 23:21:03
Message: <60b1b31f$1@news.povray.org>
On 5/28/21 9:41 PM, Bald Eagle wrote:
> "Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
> 
>> To fix this I would prefer to change the order of the "ifs" in the
>> OrthogonalVector() macro.
>>
>> If the old VPerp_To_Vector() macro is changed to call (wrap) the new
>> OrthogonalVector() with reordered "ifs", it will break scenes using the
>> VPerp_To_Vector() macro.
>>
>> So now I'm not sure what to do...
> 
> 2 things here:
> 
> 1.  I may be wrong, but I was under the impression that povr is a fork, and it's
> purpose is to improve and fix some longstanding issues with the official povray
> source code.  So breaking older scenes is probably not the primary concern.

Yes, the povr branch breaks what it needs to break to fix longstanding 
issues - and to evolve more radically(1). It's a big part of the aim of 
of it.  So yep, the change likely doesn't matter even if it does break 
something...

(1) - So I can try more of what I want to try... :-)

> 
> 2.  I thought that this was what the #version directive was for.  Can't you
> sniff the scene version and include a fork in the wrapper?   If the version is
> old, use the old way, and if it's new, use the new way?

I suppose, but I'm trying to avoid as much of that sort of thing as 
possible with povr. I've been ripping out backward compatibility stuff 
as I can for a long time now and there is still lots of it in there...

Rambling. At a high level I think about the ever backward comparability 
in POV-Ray proper and it's kind of amazing it's been kept up. I mean it 
all more or less works! For what I'm doing it's just not possible in 
many cases - hammer in hand, I'm  breaking stuff.

Bill P.


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