POV-Ray : Newsgroups : povray.documentation.inbuilt : github #304. Inconsistent camera documentation given camera right vec 1.33 default. : Re: github #304. Inconsistent camera documentation given camera rightvec1.33 default. Server Time
19 May 2024 14:44:52 EDT (-0400)
  Re: github #304. Inconsistent camera documentation given camera rightvec1.33 default.  
From: William F Pokorny
Date: 6 Jul 2017 15:36:32
Message: <595e9140$1@news.povray.org>
On 07/06/2017 02:55 PM, clipka wrote:
> Am 06.07.2017 um 18:31 schrieb William F Pokorny:
>> Anyone know why the right vector perspective camera default is set to a
>> hard coded 1.33 and not 4.0/3.0? Compatibility with old TV standards or
>> something?
> My guess is that it simply was deemed precise enough back in the Amiga
> days (320/1.33 = 240 plus change).
> The quest for backward compatibility presumably did the rest.
Thanks. The github user who recently noticed this, ubuntuslave, posted a 
link to the following newsgroup thread:

http://news.povray.org/povray.beta-test/thread/%3C3### [at] gmxde%3E/

from 2001. I agree with Warp's post in that old thread recommending a 
change to 4.0/3.0 as the default. Any potential compatibility with past 
scenes can be addressed by hard coding a right vector to the current 
default value of 1.33.

The documentation update would then be making the default ratio 4/3 

Today there is a mix of defaults listed. Where all the camera defaults 
listed 1.33 is used. Below when talking about Up and Right vectors the 
default is specified as 4/3. In the Aspect ratio section it is 
right<1.33,0,0> but then claims a resulting aspect ratio of "4 to 3." 
when it is really 3.99 to 3.

Bill P.

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