POV-Ray : Newsgroups : povray.tools.general : Norbert Kern's 'Position-Finder' code-- redux : Re: Norbert Kern's 'Position-Finder' code-- redux Server Time
15 Apr 2024 14:03:54 EDT (-0400)
  Re: Norbert Kern's 'Position-Finder' code-- redux  
From: Thomas de Groot
Date: 26 Sep 2018 02:33:04
Message: <5bab2820$1@news.povray.org>
On 25-9-2018 22:12, Kenneth wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>>> I like it! I really do, and I shall replace my own version with yours.
>>> I may re-instate my 'kludge' fixes for some of the remaining traced 'normal'
>>> behavior...
> I've just come across another subtle flaw in the code-- NOT normal-related--
> that's probably been there since my *early* experiments. I  may have introduced
> it with my own fixes, I don't know. Basically, *sometimes* the arrow or 'new'
> object suddenly flips from one side of the preview render to the other. But it
> happens only with certain juxtapositions of camera and lookat point, and their
> positions relative to the x/y plane at the origin. It's strange that I didn't
> see this flaw previously,  even after 100-plus tests of the code! (All my
> previsous tests just happened to avoid this situation, amazingly.)
> Luckily, I've been able to deduce the 'rules' that govern this behavior, so I'll
> add a fix for it-- as soon as I figure out how ;-)

That is strange and I have no clue - nor experience - about this.

Something else though, troubles me from even before your work. There are 
scenes where the results from the trace are significantly away from the 
initial screen position given to the macro. I shall try to get a demo 
scene together where this is demonstrated.


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