POV-Ray : Newsgroups : povray.general : Precision problems? : Re: Precision problems? Server Time
14 Apr 2024 03:11:46 EDT (-0400)
  Re: Precision problems?  
From: Ilya Razmanov
Date: 26 Jan 2024 14:02:26
Message: <65b401c2@news.povray.org>
On 26.01.2024 20:54, kurtz le pirate wrote:
> 
> Assuming that the first point of the prism is good : <-0.5,0.25>

Assume object is supposed to be centered at 0,0 and have one of the 
sizes 1.0; in this case - inner diameter 1.0. That gives us inner radius 
0.5 and outer radius 2*0.5/sqrt(3), that is that very "revsqrtof3" in 
source text.

As Cousin Ricky guessed, I, being a hodmandod ("Sam, is this a real 
word?"), instead of revsqrtof3/2 wrote 0.5/2, that is, 0.25. That's the 
only reason of the problem - I messed inner and outer. Since the error 
is pretty irrational (even more irrational than sqrt(3)), I'm unlikely 
to find it ever. Fortunately people here found the problem.

Oh, and why someone relatively sane may want a hexagonal prism have an 
inner diameter of 1.0? To do pictures like attached easily, of course.

Ilyich the Toad


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