POV-Ray : Newsgroups : povray.general : Help! Can anyone figure this math? : Re: Help! Can anyone figure this math? Server Time
16 Nov 2024 09:22:13 EST (-0500)
  Re: Help! Can anyone figure this math?  
From: Stephen Lavedas
Date: 28 Aug 1998 18:43:03
Message: <35E7248D.1E1DEF8F@Ragingbull.com>
I actually defined a circle above, but you merely have to extrude my
formula on the third axis to create a cylinder... just wanted to
clarify, it doesn't change the validity of the formulii

Stephen Lavedas wrote:
> 
> You are working too hard.  The scaled cylinder is not an ellipse. It is
> merely a cylinder with a scaled axis.  There are several differences,
> not the least of being the definition.  A cylinder is defined easily by
> x = rcos(theta) and y = rsin(theta) (or vis versa) So try working with
> x = rcos(theta)
> y = Rsin(thete)
> 
> so the x position 30 degrees around the cylinder would be r*sqrt(3)/2
> and the y position would be R*0.5 if you move the cylinder, simply add
> the displacement to the values above.
>


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.