POV-Ray : Newsgroups : povray.general : Non-rolling rotations : Re: Non-rolling rotations Server Time
10 Aug 2024 23:18:05 EDT (-0400)
  Re: Non-rolling rotations  
From: Ken
Date: 12 Oct 1999 20:03:31
Message: <3803CC11.48349ADC@pacbell.net>
"Greg M. Johnson" wrote:
> 
> I have noticed that when I use the standard reorient macros, my actors
> roll along their axis of movement as they travel in a complete circle.
> 
> For example,
> 1) I develop and algorithm that changes the velocity of an actor so that
> it moves in a circle.
> 2) I then use the calculated velocity to reorient an object such as
> reorient (x, new_velocity).
> 3) I find that as I watch the actor complete a full circle, it has also
> rotated about its axis of travel. (In other words, the guy inside the
> craft had better be wearing a seat belt!)  Or, if I use this macro on
> the camera, the ground spins as one travels around in the circle.
> 
> Is there a way to make a change or two to the reorient macro so that
> this does not occur?
> If  yall don't understand what I'm talking about, I can post a small
> animation with the phenomenon...

Came across a new calculator today you might be interested in:

Spin Doctor - This is a calculator that operates on 3D vectors and
rotations, making it an invaluable tool for 3D content and application
developers. A wide variety of operations are provided, from simple
vector addition, to scaling, rotation, and calculation of angles
and lengths.

http://www.vapourtech.com/news.html

-- 
Ken Tyler -  1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/


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