MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Viewpoint Scaling

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16681] Re: Viewpoint Scaling
  • From: Martin Kraus <mkraus at theorie3.physik.uni-erlangen.de>
  • Date: Sat, 20 Mar 1999 02:08:57 -0500
  • Organization: Regionales Rechenzentrum Erlangen, Germany
  • References: <7ct71g$8aa@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Naum Phleger wrote:
> 
>     I have received lots of help, but what I really want to know is the
> algorithm that is used to scale the points in the ViewPoint option for 3D
> graphics. Here is a simple example that illustrates the problem.  Here are
> the points that I want to view my globe from (in {x,y,z} form).
> 
> {1,0,0} {sqrt 2, sqrt 2,0} {1,0,0} {-sqrt 2,sqrt 2, 0} {-1,0,0}, ...
> 
> or in {r,theta,fi} form
> 
> {1,0,0} {1,0,pi/4} {1,0,pi/2} {1,0,3pi/4} {1,0,pi} ...
> 
> The problem I have is that with this list, the odd points give a smaller
> image back, and it is of set because the box is oriented differently.
> 
>     What I want to do is enter my view points in such a way that the only
> difference between successive images is a rotation, no translation or
> scaling.  Where can I find the algorithm that Viewpoints uses?  Thank you
> for any help.
> --
> 
> Naum Phleger

If I understand you correctly the Graphics3D option
SphericalRegion->True 
does what you want automatically.

Greetings

Martin Kraus


  • Prev by Date: Re: Commutators and Operator Powers in Mathematica
  • Next by Date: Re: plot bug
  • Previous by thread: Viewpoint Scaling
  • Next by thread: Re: Viewpoint Scaling