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MathGroup Archive 2001

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Re: How can I creat a user coordinate system for my routine?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26970] Re: How can I creat a user coordinate system for my routine?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 30 Jan 2001 03:38:20 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <94r8bq$ii1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

you want to turn the right handed system used by Mathematica
into a left handed system. This is simply obtained by
setting the ViewVertical option to 

ViewVertical->{0,0,-1}

The projection is now upside down (as usual in a pipe hole
camera) And it is up to you to turn the picture.

You may do the projection by your self using the Plot3Matrix
option. The option is not more documented because it is obsolent
since version 2 of Mathematica but it still seems to work.

Regards
  Jens

liwen liwen wrote:
> 
> Dear friend,
> In mathematica4,the default coordinate system is world
> coordinate system(WCS),for example,on the XOY
> plane,the point pt={10,0} is on the right side of
> original poins {0,0}.Now I want to turn the WCS to be
> a user coordinate system(UCS) in which the direction
> of the Y axis is not changed but that of X axis is
> reversed,what should I do?The UCS must be created
> before running my routines because my routines are
> based on the the UCS but not WCS.
> 
>  Best Regards,
>                 Liwen    1/26/2001
> 
> __________________________________________________
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