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MathGroup Archive 2001

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RE: Re: Text Statements in 3D Graphics

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31593] RE: [mg31573] Re: Text Statements in 3D Graphics
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 15 Nov 2001 05:52:26 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Jens,

But I am proposing that if location in Text[text,location,...] is hidden
then the entire text is suppressed. That seems to be simple and reasonable.
Mathematica would only have to check if a single point is hidden.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

> From: Jens-Peer Kuska [mailto:kuska at informatik.uni-leipzig.de]
To: mathgroup at smc.vnet.net
>
> Hi,
>
> this can't work because, true 3d text would require
> that the outlines of the characters in Text[] are converted into
> 3d polygones, otherwise Mathematica's hidden line removal can't find out
> if the polygons from the characters are hidden by any other polygon.
>
> Regards
>   Jens
>
> David Park wrote:
> >
> > Dear MathGroup
> >
> > Mathematica treats text in 3D graphics so that it is projected
> forward and
> > is always visible. In other words, text is never hidden behind
> a surface.
> > However, this is often undesirable. Suppose one wishes to label certain
> > points on a 3D object and then rotate it with SpinShow. It is
> better not to
> > display the text labels that are behind the surface. Otherwise the eye
> > naturally attaches the label to the part of the surface that
> can be seen,
> > not to speak of text clutter if there are a number of labeled points. It
> > would be much nicer if there were an option to suppress Text
> statements if
> > the application point is hidden. Perhaps this should even be the normal
> > behavior. Text in 3D which should always show can be added with
> the Epilog
> > option.
> >
> > David Park
> > djmp at earthlink.net
> > http://home.earthlink.net/~djmp/
>



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