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MathGroup Archive 1996

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Re: Revealing HiddenSurfaces

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4423] Re: Revealing HiddenSurfaces
  • From: wagner at motel6.cs.colorado.edu (Dave Wagner)
  • Date: Mon, 22 Jul 1996 00:19:23 -0400
  • Organization: University of Colorado, Boulder
  • Sender: owner-wri-mathgroup at wolfram.com

In article <4shuqt$g7n at ralph.vnet.net>,
>
>The problem is that I¹m unable to make the model surface transparent so
>that I can see the error lines of the data points behind the surface.
>Unfortunately Graphics3D doesn¹t have a HiddenSurface option (Plot3D and
>Show do). Is there some way of doing this (maybe converting data to some
>other kind of graphics object)? This has been bugging me and I would

The "guts" of a Graphics3D is a list of Polygon objects.  If you replace
these by Line objects, you'll get a grid with no fill:

    Show[gfx3Dobject /. Polygon[{pt_,pts__}]->Line[{pt,pts,pt}]]

The reason for the fancy footwork with the list of points is that you
need to make the first and last point of the Line primitive be identical
in order for the line to form a closed loop.

		Dave Wagner
		Principia Consulting
		(303) 786-8371
		dbwagner at princon.com
		http://www.princon.com/princon

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