**From:** Bathsheba Grossman (*sheba@bathsheba.com*)

**Date:** Wed Apr 09 2003 - 04:11:53 EEST

**Next message:**Ismo Mäkelä: "Re: Projective Geometry in a CAD Program"**Previous message:**Jonathan Chertok: "Projective Geometry in a CAD Program"**In reply to:**Jonathan Chertok: "Projective Geometry in a CAD Program"**Next in thread:**Ismo Mäkelä: "Re: Projective Geometry in a CAD Program"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

On Tue, 8 Apr 2003, Jonathan Chertok wrote:

*> A. Does anyone know of a CAD program within which one can conveniently do
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*> "projective geometry".
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*>
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*> I am hoping for a 3D program within which I can set up a couple of "planes"
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*> in order to project lines to create a 3D object from a series of elevations -
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*> or to create a series of elevations from a 3D object. I suppose an ability to
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*> snap to a plane and to create a perpendicular to this line would be useful.
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Rhinoceros would work.

*> B. Similarly, I am wondering if there is a program within which one might
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*> have a command "Project Outline" or "Find Points in this Section" which would
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*> yield information in the form of points or lines from which I could construct
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*> additional drawings.
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*> Here I am hoping for a 3D program which would allow me to construct a 3D
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*> shape - take sections or elevations of it - and then construct additional
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*> drawings using this "section" or "outline" information.
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I am not really understanding what you want here, but Rhino has a

Project command which takes curves to a plane; it also has Intersect

and Contour commands for taking cross-sections through objects. It

does not easily produce 2D drawings, but I should think it would solve

the 3D part of the problem.

-Sheba

-- Bathsheba Grossman phone (831)429-8224, fax (831)460-1242 Sculpting geometry bathsheba.com Solidscape prototyping protoshape.com

**Next message:**Ismo Mäkelä: "Re: Projective Geometry in a CAD Program"**Previous message:**Jonathan Chertok: "Projective Geometry in a CAD Program"**In reply to:**Jonathan Chertok: "Projective Geometry in a CAD Program"**Next in thread:**Ismo Mäkelä: "Re: Projective Geometry in a CAD Program"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

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