Re: How to draw OUTLINES on 3D shapes?
- To: mathgroup at christensen.cybernetics.net
- Subject: [mg1627] Re: How to draw OUTLINES on 3D shapes?
- From: Zorro <berriz at husc.harvard.edu>
- Date: Fri, 7 Jul 1995 00:33:04 -0400
- Organization: Harvard University, Cambridge, Massachusetts
gfairley at wilder.com (Gerard Fairley) writes: >In comp.soft-sys.math.mathematica Zorro <berriz at husc.harvard.edu> said: >>Hi. I would like to draw 3D shapes (specifically, spheres and >>cylinders) as "filled in outlines". For example, a sphere would >>look like a thin black circle (the outline) around a gray disk (the >>filled-in interior). >I don't know what you mean; I thought the outline of a sphere was a >spherical shell. No, I mean the 2D outline of the 2D representation (as shown on the computer screen) of a sphere. >>Similarly, the outline for a cylinder would be (generally) two >>parallel lines connected by two half-ellipses, one at each end of >>the cylinder. For example, a 2D representation of a cylinder would look something like __________ ()_________) while its *outline* would look like __________ (__________) Similarly, for a cube, a 2D representation would be ______ / /| /_____/ | | | | | | / |_____|/ and the outline of this representation would be ______ / | / | | | | / |______/ It's important to note that I'm not referring to the silhouette (which would be the 2D figure obtained by filling in the figure above, for example) //////// ///////// ///////// ///////// //////// but to the actual 1-dimensional countour we use to represent the *boundary* of the silhoutte. Z.