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Re: Re: Bug associated with Graphics3D???

  • To: mathgroup at smc.vnet.net
  • Subject: [mg105271] Re: [mg105254] Re: [mg105210] Bug associated with Graphics3D???
  • From: Syd Geraghty <sydgeraghty at me.com>
  • Date: Wed, 25 Nov 2009 23:01:16 -0500 (EST)
  • References: <200911241050.FAA00829@smc.vnet.net>

Lou,

I guess from your results below that a bug report to WRI is in order.

Cheers .... Syd

Incidentally your analysis reminds me of a design problem I had in 1966.

The problem was to optimise the shape of the two surfaces of a high-gain cassegraine antenna given
the radial characteristics of the microwave source located about where your point is. 

The antenna ended up on the UK AWAC aircraft of that era.

I programmed in Algol in those days on an Elliott Automation 803.

Boy how I would like to have had Mathematica and a Mac in 1966!



Syd Geraghty B.Sc, M.Sc.

sydgeraghty at mac.com

Mathematica 7.0.1.0 for Mac OS X x86 (64 - bit) (12th September 2009)
MacOS X V 10.6.1 Snow Leopard 
MacBook Pro 2.33 GHz Intel Core 2 Duo  2GB RAM





On Nov 25, 2009, at 6:13 AM, Louis Talman wrote:

> Well, sort of.  Reversing the order of the Graphics3D objects  
> introduces something else I don't want, which is a box of varying  
> size.  And if I transfer the PlotRange option to Pla[x] to control box  
> size, the 5.1 issue reappears!
> 
> I forgot to mention a couple of things.  The issue pertains only to  
> v7; the code works as it should in v6---at least on a PPC Mac.  And  
> I've verified the problem in v7 on both a PPC Mac running OS X 10.5.8  
> and on a Windoze box running Vista Home Premium.  And tweaking  
> ViewPoint doesn't help.  (Haven't tried a major change---but the  
> problem seems so sensitive to position that a little tweak in  
> ViewPoint should've done something if lighting angles are the issue.)




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