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MathGroup Archive 1996

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Re: BitMap form

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4104] Re: BitMap form
  • From: Harald Berndt <haraldb at nature.berkeley.edu>
  • Date: Tue, 4 Jun 1996 02:19:03 -0400
  • Organization: University of California Forest Products Lab
  • Sender: owner-wri-mathgroup at wolfram.com

Dale E. Newbury wrote:
> 
>         I wish to model a structure using a BitMap form, with Mathematica.
> This is different than the normal vector space that Mathematica functions
> in.  I searched for help in Mathematica Textbooks and Journals and I have
> even tried my luck at Mathemtica Programming, but to no success.  I was
> wondering if you had any advice to send my way or if you knew how to solve
> this BitMap problem.
>         To elaborate on the kind of BitMap that I am looking to create, I
> would like to create both 2dimensional and 3dimensional bitmaps,with
> different surfaces and/or solids represented by different numbers.  Thanks
> for your help.
> 
> Sincerely,
> John Kessler
> 
> (301)9752552
> s315928 at gettysburg.edu
> 
> Note that this message is being sent from my place of summer employment.
> Messages can be sent back to this e-mail address at NIST:
> dale.newbury at nist.gov

This question appeared twice in my current browse of the newsgroup, so 
I thought I'll give it a whirl:

I'm not sure I understand what "modeling a structure in bitmap form" 
means, but I propose the definition "sampled on a finite grid." So, an 
n-dimensional bitmap is simply an n-dimensional array. To build them, 
sample the function in question (e.g. using the Table[] function). To 
display 2D bitmaps, use ListDensityPlot (very vesatile function, 
that!). For 3D bitmaps (the datapoints would be voxels, in the 
jargon), one needs to improvise. In Mathematica itself, Tom 
Wickham-Jones' ListDensityPlot3D (I think) works under some 
circumstances. I have written (well, hacked. It's rough but it works) 
a function for writing 3D data arrays to files that Spyglass Dicer can 
read. Then I use Dicer for image creation and manipulation.

I hope this helps. If I missed the point regarding your particular 
problem, e-mail me.
-- 
_______________________________________________________________
Harald Berndt                          University of California
Research Specialist                  Forest Products Laboratory
Phone: 510-215-4224                            FAX:510-215-4299
_______________________________________________________________



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