[Blindmath] A 3d to 2d description resource?

[Michael Whapples]

Hello,
Having seen a little in the past I do understand 3D a bit, however I think 
the term intuitively does describe that understanding. Its certainly a good 
challenge to come up with such a tutorial.

I personally think there are times its just not worth trying to represent a 
3D image in a tactile diagram. The one example which comes to my mind is not 
a picture but rather diagrams of crystal structures in solid state physics 
(there were some structures I never actually understood until I held a model 
made with balls and sticks and discussed it with the tutor). This example 
does lack certain features which may be in 3D pictures, eg. textures.

Michael Whapples

-----Original Message----- 
From: John Gardner
Sent: Tuesday, January 31, 2012 3:14 AM
To: 'Blind Math list for those interested in mathematics'
Subject: Re: [Blindmath] A 3d to 2d description resource?

Hi Pranav, no ViewPlus doesn't have anything that would help explain how to
draw 2d images of 3d reality.  This seems to be one of the most difficult
things for most congenitively blind people to understand.  As a person who
was sighted for much of my life, I understand it intuitively but have never
tried to explain it to someone who didn't understand it.  The idea of
projection should not be too difficult.  But projection is only a tiny part
of drawing images.  Dick's tree had lines that were supposed to look like
bark.  That is an image of texture - which is somehow much more difficult to
explain.

If anybody would like to organize an archive of images and tutorials that
could explain the principles of 3d to 2d projections understandable by blind
people, it would be a good subject for the www.Access2Science.com web site.

John



-----Original Message-----
From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org] On
Behalf Of Pranav Lal
Sent: Monday, January 30, 2012 5:36 PM
To: blindmath at nfbnet.org
Subject: [Blindmath] A 3d to 2d description resource?

Hi all,

Would it be worth creating a database that listed descriptions of 3d objects
in 2d space? Take my example of a tree. I have felt trees before and can
even see their pictures with the vOICe but how do I map that to the 2d
space? I suspect View Plus already has such a collection but there is no
reference to 3d since SVG is 2d.

Of course, if there is a general approach in mathematics of converting 3d to
2d then all we would need to do is to write about it with some examples and
see if that helps anyone.
Pranav


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