[Blindmath] Understanding how to draw 3D objects

[Michael Whapples]

Unfortunately that page is awful to read as there's so many meaningless 
heading structures and distracts from the reading with a screen reader.

However from what I was gathering it sort of is dealing with what I was on 
about. One thing I am not sure of is, the difference between computer 2D and 
3D drawing libraries, and then how these relate to drawing in LaTeX for 
paper documents (if they apply at all to this type of drawing).

After Andrew's message I think I can specify what I need a bit better. I am 
able to create the internal mental 2D image of the object, however this 
image is probably very visual, may be even to the standard of a photo. My 
difficulty is going from that internal image to what lines and other 
elements I need to specify in LaTeX to achieve my mental image, this may 
include what parts of my mental image can I simplify and still maintain the 
affect of the 3D object. As an example, for a torus I probably would still 
use shading to show lighting sources to help show the 3D affect, however the 
torus in the wikibook does not use shading and Andrew didn't say he used any 
shading either, so may be I could get away without using shading (shading 
would have significantly complicated that wikibook drawing, not sure about 
Andrew's drawings). For some reason I seem to think shading for lighting is 
more important on curved surfaces as when drawn on paper you don't have any 
lines showing corners which may indicate a change of direction, IE. while 
simpler to shade correctly, I would see it less important to shade the side 
of a cube.

I think its the decomposing an image into the element parts which is 
difficult, particularly as its more work for me to compare the final result 
with my internal image.

Michael Whapples

-----Original Message----- 
From: Pranav Lal
Sent: Thursday, March 22, 2012 4:49 PM
To: 'Blind Math list for those interested in mathematics'
Subject: Re: [Blindmath] Understanding how to draw 3D objects

Hi Michael,

I don't have an answer but this seems to be a similar question to the one I
posed about 3d to 2d conversion. I suspect you need to do the reverse. See
if the following helps.

http://www.svgopen.org/2008/papers/86-Achieving_3D_Effects_with_SVG/

Pranav


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