[pstricks] some questions on pst-solide3d

[Juergen Gilg]

Dear Zbigniew,
>
> 1. Where do the limits on the parameters u and v get set?  If I want 
> the width of the band to
> change, where do I modify the code?
They are set within the base=

Play around with the factors of the \defFunction macro -- this one 
defines the function. This function then gets a UNIQUE name -- in this 
case _mobius_ with the variables _u_ and _v_
You can define some other functions in that way with whatever variable 
you like: _s_ and _t_, _x_ and _y_ etc. with another name.

Within the macro \psSolid, you declare:
function=mobius, which calls back the defined function with its declared 
variables.
base = 0.2 0.25 0 pi then sets the range of the variables 
(u[0.2;0.25],v[0;pi])

This is helpful, that you not have to declare what variable names you 
chose -- base does the job automatically.
object=surfaceparametree, defines the kind of object that solides-3d 
predefined -- a function in 2 variables in that case.
ngrid=.025, sets the GRID of the surface -- sometimes need to be set to 
.024 to avoid a division by zero...
>
> 2. what does the !50 after the colors do?
This gives 50 % if intensity to the named color
>
> 3. What is the role of base=...?
To setup the range of the u and v values.

Hope that helps,

Juergen
>
>
> Zbigniew Nitecki
>
> Department of Mathematics
>
> Tufts University
>
> Medford, MA 02155
>
>
> telephones:
>
> Office    (617)627-3843
>
> Dept.    (617)627-3234
>
> Dept. fax    (617)627-3966
>
> http://www.tufts.edu/~znitecki/ <http://www.tufts.edu/%7Eznitecki/>
>
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-- 
 Jürgen Gilg
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