[pstricks] What is wrong here?

[no pasaran]

I tried your code and everything seems to be OK (see attachment)
So the problem lies somewhere else (version ?)

Philippe Camus


On 2010-04-30 20:30, Zbigniew Nitecki wrote:
> I'm attaching a file and an output picture.  Briefly, here is the code:
>> \begin{pspicture}(-3.5,-3)(3.5,3.5)
>> \psset{Alpha=90, Beta=30}
>> \multido{\rt=0+20}{18}{%
>> \pstThreeDLine[arrows=->, arrowscale=2, linewidth=2pt, linecolor=gray]%
>> (\rt\space cos 3 mul, \rt\space sin 3 mul, 0)%
>> (\rt\space cos 3 \rt\space 2 div sin 1.5 mul sub mul,%
>> \rt\space sin 3 \rt\space 2 div sin 1.5 mul sub mul,%
>> \rt\space 2 div cos 1.5 mul)%
>> }
>> \parametricplotThreeD[yPlotpoints=100](-1,1)(0,360){
>> u 0.5 mul cos t mul 3 add u cos mul %
>> u 0.5 mul cos t mul 3 add u sin mul %
>> u 0.5 mul sin t mul%
>> }
>> \parametricplotThreeD[plotstyle=curve, linewidth=2pt](0,720){
>> t 0.5 mul cos  3 add t cos mul %
>> t 0.5 mul cos  3 add t sin mul %
>> t 0.5 mul sin%
>> }
>> \parametricplotThreeD[plotstyle=curve, linestyle=dashed, linewidth=2pt]%
>> (0,360){t cos 3 mul t sin 3 mul 0}
>> \end{pspicture}
>
> Note the following features:  the first multido draws gray arrows, 
> whose starting points should lie on the dashed given by the last 
> parametricplot.
>
> I don't see any difference between the coding of the curve and of the 
> starting points (other than \rt in place of u).  Yet look where the 
> arrow start.
>
> What have I done wrong?
>
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>
> 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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