Re: [Gnuplot-info] how to draw a sphere that looks like a round sphere

[Zhong R. <re...@uc...>]

Thank you Thomas,

It works well for me.  One additional question: how does
gnuplot decide the rotation center of a 3D object?  For
example, if I do 'splot 0.2*cos(u)*cos(v), cos(u)*sin(v),
sin(u)', the 3D oval swings from one side of my window to the
other when I rotate it.  If I do 'splot 0.1*cos(u)*cos(v),
cos(u)*sin(v), sin(u)', the object swings in and out of the
window.  Can I specify a rotation center?

Zhong


---- Original message ----
>Date: Fri, 22 May 2009 12:55:49 -0700 (PDT)
>From: Thomas Sefzick <t.s...@fz...>  
>Subject: Re: [Gnuplot-info] how to draw a sphere that looks
like a round sphere  
>To: gnu...@li...
>
>
>start with a graphics window which is a square:
>set term <terminal_type> size <XX>, <YY>
>with XX = YY
>
>set view equal xyz
>
>set xyplane relative 0.0
>
>
>renzresearch wrote:
>> 
>> The sphere I draw in parametric mode looks flattened in z
>> direction, even I use 'set view equal xyz'.
>> 
>> I managed to use 'set view equal xy' and 'set view' to change
>> scale and scale_z.  My sphere is now close to round.  The
>> problem is that its vertical size keeps changing when I spin
>> the sphere or resize the window.
>> 
>> Could someone give a hint?  There must be a simple option to
>> make a sphere a perfect sphere no matter how you look at it.
>> 
>> Zhong
>> 
>>
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