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Re: how to draw a sphere that looks like a round sphere

by renzresearch :: Rate this Message:

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.sefzick@...>
>Subject: Re: [Gnuplot-info] how to draw a sphere that looks
like a round sphere

>To: gnuplot-info@...
>
>
>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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