how to draw a sphere that looks like a round sphere
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how to draw a sphere that looks like a round sphere
by renzresearch
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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 ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Gnuplot-info mailing list Gnuplot-info@... https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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Re: how to draw a sphere that looks like a round sphere
by Thomas Sefzick
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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
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Re: how to draw a sphere that looks like a round sphere
by Thomas Sefzick
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Rate this Message:
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
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Re: how to draw a sphere that looks like a round sphere
by renzresearch
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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 >> >> >> Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT >> is a gathering of tech-side developers & brand creativity professionals. >> Meet >> the minds behind Google Creative Lab, Visual Complexity, Processing, & >> iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian >> Group, R/GA, & Big Spaceship. http://www.creativitycat.com >> _______________________________________________ >> Gnuplot-info mailing list >> Gnuplot-info@... >> https://lists.sourceforge.net/lists/listinfo/gnuplot-info >> >> > >-- >View this message in context: >Sent from the Gnuplot - User mailing list archive at Nabble.com. > > >------------------------------------------------------------------------------ >Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT >is a gathering of tech-side developers & brand creativity professionals. Meet >the minds behind Google Creative Lab, Visual Complexity, Processing, & >iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian >Group, R/GA, & Big Spaceship. http://www.creativitycat.com >_______________________________________________ >Gnuplot-info mailing list >Gnuplot-info@... >https://lists.sourceforge.net/lists/listinfo/gnuplot-info ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Gnuplot-info mailing list Gnuplot-info@... https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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Re: how to draw a sphere that looks like a round sphere
by Thomas Sefzick
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oh, what's that?
seems that there is an offset somehow reciprocal to the axis length. this simple example shows the problem: set view equal xyz set xrange [-0.2:0.2] set yrange [-1:1] set zrange [-1:1] splot sin(x**2+y**2) has to do something with the calculation of 'xcenter3d', 'ycenter3d' and 'zcenter3d' in 'graph3d.c'. i'll try to find out how it works...
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Re: how to draw a sphere that looks like a round sphere
by Thomas Sefzick
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i uploaded this patch to sourceforge:
graph3d.patch
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