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From: Zhong R. <re...@uc...> - 2009-05-22 05:35:03
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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 |
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From: Thomas S. <t.s...@fz...> - 2009-05-22 19:52:41
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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 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 > Gnu...@li... > https://lists.sourceforge.net/lists/listinfo/gnuplot-info > > -- View this message in context: http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23676646.html Sent from the Gnuplot - User mailing list archive at Nabble.com. |
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From: Thomas S. <t.s...@fz...> - 2009-05-22 19:56:05
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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 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 > Gnu...@li... > https://lists.sourceforge.net/lists/listinfo/gnuplot-info > > -- View this message in context: http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23676649.html Sent from the Gnuplot - User mailing list archive at Nabble.com. |
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From: Zhong R. <re...@uc...> - 2009-05-26 19:18:42
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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.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 >> >> ------------------------------------------------------------------------------ >> 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 >> Gnu...@li... >> https://lists.sourceforge.net/lists/listinfo/gnuplot-info >> >> > >-- >View this message in context: http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23676649.html >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 >Gnu...@li... >https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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From: Thomas S. <t.s...@fz...> - 2009-05-26 21:00:24
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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... renzresearch wrote: > > 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 >>> >>> > ------------------------------------------------------------------------------ >>> 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 >>> Gnu...@li... >>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info >>> >>> >> >>-- >>View this message in context: > http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23676649.html >>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 >>Gnu...@li... >>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 > Gnu...@li... > https://lists.sourceforge.net/lists/listinfo/gnuplot-info > > -- View this message in context: http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23731261.html Sent from the Gnuplot - User mailing list archive at Nabble.com. |
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From: Thomas S. <t.s...@fz...> - 2009-05-27 07:44:05
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i uploaded this patch to sourceforge: http://www.nabble.com/file/p23737622/graph3d.patch graph3d.patch Thomas Sefzick wrote: > > 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... > > > renzresearch wrote: >> >> 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 >>>> >>>> >> ------------------------------------------------------------------------------ >>>> 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 >>>> Gnu...@li... >>>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info >>>> >>>> >>> >>>-- >>>View this message in context: >> http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23676649.html >>>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 >>>Gnu...@li... >>>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 >> Gnu...@li... >> https://lists.sourceforge.net/lists/listinfo/gnuplot-info >> >> > > -- View this message in context: http://www.nabble.com/how-to-draw-a-sphere-that-looks-like-a-round-sphere-tp23664704p23737622.html Sent from the Gnuplot - User mailing list archive at Nabble.com. |