Antoine Monmayrant |
Hi all,
I am a bit surprised by the way isoview acts on a surf plot. It seems to just scale the x,y,z axis so that the plot is inside an isometric 3D cube. I was expecting an aspect ratio that depends on the Z matrix value and size or on the X,Y coordinate vectors and the Z matrix value. Here is an example: //without X,Y axis: expecting an aspect ratio in the (x,y) plan corresponding to the dimensions of the Z matrix Z=rand(10,30); h=scf(); surf(Z); isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but we have square //trying with X,Y coordinates: expecting an the plot to fit inside a "cube" with aspect ratios along the x,y & z directions //that depends on max(X)-min(X), max(Y)-min(Y) & max(Z)-min(Z) Z=rand(10,30); X=1:size(Z,2); Y=1:size(Z,1); h=scf(); surf(X,Y,Z); isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but we have square Am I the only one to expect this behaviour? Antoine -- +++++++++++++++++++++++++++++++++++++++++++++++++++++++ Antoine Monmayrant LAAS - CNRS 7 avenue du Colonel Roche BP 54200 31031 TOULOUSE Cedex 4 FRANCE Tel:+33 5 61 33 64 59 email : [hidden email] permanent email : [hidden email] +++++++++++++++++++++++++++++++++++++++++++++++++++++++ _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users |
Antoine Monmayrant |
OK, answering my own question:
It seems that when calling surf(), the cube_scaling property of the current axis is set to "on", which results in the observed behaviour. Manually resetting to its default value "off", gives me the expected behaviour. Should I fill a bug about the absence of cube_scaling mention on the help pages of surf() and isoview() ? Antoine Le 21/02/2018 à 10:59, Antoine Monmayrant a écrit : > Hi all, > > > I am a bit surprised by the way isoview acts on a surf plot. > It seems to just scale the x,y,z axis so that the plot is inside an > isometric 3D cube. > I was expecting an aspect ratio that depends on the Z matrix value and > size or on the X,Y coordinate vectors and the Z matrix value. > Here is an example: > > //without X,Y axis: expecting an aspect ratio in the (x,y) plan > corresponding to the dimensions of the Z matrix > Z=rand(10,30); > h=scf(); > surf(Z); > isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but > we have square > > //trying with X,Y coordinates: expecting an the plot to fit inside a > "cube" with aspect ratios along the x,y & z directions > //that depends on max(X)-min(X), max(Y)-min(Y) & max(Z)-min(Z) > Z=rand(10,30); > X=1:size(Z,2); > Y=1:size(Z,1); > h=scf(); > surf(X,Y,Z); > isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but > we have square > > > Am I the only one to expect this behaviour? > > > Antoine > > > -- +++++++++++++++++++++++++++++++++++++++++++++++++++++++ Antoine Monmayrant LAAS - CNRS 7 avenue du Colonel Roche BP 54200 31031 TOULOUSE Cedex 4 FRANCE Tel:+33 5 61 33 64 59 email : [hidden email] permanent email : [hidden email] +++++++++++++++++++++++++++++++++++++++++++++++++++++++ _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users |
Hello,
The cube_scaling appeared with version 5.2 or 5.3 (I don't remember) because the previous default behavior, which corresponds to cube_scaling="off" could produce surfaces which were very hard to visualize with default angles and hard to homogeneously "rotate" in the elevation angle, when the surface is very flat. See this example: clf [x,y]=meshgrid(-1:0.1:1,-2:0.1:2); surf(x,y,x.*y*1e-5) gca().cube_scaling="off"; The default combination cube_scaling="on" and isoview="off" corresponds to the default behavior in Matlab. Introducing the cube_scaling property and its default value helps "migrating users" as they obtain the same thing in both softwares. Anyway, I don't think that the combination cube_scaling="off" and isoview="off" has still an interest as it can produce the annoying behavior of the above example. The default combination cube_scaling="on" and isoview="off" allows the 3D object to fill the whole 3D box whatever the proportions of the enclosing 2D canvas, which is the expected default behavior. Antoine's remark points out that cube_scaling="on" and isoview="on" produces a plot whose proportions are completely wrong with respect of the value of isoview="on". Adding in the help page of "axes_properties/isoview " a sentence such as If you want *real* isometric scales on all axes in 3D you have to set cube_scaling property to 'off' is not admissible.Setting the value of cube_scaling to the opposite of the isoview value when the latter is changed could be a solution. At least, when the high level isoview *command* is used. S. Le 21/02/2018 à 11:06, Antoine Monmayrant a écrit : > OK, answering my own question: > > It seems that when calling surf(), the cube_scaling property of the > current axis is set to "on", which results in the observed behaviour. > Manually resetting to its default value "off", gives me the expected > behaviour. > Should I fill a bug about the absence of cube_scaling mention on the > help pages of surf() and isoview() ? > > Antoine > > Le 21/02/2018 à 10:59, Antoine Monmayrant a écrit : >> Hi all, >> >> >> I am a bit surprised by the way isoview acts on a surf plot. >> It seems to just scale the x,y,z axis so that the plot is inside an >> isometric 3D cube. >> I was expecting an aspect ratio that depends on the Z matrix value >> and size or on the X,Y coordinate vectors and the Z matrix value. >> Here is an example: >> >> //without X,Y axis: expecting an aspect ratio in the (x,y) plan >> corresponding to the dimensions of the Z matrix >> Z=rand(10,30); >> h=scf(); >> surf(Z); >> isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but >> we have square >> >> //trying with X,Y coordinates: expecting an the plot to fit inside a >> "cube" with aspect ratios along the x,y & z directions >> //that depends on max(X)-min(X), max(Y)-min(Y) & max(Z)-min(Z) >> Z=rand(10,30); >> X=1:size(Z,2); >> Y=1:size(Z,1); >> h=scf(); >> surf(X,Y,Z); >> isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but >> we have square >> >> >> Am I the only one to expect this behaviour? >> >> >> Antoine >> >> >> > -- Stéphane Mottelet Ingénieur de recherche EA 4297 Transformations Intégrées de la Matière Renouvelable Département Génie des Procédés Industriels Sorbonne Universités - Université de Technologie de Compiègne CS 60319, 60203 Compiègne cedex Tel : +33(0)344234688 http://www.utc.fr/~mottelet _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users |
Samuel GOUGEON |
In reply to this post by Antoine Monmayrant
Hi Antoine and Stéphane,
Please look at https://codereview.scilab.org/#/c/18857/ and its header, and try --> uman isoview! @ Samuel Le 21/02/2018 à 10:59, Antoine Monmayrant a écrit : > Hi all, > > > I am a bit surprised by the way isoview acts on a surf plot. > It seems to just scale the x,y,z axis so that the plot is inside an > isometric 3D cube. > I was expecting an aspect ratio that depends on the Z matrix value and > size or on the X,Y coordinate vectors and the Z matrix value. > Here is an example: > > //without X,Y axis: expecting an aspect ratio in the (x,y) plan > corresponding to the dimensions of the Z matrix > Z=rand(10,30); > h=scf(); > surf(Z); > isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but > we have square > > //trying with X,Y coordinates: expecting an the plot to fit inside a > "cube" with aspect ratios along the x,y & z directions > //that depends on max(X)-min(X), max(Y)-min(Y) & max(Z)-min(Z) > Z=rand(10,30); > X=1:size(Z,2); > Y=1:size(Z,1); > h=scf(); > surf(X,Y,Z); > isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but > we have square > > > Am I the only one to expect this behaviour? > > > Antoine > > > _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users |
Great ! But in this case I would add also
isoview('off') missed switching .cube_scaling='on' S. Le 21/02/2018 à 13:37, Samuel Gougeon a écrit : > Hi Antoine and Stéphane, > > Please look at https://codereview.scilab.org/#/c/18857/ and its header, > and try > --> uman isoview! @ > > Samuel > > Le 21/02/2018 à 10:59, Antoine Monmayrant a écrit : >> Hi all, >> >> >> I am a bit surprised by the way isoview acts on a surf plot. >> It seems to just scale the x,y,z axis so that the plot is inside an >> isometric 3D cube. >> I was expecting an aspect ratio that depends on the Z matrix value >> and size or on the X,Y coordinate vectors and the Z matrix value. >> Here is an example: >> >> //without X,Y axis: expecting an aspect ratio in the (x,y) plan >> corresponding to the dimensions of the Z matrix >> Z=rand(10,30); >> h=scf(); >> surf(Z); >> isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but >> we have square >> >> //trying with X,Y coordinates: expecting an the plot to fit inside a >> "cube" with aspect ratios along the x,y & z directions >> //that depends on max(X)-min(X), max(Y)-min(Y) & max(Z)-min(Z) >> Z=rand(10,30); >> X=1:size(Z,2); >> Y=1:size(Z,1); >> h=scf(); >> surf(X,Y,Z); >> isoview("on");//we should see a 3/1 aspect ratio in the x/Y plane but >> we have square >> >> >> Am I the only one to expect this behaviour? >> >> >> Antoine >> >> >> > > _______________________________________________ > users mailing list > [hidden email] > http://lists.scilab.org/mailman/listinfo/users -- Stéphane Mottelet Ingénieur de recherche EA 4297 Transformations Intégrées de la Matière Renouvelable Département Génie des Procédés Industriels Sorbonne Universités - Université de Technologie de Compiègne CS 60319, 60203 Compiègne cedex Tel : +33(0)344234688 http://www.utc.fr/~mottelet _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users |
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