How to extract data from a 3d implicit plot?

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Amir
Amir 2012-6-30
Hi,
I would like to extract data from 3d implicit plot. My plot:
[Y,X,Z] = ndgrid(linspace(-2,2,30),linspace(-2,2,30),linspace(-2,2,30));
V = ((X.^2).*(1-X.^2)-Y.^2).^2+0.5*Z.^2-0.025*(1+1.0*(X.^2+Y.^2+Z.^2));
p = patch(isosurface(X,Y,Z,V,0));
isonormals(X,Y,Z,V,p);
set(p,'FaceColor','b','EdgeColor','k','FaceAlpha',0.1,'EdgeColor','none');
daspect([1 1 1])
axis square;
How can I get the coordinates of the points on the surface?
Thanks.

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per isakson
per isakson 2012-7-1
编辑：per isakson 2012-7-1
Matlab has a tool called "Data Cursor". It has a icon in the Tool bar of the Figure window. With that you can "extract" data from the diagram. Select a point, right click, choose Export Cursor Data ...
Is that what you mean?
--- Cont. ---
The surface is represented by a patch with the handle, p.
"points on the surface" is a bit vague.
get(p) returns a list of properties of the patch. Those of interest to you are
...
Vertices = [ (584 by 3) double array]
XData = [ (3 by 1172) double array]
YData = [ (3 by 1172) double array]
ZData = [ (3 by 1172) double array]
...
The vertices are "points on the surface".
  1 个评论
Amir
Amir 2012-7-1
Thanks, but I would like to export all the points of the surface on the grid. If I work with a 100x100x100 grid it's impossible to get the points with 'Data Cursor'.

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