Extract surface from matlab .fig

Question

I have a matlab .fig file which contains some points and a surface fitted to them. I want to extract the surface from the figure, and I would like to have both the vertices and the faces. Could you please provide me some hints on how to achieve this?

My figure can be found here: https://drive.google.com/file/d/0By376R0mxORYU3JsRWw1WjllWHc/view?usp=sharing and I would like to extract the surface without the blue points.

EDIT: it is not a duplicate, see my comment below as to why.

Possible duplicate of How can I extract data from a .fig file in MATLAB? — excaza
@excaza it is not a duplicate, because what I didn't know was how to separate the surface from the points, which was not even implied in that question. — pixie
Yes it is a duplicate, Yair's answer is the same as what you accepted. — excaza

il_raffa il_raffa · Accepted Answer · 2016-05-19T18:28:20

The data used to plot either the surface and the dots are stored in the figure.

Therefore you can:

open the figure
get the data from the figure
get the children of the figure, in thsi case the axes
extract form the axes, the X, y, and z data of the surface

The axes actually contains two set of data:

the data of the dots stored in the z(1) XData, YData, ZData
the data of the surface stored in the z(2) XData, YData, ZData

This is the code (with "dot notation"):

% Open the figure
open('cubicinterp.fig')
% Get the data from the figure
x=gcf
% Get the children of the figure (in this case the axes)
y=x.Children
% Get the data used to plot on the axes
z=y.Children

figure
XX=z(2).XData;
YY=z(2).YData;
ZZ=z(2).ZData;
CCDD=z(2).CData;
surf(XX,YY,ZZ,CCDD)
return

This is the code without the "dot notation" (before R2014b)

% Open the figure
open('cubicinterp.fig')
% Get the data from the figure
x=gcf
% Get the children of the figure (in this case the axes)
y_1=get(gcf,'children');
% Get the data used to plot on the axes
z_1=get(y_1,'children');

figure
XX=get(z_1(2),'xdata');
YY=get(z_1(2),'ydata');
ZZ=get(z_1(2),'zdata');
CCDD=get(z_1(2),'Cdata');
surf(XX,YY,ZZ,CCDD)

This is the extracted surface:

Hope this helps.

Qapla'

Extract surface from matlab .fig

1 Answers