MATLAB: How can i get the data from 3D graph? xyz
3dimage processingr2015a
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Easy, peasy.
Griddata will fail here. In fact, my own gridfit will produce some artifacts.
But essentially, you have a simple ribbon of the form z(y), which seems to be independent of x.
x = xyzSTL_board_ordered_dvd(:,1);y = xyzSTL_board_ordered_dvd(:,2);z = xyzSTL_board_ordered_dvd(:,3);plot(y,z,'o')
There is NO x in that relationship. So all you need to do is fit the curve z(y). Use a spline. Start out by removing any replicates. Using my consolidator tool, as found on the file exchange :
[yhat,zhat] = consolidator(y,z,@mean);plot(yhat,zhat,'-')spl = pchip(yhat,zhat);Use pchip here. This is fairly important.
[xgrid,ygrid] = ndgrid(linspace(min(x),max(x),10),linspace(min(y),max(y),100));zgrid = repmat(ppval(spl,linspace(min(y),max(y),100)),10,1);surf(xgrid,ygrid,zgrid)
Look at this example
x=1:0.1:4y=1:0.1:4[X,Y]=meshgrid(x,y)Z=sin(X).^2+cos(Y).^2surf(X,Y,Z)view(2)
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