get mesh from surf function

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Albi
Albi 2015-9-3
评论： Albi 2015-9-4
Is there a way to get the mesh which the function "surf" produces? By that I mean I need the usual mesh format which is a list of vertices and a list of faces.

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Mike Garrity
Mike Garrity 2015-9-4
Yes, the surf2patch command.
[x,y,z] = peaks(10);
h = surf(x,y,z);
[f,v,c] = surf2patch(h);
At this point:
  • v is a 100x3 array containing the 100 vertices
  • f is an 81x4 array containing indices into v for the 81 faces
  • c is an vector of the 100 data values which would be used for coloring the vertices

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Adam
Adam 2015-9-3
If you mean the X, Y and Z meshes that define the surface then the XData, YData and ZData properties of the surface object contain these and the CData contains the colour data for the ZData values.
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Adam
Adam 2015-9-3
I'm not too familiar with mesh definitions, but FaceNormals and VertexNormals seem to be the only other sets of data you can extract from a surface object but they are m-by-n-by-3 arrays.
Albi
Albi 2015-9-3
Yeah, I checked the properties and found nothing I could use. Looking at the surf doc page, I saw that they briefly explain the algorithm behind the surf function. I could write it myself, but it would be nice to have it for free. Looks like surf can be used only for visualization purposes.

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