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Reduce size of patch faces


nfv = shrinkfaces(p,sf)
nfv = shrinkfaces(fv,sf)
nfv = shrinkfaces(f,v,sf)
[nf,nv] = shrinkfaces(...)


shrinkfaces(p,sf) shrinks the area of the faces in patch p to shrink factor sf. A shrink factor of 0.6 shrinks each face to 60% of its original area. If the patch contains shared vertices, the MATLAB® software creates nonshared vertices before performing the face-area reduction.

nfv = shrinkfaces(p,sf) returns the face and vertex data in the struct nfv, but does not set the Faces and Vertices properties of patch p.

nfv = shrinkfaces(fv,sf) uses the face and vertex data from the struct fv.

shrinkfaces(p) and shrinkfaces(fv) (without specifying a shrink factor) assume a shrink factor of 0.3.

nfv = shrinkfaces(f,v,sf) uses the face and vertex data from the arrays f and v.

[nf,nv] = shrinkfaces(...) returns the face and vertex data in two separate arrays instead of a struct.


collapse all

Load the flow data set, which represents the speed profile of a submerged jet within an infinite tank. Create two isosurfaces that provide a before and after view of the effects of shrinking the face size.

Sample the flow data at every other point using reducevolume and then use isosurface to generate the faces and vertices data. Draw the first isosurface. Then set up the view and add a title.

[x,y,z,v] = flow;
[x,y,z,v] = reducevolume(x,y,z,v,2);
fv = isosurface(x,y,z,v,-3);
p1 = patch(fv);
p1.FaceColor = 'red';
p1.EdgeColor = [0.5 0.5 0.5];
daspect([1 1 1]); 
axis tight

Use shrinkfaces to modify the face and vertex data and draw a second patch.

p2 = patch(shrinkfaces(fv,.3));
p2.FaceColor = 'red';
p2.EdgeColor = [0.5 0.5 0.5];
daspect([1 1 1]); 
axis tight
title('After Shrinking')

Introduced before R2006a

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