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
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(fv,sf) uses the face
and vertex data from the struct
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
[nf,nv] = shrinkfaces(...) returns the
face and vertex data in two separate arrays instead of a struct.
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]); view(3); axis tight title('Original')
shrinkfaces to modify the face and vertex data and draw a second patch.
figure p2 = patch(shrinkfaces(fv,.3)); p2.FaceColor = 'red'; p2.EdgeColor = [0.5 0.5 0.5]; daspect([1 1 1]); view(3); axis tight title('After Shrinking')