shrinkfaces (MATLAB Functions)

Reduce the size of patch faces

Syntax

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

Description

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, MATLAB 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.

Examples

This example uses the flow data set, which represents the speed profile of a submerged jet within an infinite tank (type help flow for more information). Two isosurfaces provide a before and after view of the effects of shrinking the face size.

First reducevolume samples the flow data at every other point and then isosurface generates the faces and vertices data.
The patch command accepts the face/vertex struct and draws the first (p1) isosurface.
Use the daspect, view, and axis commands to set up the view and then add a title.
The shrinkfaces command modifies the face/vertex data and passes it directly to patch.

[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);
set(p1,'FaceColor','red','EdgeColor',[.5,.5,.5]);
daspect([1 1 1]); view(3); axis tight
title('Original')

figure
p2 = patch(shrinkfaces(fv,.3));
set(p2,'FaceColor','red','EdgeColor',[.5,.5,.5]);
daspect([1 1 1]); view(3); axis tight
title('After Shrinking')

See Also

isosurface, patch, reducevolume, daspect, view, axis

Volume Visualization for related functions

showplottool sign