MATLAB Function Reference

shrinkfaces

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 a 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

shiftdim

sign