Export a Matlab surface to an Avizo© (VSG) compatible surface

Export a single surface defined by vertices and triangular faces to an Avizo compatible surface

Usage:
writeAvizoSurf(f,v,filename,colourTissue,colourExterior);
writeAvizoSurf(f,v,filename,colourTissue);
writeAvizoSurf(f,v,filename);
writeAvizoSurf(f,v);

Parameters:
f - triangular faces, n by 3
v - list of vertices, n by 3
filename - the filename for exported surface
- Default value: ExportedEllipsoid.surf
colourTissue - the colour of the surface, e.g. [1 0 0] for red
- Default value: [1 0.8 0.4];
colourExterior - the colour of the background
- Default value: [0.8 0.8 0.8];
Example:
[x, y, z] = ellipsoid(0,0,0,3,4,5,30);
[f,v,~] = surf2patch(x,y,z,z,'triangles');
writeAvizoSurf(f,v,'ExportedEllipsoid.surf',[1 0 0], [0.8 0.8 0.8]);

Author: Sheng Yue
Email: [e-mail]
Created: 24 November 2011
Version: 1.0