A mesh function question

I am creating a mesh from a 3d volume of a brain.

I am using the iso2mesh program.

One function has this input used to create volume to mesh +v2m(img,isovalues,opt,maxvol,method)

What do isovalues, opt and maxvol mean?

What values do i put in there? I am confused. The output looks weird.

Answer 1

[Walter Roberson]

http://iso2mesh.sourceforge.net/cgi-bin/index.cgi?Doc/FunctionList

function [node,elem,face]=v2m(img,isovalues,opt,maxvol,method)
inputs and outputs are similar to those defined in vol2mesh

function [node,elem,face,regions]=vol2mesh(img,ix,iy,iz,opt,maxvol,dofix,method,isovalues)
convert a binary (or multi-valued) volume to tetrahedral mesh
input:
   img: a volumetric binary image
   ix,iy,iz: subvolume selection indices in x,y,z directions
   opt: as defined in vol2surf.m
   maxvol: target maximum tetrahedral elem volume
              when method='cgalmesh', maxvol can specify the target
              for each label (subregion index) by the following syntax
              'label1=size1:label2=size2:...'
   dofix: 1: perform mesh validation&repair, 0: skip repairing
   method: 'cgalsurf' or omit: use CGAL surface mesher
     'simplify': use binsurface and then simplify
     'cgalmesh': use CGAL 3.5 3D mesher for direct mesh generation [new]
     generally speaking, 'cgalmesh' is the most robust path
     if you want to product meshes from binary or multi-region
     volumes, however, its limitations include 1) only accept 
     uint8 volume, and 2) can not extract meshes from gray-scale
     volumes. If ones goal is to process a gray-scale volume,
     he/she should use the 'cgalsurf' option. 'simplify' approach
     is not recommended unless other options has failed.
   isovalues: a list of isovalues where the levelset is defined