| xyz3 
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             xyz3(m3, chunk)  
 
     return vertex coordinates for CHUNK of 3D mesh M3.  The CHUNK  
     may be a list of cell indices, in which case xyz3 returns a  
     3x2x2x2x(dimsof(CHUNK)) list of vertex coordinates.  CHUNK may  
     also be a mesh-specific data structure used in the slice3  
     routine, in which case xyz3 may return a 3x(ni)x(nj)x(nk)  
     array of vertex coordinates.  For meshes which are logically  
     rectangular or consist of several rectangular patches, this  
     is up to 8 times less data, with a concomitant performance  
     advantage.  Use xyz3 when writing slicing functions or coloring  
     functions for slice3.  
interpreted function, defined at i/slice3.i   line 618  
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