Using the iso_csg.inc  I was experimenting with the following.
Basically I wanted to substitute iso_csg triangles for mesh elements
which in this case I am getting from arrays ( Verts Faces ). I was 
getting what appeared to be memory errors.  That lead to the following 
script which is an attempt to bite off and process subsets of the mesh 
elements.  The error I am getting is on the attempt to load the array, 
IsoMeshArray, on the second pass.  The message is that I cannot redefine 
a function definition; that I must #undef it first.  But the #undef 
instructions are being exercised.  If, after you get done laughing, 
anyone could point to the problem, it would be very much appreciated.
Thanks, Jim

#declare IsoMeshArray = array [ 16 ];
#local i=0;
#declare indx=0;
#while(i<Totalfaces)
   #if (mod(i,16)=0)
     #if ( i )
        #declare fn_mesh [indx] = IC_Merge_Array ( IsoMeshArray )
        #local j=0;
        #while(j<dimension_size(IsoMeshArray,1))
          #undef IsoMeshArray[j]
          #local j=j+1;
        #end
        #undef IsoMeshArray
        #declare IsoMeshArray = array [ 16 ];
        #declare indx=indx+1;
     #end
   #end

   #if ( indx > 0 )
     #declare IsoMeshArray [i/(indx+1)] =
     IC_Triangle( Verts[Faces[i].x],
                  Verts[Faces[i].y],
                  Verts[Faces[i].z], 0.1);
   #else
     #declare IsoMeshArray [i] =
     IC_Triangle( Verts[Faces[i].x],
		 Verts[Faces[i].y],
		 Verts[Faces[i].z], 0.1);
   #end
   #local i=i+1;
#end

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