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The conventional suffix for a MESH file is .mesh.
   
The file syntax is
     [U][C][N][Z][4][u][v][n]MESH # Key word
     [Ndim]                 # Space dimension, present only if nMESH
     Nu Nv            # Mesh grid dimensions
                                  # Nu*Nv vertices, in format specified
                                  # by initial key word
     vertex(u=0,v=0)  vertex(1,0)  ... vertex(Nu-1,0)
     vertex(0,1) ...    vertex(Nu-1,1)
     ...
     vertex(0,Nv-1) ... vertex(Nu-1,Nv-1)
   The key word is  [U][C][N][Z][4][u][v][n]MESH. 
The optional prefix characters mean:
     
S and T texture
parameters for that vertex; the third should be specified as zero. 
Z and
4 cannot both be present. 
Note that the order of prefix characters is significant; a colored,
u-wrapped mesh is a CuMESH not a uCMESH.
   
Following the mesh header are integers Nu and Nv, the dimensions of the mesh.
Then follow Nu*Nv vertices, each in the form given by the header. They appear in v-major order, i.e. if we name each vertex by (u,v) then the vertices appear in the order
     (0,0) (1,0) (2,0) (3,0) ...  (Nu-1,0)
     (0,1) (1,1) (2,1) (3,1) ...  (Nu-1,1)
     ...
     (0,Nv-1)		...  (Nu-1,Nv-1)
   A MESH BINARY format is accepted; See Binary format.  The
values of Nu and Nv are 32-bit integers; all other values
are 32-bit floats.