The above code is correct. Tethex works fine if the values in your 
"iso.msh" are of type double. My used data is of type <usigned char> and so 
I converted them in <double> using the following code:     

   double d = (double) data[pos];    //data[pos] is of type unsigned char&

This lead to the error-prone behavior. It works, after I changed this to 

   double d = static_cast <double> (data[position]);

Best regards,
Felix

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