* \param internalPoints - points dividing a grid into parts along each direction
* \param axis - index of an axis counterd from zero, i.e. 0==X, 1==Y, 2==Z
*
* \param internalPoints - points dividing a grid into parts along each direction
* \param axis - index of an axis counterd from zero, i.e. 0==X, 1==Y, 2==Z
*