function getTranslationFactor(max, min) {
    return -(min + (max - min) / 2);
}
Determines translation amount for a given axis to normalize model coordinates.

@method
@private

@param {Number} max Maximum position value of given axis on the model.
@param {Number} min Minimum position value of given axis on the model.

@return {Number} Number by which the given axis should be translated for all vertices.