Neue funktion Calculate_boundary hinzugefügt, welche einen Marker übernimmt. so kann angegeben werden, für welchen rand die LSM berechnet werden soll.

added the direct interpolator class. Now it is possible to interpolate in the unstructured grid directly, without crating an intermediate mesh. slow for random access, but for structures access (as in ray tracing for example) similar to the intermediate method. Benefit: more accurate!

face transform now working FINE ! Implementation is not perfect though, but since this is only called once, shouldn't make a big difference in performoance.