Dear all,
in order to let you know how this matter is evolving...
Dear Jacek,
thanks for the useful info about unit standard in the USA.
I imported your DXF file following these rules:
1. imported the DXF file using 12'' as DXF unit (filter=0)
2. selected only the layer named 11 (that contains the contour lines) by importing only the polylines points (in this case we don't need the constraint coming from this contour lines because the distance between two successive nodes is very short) 3. ArchiTerra reads the DXF files and show you how many nodes the import procedure read: in this case the conversion of your DXF file generates 44553 points (too much!!!) 4. defined a proper filter (as ArchiTerra suggests) by successive tries till I realized that a good filter should be 6 meter. 6 meter as filter could sound as a too large approximation but, once again, we are not handling a building or a architectural object but a big terrain where this length isn't so big! 5. using the 6 meter filter I reduced the 44553 points to only 7098 points (not bad!)
The time needed to do all this is about 5 minutes...
As you can see in the attached picture, the terrain looks very similar to that one you generated before but it doesn't slow down ArchiCAD before isn't heavy as before! Probably we could increase the filter again but this is a decision that only you can consider...
BTW, the number of points isn't a trouble for ArchiTerra (maybe you have to wait more time for each elaboration but, on the other hand, ArchiTerra has no limit in the size of the terrain data) but for ArchiCAD so...
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy