Exporting .DWG files from the Corel Draw environment brings a few difficulties – besides other getting splines from “normal lines” automatically.
Although I always wonder why the hell people tend to use unappropriate tools for the terrain drafting (and I am not speaking about some marginal projects – imagine the National Museum of Czech Republic use Corel DTP craps for terrain vectorisation purposes) the thing is that sometimes I need to process .CDR files into archaeological terrain documentation. OK, exporting into .DWG is not “teeth pulling” by no means and the loss of coordinate system, texts, hatches and half a milion of other features does not mean I would feel unhappy but there is one particular thing I really hate – all the lines are automatically convertd into SPLINES (or “Bezier’s” if You prefer). I can’t use them for any reasonable work (mostly as a geometries leading to surface generation and so on).
Sure there is straightforward possibility to convert them into POLYLINES (SPLINEDIT > CONVERT TO POLYLINE) in Autodesk environment directly but resulting line has one unwanted defect – to many line vertices defining the polyline geometry. I allways gave up to this and use these unnecessarily complicated geometries for my purposes until I found the weeding-out command.
The magic word is WEEDFEATURES and accompanying dialog box allows You to customize the precision and “power” of weeding. The only imperfection, however, is the selecting only one feature but I would write a short LISP script to automate this task.