【转帖】problem understanding extrusion direction
 

problem understanding extrusion direction
problem understanding extrusion direction
hi. in the attached dxf file the rectangle (starting in 0,0) is mirrored around the y axis. seen in the entities section as line with the following attributes:
210
0.0
220
0.0
230
-1.0
it has 3 holes - not mirrored.
autocad and solid edge 2d draws it as a rectangle with 3 holes inside. our application that reads the dxf file and converts the entities to our internal format, does show it as a rectangle with holes outside the recangle as the recatangle is mirrored.
can anyone give me a hint, i think there is someting about the coordinate system and dxf i do not understand.
best regards laurs
ps! if you don't se the file i can send a link to it
attached files
unlike polyline line entities store their start and end points in world coordinate system (wcs) so you need not apply transformation defined by normal to them.
sergey slezkin