How can I do? If Z coordinate of certain lines is not 0 which will lead to abnormality of chamfer and trim?
You can change Z coordinate in Express Pop-menu in GStarICAD 2007. You can select all objects, change the Z coordinate to unitive value, such as 0. It is better to find out the reason why the Z coordinate is not 0 to avoid the same situation again. If you are not sure, you can send the drawings to support@GStarsoft.com, our developers will analyze, then find out the reason and modify.