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How to put the direction vector on the selected surface in the secondary development of ug

Click the Points dialog box. In the secondary development of ug, you need to click the "Point Dialog Box" to put the direction vector on the selected surface. UG is a commercial CAD software, which now belongs to Siemens. From the version of 18, the secondary development function is provided, that is, it supports programming to expand the system function to meet the special needs of users.