I want to export iso views to dwg. How to delete back edges??
section plane cut → export → 2D → save DWG
Your image doesn’t show an iso.
Do you wish to export a slice of the shown object or the section cut, section lines in the section plane only?
Thank you for you reply.The problem has been solution. turn off hardware acceleration. 
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You should also try updating your graphics card driver and turning hardware acceleration back on.
Anssi