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after doing proboolean on extruded square and lines (sweep command used on lines to make it solid form to subracct it from box) i get black lines and after rendering it into scenes i get reflections on that subtracted surfaces. please help.
Hard to tell from just the screenshots but my first guess would be that the smoothing groups are not assigned correctly due to the way the object was created. I would try selecting all the polygons and then clicking on "Auto Smooth"
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