I am using QGIS 3.0 and loaded a polygon layer from a shapefile containing more than 300,000 polygons. When zooming in some polygons are not drawn (not the entire layer). enter image description here

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  • I have tested QGIS 3.2, the same problem occurs. – MyGIS Sep 7 '18 at 9:56
  • That could be cause to invalid geometry, did you check that ? – J.R Sep 7 '18 at 10:06
  • @J.R , how can I check that out? – MyGIS Sep 7 '18 at 10:18
  • There is a "Check validity" tool in processing – J.R Sep 7 '18 at 10:23
  • @J.R Could you please convert your comment to an Answer as you suggestion solved my problem. – MyGIS Sep 17 '18 at 5:28

This could be caused by geometry errors.

QGIS Processing Toolbox offers two tools which help to diagnose and fix geometry errors:

  • Use the Check validity tool to process data into valid, invalid, and erroneous geometry.

  • Use the Fix geometries tool to repair erroneous geometry.

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