I have created a vector which is a connection to Sql Server. I then select Vector > Geometry Tools > Voronoi Polygons. I select my input layer and a temporary file for my Voronoi polygons. I get the float division by zero error and the file is empty that is supposed to be created. I am new to QGIS and am baffled as to what I am doing wrong. I have used the Check Validity menu item and the geometry in the input layer is valid. Also where do I get to select the grouping for my input data for the polygons generated ?. Any ideas anyone?

I should add that I get the same error for Delaunay triangulation algorithm. There is something I am missing but I an unaware of what it is.


Not sure what version of QGIS you're using, but if it's 2.18 there appears to be a known issue which is fairly recent.

It happens when no polygons are created, so the fixed version will just give you a different, more informative error message.

You should check you're doing this on a points layer. I managed to get the same if I load in a shapefile of type polygon. Normally the dialog only allows you to select point layers, but allows you to open other files using the ... button.

  • Yeah I am using 2.18 but I am about to change to an earlier version. I do need a more informative error message. – Darren Wood Dec 21 '16 at 20:12
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    is it a points layer? if not, i suspect reverting to an older version won't help. If it is a points layer, something else might be the problem. – Steven Kay Dec 21 '16 at 20:20
  • It is a points layer – Darren Wood Dec 21 '16 at 20:26
  • It is failing as well. Slightly different in that it just hangs and never creates the result. I can not see where the error is defined though. – Darren Wood Dec 21 '16 at 20:52
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    The reason it was failing is because it was a multipoint event though it was only 1 point. I forgot I had to change this when I was extracting it elsewhere. So it works now thanks for your help. – Darren Wood Dec 21 '16 at 22:41

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