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I am using the QGIS (2.8.1) Voronoi Polygons Algorithm on a point shapefile. See image below, the red triangles are the points I am using. The resulting polygons miss a part (around HP87).

Any ideas why?

Resulting voronoi polygons

Here is some example data (EPSG:2154) that reproduces the error (excluding point A):

X,Y,NAME
816682.58,6391443.637,A
820180.458,6391708.558,B
821325.8429,6394449.982,C
822550.1316,6397547.124,D
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    I see this weird phenomena in QGIS 2.18.16, with QGIS geoalgorithm and v.voronoi. (Potentially related to an unanswered question ). They seem to ignore outmost point. SAGA Thiessen polygons is unaffected... – Kazuhito Feb 20 '18 at 16:23
  • Can you provide a sample data? – Alexandre Neto Feb 20 '18 at 16:58
  • @AlexandreNeto A sample data was added. Will you give it a go? (I am testing it with various buffer region. It behaves strange when the buffer exceeds approx. 9 ~10.) – Kazuhito Feb 22 '18 at 14:47
  • There were several bugs in the QGIS Voronoi code. Should be fixed in QGIS 3.2.2. Could you try it? – Håvard Tveite Aug 25 '18 at 19:29

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