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https://issues.apache.org/jira/browse/LUCENE-8220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ignacio Vera updated LUCENE-8220:
---------------------------------
Description:
The attached patch contains two polygons that still shows problems with
co-planar points. To better explain the issue I attached some images:
1) concave.jpg: This is the polygon we want to build. Note that we want to
build the concave part, therefore the blue part is actually not part of the
shape and the white part is the area cover by the shape.
2) concaveWithTiling.jpg: The algorithm of the polygon factory tries to tile
the polygon using convex polygons. In our case it creates the three colored
polygons on the image. What it remains is a concave polygon.
The problem with this polygon is that the right edge of the concave polygon
contains co-planar points. These points cannot be merged into a single plane
because they have different properties (internal edges or shape edges).
Because GeoConvexPolygon and GeoConcavePolygon cannot handle polygons with
co-planar points, the polygon cannot be built.
[[email protected]], Is it possible to make this polygons support such an
extreme case?
was:
The attached patch contains two polygons that still shows problems with
co-planarity points. To better explain the issue I attached some images:
1) concave.jpg: This is the polygon we want to build. Note that we want to
build the concave part, therefore the blue part id actually not part of the
shape and the white part is the are cover by the shape.
2) concaveWithTiling.jpg: The algorithm of the polygon factory tries to tile
the polygon using convex polygons. In our case it creates the three coloured
polygons on the image. What it remains is a concave polygon.
The problem with this polygon is that the right edge of the concave polygon
contains co-planar points. These points cannot be merged into a single plane
because they have different properties (internal edges or shape edges).
Because GeoConvexPolygon and GeoConcavePolygon cannot hadle polygons with
coplanar points, the polygon cannot be built.
[[email protected]], Is it possible to make this polygons support such an
extreme case?
> GeoPolygon factory still shows problems with coplanar points
> ------------------------------------------------------------
>
> Key: LUCENE-8220
> URL: https://issues.apache.org/jira/browse/LUCENE-8220
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Assignee: Karl Wright
> Priority: Major
> Attachments: concave.jpg, concaveWithTiling.jpg,
> coplanarity-test.patch
>
>
> The attached patch contains two polygons that still shows problems with
> co-planar points. To better explain the issue I attached some images:
> 1) concave.jpg: This is the polygon we want to build. Note that we want to
> build the concave part, therefore the blue part is actually not part of the
> shape and the white part is the area cover by the shape.
> 2) concaveWithTiling.jpg: The algorithm of the polygon factory tries to tile
> the polygon using convex polygons. In our case it creates the three colored
> polygons on the image. What it remains is a concave polygon.
> The problem with this polygon is that the right edge of the concave polygon
> contains co-planar points. These points cannot be merged into a single plane
> because they have different properties (internal edges or shape edges).
> Because GeoConvexPolygon and GeoConcavePolygon cannot handle polygons with
> co-planar points, the polygon cannot be built.
> [[email protected]], Is it possible to make this polygons support such
> an extreme case?
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