3D measuring functions doesn't recognize identical vertex points correctly

[nicklas]

As per email from Alexandre Neto ​https://lists.osgeo.org/pipermail/postgis-users/2020-November/044563.html

2 geometries sharing one vertex point gives false as result in intersects test

[nicklas]

The problem is that the shared vertex is not identified but calculated which gives floating point error.

[nicklas]

Should be fixed with ​https://gitlab.com/postgis/postgis/-/merge_requests/16

please someone take a look and merge

[Raúl Marín <git@…>]

In dfeaaac/git:

Fix ST_3dintersects calculations with identical vertices

Short circuit when geometries share points to avoid unnecessary
calculations that can lead to floating point errors

Closes ​https://gitlab.com/postgis/postgis/-/merge_requests/16
References #4790 (master)

[Raúl Marín <git@…>]

In 5566fb7/git:

Fix ST_3dintersects calculations with identical vertices

Short circuit when geometries share points to avoid unnecessary
calculations that can lead to floating point errors

References #4790 (3.0)

[Algunenano]

Fixed applied in 3.1 (master) and 3.0. Not backported to 2.5 or previous releases.

[pramsey]

I've looked at the 2.5 port and I'm closing out as it's too unfun.