[postgis-tickets] [PostGIS] #4278: ST_3DIntersects / ST_3DDistance solid aware in LWGEOM

[PostGIS]

#4278: ST_3DIntersects / ST_3DDistance solid aware in LWGEOM
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  Reporter:  komzpa   |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.0.0
 Component:  postgis  |    Version:  2.4.x
Resolution:           |   Keywords:
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Comment (by komzpa):

 Ray from point to infinity can be expressed as a box (Xmin=X[-eps],
 Xmax=X[+eps], Ymin=Y[-eps], Ymax=Y[+eps], Zmin=Z, Zmax = infinity). You
 can intersect such box with any dimension geometry by feeding the ranges
 into lwgeom_clip_to_ordinate_range.

 Afterwards you get a bunch of super tiny polygons with 2D area=0, area =
 eps^2. Count ones with area>0, that will get you a good approximation of
 number of hits. If you find a hit with area of 0 < area < eps^2, it's on
 the edge, mark it with a TODO:FIXME and emit a warning.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4278#comment:3>
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