[PostGIS] #4560: ST_3DInterpolatePoint

[PostGIS]

#4560: ST_3DInterpolatePoint
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.7.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by robe):

 Replying to [comment:2 pramsey]:
 > So project the point in 3D and read off the M?
 >
 > {{{
 > SELECT ST_InterpolatePoint('LINESTRING ZM (0 0 0 0, 10 0 10 20)', 'POINT
 Z (5 5 5)');
 > }}}

 I'm not sure how that would work since M is changing along the line.
 Which M am I reading off.  Some value between 0 and 20.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4560#comment:3>
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