[postgis-devel] [postgis-users] 3D distance functions

[Nicklas Avén]

Thanks

I will get back with a wiki-page quite soon, I hope.

One thing about the version of code posted now is that it will not
complain over inconsistent plane of a polygon. If the polygon is not in
one plane it will define a plane from some assumptions which might cause
strange behavior. I will put in a check that gives an error if the
polygon is "not enough" on one plane. But we have to have some
acceptance maybe within one millimeter or micrometer, I don't know.

Thanks
Nicklas


On Tue, 2010-12-28 at 17:42 -0500, Paragon Corporation wrote:
> Nicklas,
> 
> This sounds exciting.
> I think Oracle has 3D distance support.  We don't have Oracle installed at
> the moment, but perhaps someone with Oracle can do a test compare or we can
> reinstall later on.
> 
> We'll try to release another set of windows binaries with your new changes
> sometime later this week.
> 
> I think a wiki page would be a great idea.  Keep up the good work!
> 
> Thanks,
> Regina and Leo
> http://www.postgis.us
> 
> 
>  
> 
> -----Original Message-----
> From: postgis-devel-bounces at postgis.refractions.net
> [mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of Nicklas
> Avén
> Sent: Tuesday, December 28, 2010 5:29 PM
> To: PostGIS Development Discussion
> Subject: [postgis-devel] 3D distance functions
> 
> Hallo all
> 
> I just committed the rest of the 3D distance functions.
> There is no regression tests or unit tests yet.
> 
> There is probably a bunch of bugs, but I commit anyway and hope more people
> might punch on it.
> 
> There is a lot of possibilities to consider. The functions are supposed to
> handle holes in polygons too, so there can be one polygon passing through a
> hole of another for instance. It should work, but I have actually not tried
> it yet.
> 
> One idea I have to make a test suite is to just tilt the geometries from a
> 2D dataset with st_affine, but it will still be difficult to get answers we
> know is right. Or is there som other software that we easily can use to
> check against?
> 
> Some functions that might be of interest for other things than distance
> calculations is:
> 
> define_plane, which defines the plane of a polygon in 3D. How that is done
> might be a topic for discussion.
> 
> pt_in_ring_3d, checks is a point on the same plane as the polygon is inside
> or outside the polygon.
> 
> project_point_on_plane, gives the point from where the original point is
> perpendicular to the plane
> 
> 
> Is it a good idea to make a wiki page, describing how things works, and what
> situations I have tried to cover up? 
> 
> 
> About make astyle I couldn't run it. I had the message:
> ./astyle.sh
> Only 1.23 astyle version is 'allowed'
> 
> and I have version 1.24
> 
> 
> Regards
> Nicklas
> 
> 
> 
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