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public interface IProximityOperator3D
Provides access to members that find the 3D distance between two geometries with Zs.
This interface is new at ArcGIS 9.3.
Returns the point on the input geometry that is closest to the input point, and returns the 3D distance between these two points. In contrast to IProximityOperator, Z values are taken into account when determining whether the given relationship exists.
These methods are intended to be called against toplevel
geometries only (Point, Multipoint, Polyline, Polygon, Envelope,
MultiPatch). To call a method against a Segment/Path or Ring, first
add the part to a Polyline or Polygon container, respectively, and
then call the appropriate method against the container.
These methods treat MultiPatch geometries as shell representations,
where the interior is not considered part of the geometry.
Consequently, a point situated inside a MultiPatch that does not
touch one of its surfaces will be classified as disjoint from that
MultiPatch.
Method Summary  

void 
queryNearestPoint3D(IPoint pInP,
int extension,
IPoint pNearest)
Copies into 'nearest' a point on this geometry nearest to the input point. 
double 
returnDistance3D(IGeometry pOther)
Returns the minimal distance between two geometries. 
IPoint 
returnNearestPoint3D(IPoint pInP,
int extension)
Creates and returns a point on this geometry nearest to the input point. 
Method Detail 

void queryNearestPoint3D(IPoint pInP, int extension, IPoint pNearest) throws IOException, AutomationException
Queries the nearest point on a z aware geometry to the input
point in 3D space. Depending on the method of segment
extension, the nearest point can also be found on an extension of
the geometry.
If the geometry is an Envelope and the input point is located within the bounds of the Envelope, QueryNearestPoint3D will return a point on the exterior of the Envelope nearest the input point.
pInP
 A reference to a com.esri.arcgis.geometry.IPoint (in)extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)pNearest
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint returnNearestPoint3D(IPoint pInP, int extension) throws IOException, AutomationException
Finds and returns the nearest point, in 3D space, on a z aware
geometry to the input point. Depending on the method of
segment extension, the nearest point can also be found on an
extension of the geometry.
If the geometry is an Envelope and the input point is located within the bounds of the Envelope, QueryNearestPoint3D will return a point on the exterior of the Envelope nearest the input point.
pInP
 A reference to a com.esri.arcgis.geometry.IPoint (in)extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.double returnDistance3D(IGeometry pOther) throws IOException, AutomationException
Returns the minimum distance between two z aware geometries in
3D space. If the geometries intersect, the minimum distance
is 0. Only returns the distance, and not the nearest
points.
pOther
 A reference to a com.esri.arcgis.geometry.IGeometry (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.


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