﻿ Distance3D Method (GeometryEngine)—ArcGIS Pro
ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Geometry Namespace / GeometryEngine Class / Distance3D Method
The first geometry.
The second geometry.
Example

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Distance3D Method (GeometryEngine)
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Measures the 3-dimensional planar distance between two geometries.
Syntax
```public double Distance3D(
Geometry geometry1,
Geometry geometry2
)```
```Public Function Distance3D( _
ByVal geometry1 As Geometry, _
ByVal geometry2 As Geometry _
) As Double```

Parameters

geometry1
The first geometry.
geometry2
The second geometry.

Return Value

The distance between the two input geometries in the same unit as the spatial reference of the input geometries. If either of the input geometries is empty, then NaN is returned.
Exceptions
ExceptionDescription
Either geometry1 or geometry2 or both are null.
The method is not implemented for GeometryBag.
Incompatible spatial references between the input geometries.
Either geometry1 or geometry2 is not Z-Aware.
Remarks
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, not the nearest points.
Example
Determine 3D distance between two Geometries
```// between points
MapPoint pt1 = MapPointBuilderEx.CreateMapPoint(1, 1, 1);
MapPoint pt2 = MapPointBuilderEx.CreateMapPoint(2, 2, 2);
MapPoint pt3 = MapPointBuilderEx.CreateMapPoint(10, 2, 1);

// pt1 to pt2
double d = GeometryEngine.Instance.Distance3D(pt1, pt2);        // d = Math.Sqrt(3)

// pt1 to pt3
d = GeometryEngine.Instance.Distance3D(pt1, pt3);        // d = Math.Sqrt(82)

// pt2 to pt3
d = GeometryEngine.Instance.Distance3D(pt2, pt3);        // d = Math.Sqrt(65)

// intersecting lines

List<MapPoint> list = new List<MapPoint>();

Polyline line1 = PolylineBuilderEx.CreatePolyline(list);

List<MapPoint> list2 = new List<MapPoint>();

Polyline line2 = PolylineBuilderEx.CreatePolyline(list2);

bool intersects = GeometryEngine.Instance.Intersects(line1, line2);    // intersects = true
d = GeometryEngine.Instance.Distance3D(line1, line2);                  // d = 0   (distance is 0 when geomtries intersect)
```
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.