ArcObjects Library Reference (Geometry)  

IConstructMultiPatch.ConstructExtrude Method

Construct a MultiPatch by using an input (non-point) geometry as one base and offsetting the Zs already set on the input geometry to get the second base.

[Visual Basic .NET]
Public Sub ConstructExtrude ( _
    ByVal OffsetZ As Double, _
    ByVal baseGeom As IGeometry _
)
[C#]
public void ConstructExtrude (
    double OffsetZ,
    IGeometry baseGeom
);
[C++]
HRESULT ConstructExtrude(
  double OffsetZ,
  IGeometry* baseGeom
);
[C++]

Parameters

OffsetZ 
  OffsetZ is a parameter of type double
baseGeom 

  baseGeom is a parameter of type IGeometry

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Description

Creates a MultiPatch from a base non-point geometry by extruding the base geometry along the Z-axis by a given offset factor.  The base Z value of the geometry is preserved and top Z value is calculated as an offset of each point in the input geometry.  The resulting extrusion is parallel to the XY-plane only if the base geometry is parallel to the XY-plane.

Remarks

All non-linear segments are treated as linear segments when extrusion is performed.  Only Polylines, Polygons, and Envelopes are allowed as input geometries.

ConstructMultiPatch Extrude Example

[C#]

        private static object _missing = Type.Missing;

        public static IGeometry GetMultiPatchGeometry()

        {

            const int DensificationDivisions = 20;

            const double MaxDeviation = 0.1;

            const double BaseZ = 0;

            const double OffsetZ = -7;

 

            //Extrusion: 3D Polyline Having Vertices With Varying Z Values, Extruded Relative To Existing

            //           Vertex Z Values Via ConstructExtrude()

 

            IPointCollection polylinePointCollection = new PolylineClass();

 

            polylinePointCollection.AddPoint(ConstructPoint2D(-10, -10), ref _missing, ref _missing);

            polylinePointCollection.AddPoint(ConstructPoint2D(0, -5), ref _missing, ref _missing);

            polylinePointCollection.AddPoint(ConstructPoint2D(0, 5), ref _missing, ref _missing);

            polylinePointCollection.AddPoint(ConstructPoint2D(10, 10), ref _missing, ref _missing);

 

            IPolyline polyline = polylinePointCollection as IPolyline;

            polyline.Densify(polyline.Length / DensificationDivisions, MaxDeviation);

 

            IGeometry polylineGeometry = polyline as IGeometry;

 

            MakeZAware(polylineGeometry);

 

            Random random = new Random();

 

            for (int i = 0; i < polylinePointCollection.PointCount; i++)

            {

                IPoint polylinePoint = polylinePointCollection.get_Point(i);

 

                polylinePointCollection.UpdatePoint(i, ConstructPoint3D(polylinePoint.X, polylinePoint.Y, BaseZ - 2 * Math.Sin(random.NextDouble())));

            }

 

            ITopologicalOperator topologicalOperator = polylineGeometry as ITopologicalOperator;

            topologicalOperator.Simplify();

 

            IConstructMultiPatch constructMultiPatch = new MultiPatchClass();

            constructMultiPatch.ConstructExtrude(OffsetZ, polylineGeometry);

 

            return constructMultiPatch as IGeometry;

        }

 


        private static IVector3D ConstructVector3D(double xComponent, double yComponent, double zComponent)

        {

            IVector3D vector3D = new Vector3DClass();

            vector3D.SetComponents(xComponent, yComponent, zComponent);

 

            return vector3D;

        }

 

        private static double GetRadians(double decimalDegrees)

        {

            return decimalDegrees * (Math.PI / 180);

        }

 

        private static IPoint ConstructPoint3D(double x, double y, double z)

        {

            IPoint point = ConstructPoint2D(x, y);

            point.Z = z;

 

            return point;

        }

 

        private static IPoint ConstructPoint2D(double x, double y)

        {

            IPoint point = new PointClass();

            point.PutCoords(x, y);
 

            return point;

        }

 

        private static void MakeZAware(IGeometry geometry)

        {

            IZAware zAware = geometry as IZAware;

            zAware.ZAware = true;

        }

See Also

IConstructMultiPatch Interface | IExtrude.ExtrudeBetween Method | IExtrude.ExtrudeAbsolute Method | IConstructMultiPatch.ConstructExtrudeAlongLine Method | IConstructMultiPatch.ConstructExtrudeRelative Method | IConstructMultiPatch.ConstructExtrude Method | IExtrude.ExtrudeFromTo Method | IExtrude.ExtrudeRelative Method | IConstructMultiPatch.ConstructExtrudeFromTo Method | IConstructMultiPatch.ConstructExtrudeAbsolute Method | IExtrude.Extrude Method | IConstructMultiPatch Interface | IExtrude Interface | IConstructMultiPatch.ConstructExtrudeBetween Method | IExtrude.ExtrudeAlongLine Method | IGlobeHeightProperties.ExtrusionExpressionString Property