ArcObjects Library Reference (Geometry)  

IConstructMultiPatch.ConstructExtrudeAbsolute Method

Construct a MultiPatch by extruding a (non-point) geometry using its initial Zs for one base, and a uniform input Z for the other.

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

Parameters

toZ 
  toZ 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 from the base geometry to a given absolute Z plane.  The base Z value of the geometry is preserved and top Z value is uniformly equal to the input absolute Z.  The resulting extrusion is always parallel to the XY-plane on the top and only parallel at the base 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 ExtrudeAbsolute 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 ToZ = -10;

 

            //Extrusion: 3D Polyline Having Vertices With Varying Z Values, Extruded To Specified Z Value

            //           Via ConstructExtrudeAbsolute()

 

            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.ConstructExtrudeAbsolute(ToZ, polylineGeometry);

 

            return constructMultiPatch as IGeometry;

        }

 

        public 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