ArcObjects Library Reference (Geometry)

IConstructMultiPatch.ConstructExtrudeRelative Method

[Visual Basic .NET]
Public Sub ConstructExtrudeRelative ( _
    ByVal extrusionVector As IVector3D, _
    ByVal baseGeom As IGeometry _
)

[C#]
public void ConstructExtrudeRelative (
    IVector3D extrusionVector,
    IGeometry baseGeom
);

[C++]
HRESULT ConstructExtrudeRelative(
  IVector3D* extrusionVector,
  IGeometry* baseGeom
);

[C++]
Parameters
extrusionVector 
  extrusionVector is a parameter of type IVector3D
baseGeom 
  baseGeom is a parameter of type IGeometry

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

[C#]

        private static object _missing = Type.Missing;

        public static IGeometry GetMultiPatchGeometry()

        {

            const double CircleDegrees = 360.0;

            const int CircleDivisions = 36;

            const double VectorComponentOffset = 0.0000001;

            const double CircleRadius = 3.0;

            const double BaseZ = 0.0;

            const double RotationAngleInDegrees = 89.9;

 

            //Extrusion: 3D Circle Polygon Extruded Along 3D Vector Via ConstructExtrudeRelative()

 

            IPointCollection pathPointCollection = new PathClass();

 

            IGeometry pathGeometry = pathPointCollection as IGeometry;

 

            MakeZAware(pathGeometry);

 

            IPoint originPoint = ConstructPoint3D(0, 0, 0);

 

            IVector3D upperAxisVector3D = ConstructVector3D(0, 0, 10);

 

            IVector3D lowerAxisVector3D = ConstructVector3D(0, 0, -10);

 

            lowerAxisVector3D.XComponent += VectorComponentOffset;

 

            IVector3D normalVector3D = upperAxisVector3D.CrossProduct(lowerAxisVector3D) as IVector3D;

 

            normalVector3D.Magnitude = CircleRadius;

 

            double rotationAngleInRadians = GetRadians(CircleDegrees / CircleDivisions);

 

            for (int i = 0; i < CircleDivisions; i++)

            {

                normalVector3D.Rotate(-1 * rotationAngleInRadians, upperAxisVector3D);

 

                IPoint vertexPoint = ConstructPoint3D(originPoint.X + normalVector3D.XComponent,

                                                                      originPoint.Y + normalVector3D.YComponent,

                                                                      BaseZ);

 

                pathPointCollection.AddPoint(vertexPoint, ref _missing, ref _missing);

            }

 

            pathPointCollection.AddPoint(pathPointCollection.get_Point(0), ref _missing, ref _missing);

 

            //Rotate Geometry

 

            IVector3D rotationAxisVector3D = ConstructVector3D(0, 10, 0);

 

            ITransform3D transform3D = pathGeometry as ITransform3D;

            transform3D.RotateVector3D(rotationAxisVector3D, GetRadians(RotationAngleInDegrees));

 

            //Construct Polygon From Path Vertices

 

            IGeometry polygonGeometry = new PolygonClass();

 

            MakeZAware(polygonGeometry);

 

            IPointCollection polygonPointCollection = polygonGeometry as IPointCollection;

 

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

            {

                polygonPointCollection.AddPoint(pathPointCollection.get_Point(i), ref _missing, ref _missing);

            }

 

            ITopologicalOperator topologicalOperator = polygonGeometry as ITopologicalOperator;

            topologicalOperator.Simplify();

 

            //Define Vector To Extrude Along

 

            IVector3D extrusionVector3D = ConstructVector3D(10, 0, 5);

 

            //Perform Extrusion

 

            IConstructMultiPatch constructMultiPatch = new MultiPatchClass();

            constructMultiPatch.ConstructExtrudeRelative(extrusionVector3D, polygonGeometry);

 

            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;

 

            MakeZAware(point as IGeometry);

 

            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;

        }