ArcObjects Library Reference (Geometry)

IConstructMultiPatch.ConstructExtrudeBetween Method

Construct a MultiPatch by extruding a (non-point) geometry between two functional surfaces.

[Visual Basic .NET]
Public Sub ConstructExtrudeBetween ( _
    ByVal fromSurface As IFunctionalSurface, _
    ByVal toSurface As IFunctionalSurface, _
    ByVal baseGeom As IGeometry _
)

[C#]
public void ConstructExtrudeBetween (
    IFunctionalSurface fromSurface,
    IFunctionalSurface toSurface,
    IGeometry baseGeom
);

[C++]
HRESULT ConstructExtrudeBetween(
  IFunctionalSurface* fromSurface,
  IFunctionalSurface* toSurface,
  IGeometry* baseGeom
);

[C++]

Parameters
fromSurface 

  fromSurface is a parameter of type IFunctionalSurface
toSurface 

  toSurface is a parameter of type IFunctionalSurface
baseGeom 

  baseGeom is a parameter of type IGeometry

Product Availability

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

Description

Constructs a MultiPatch from a base non-point geometry and two input FunctionalSurfaces. The constructed MultiPatch is equivalent to the region of extrusion of the base geometry along the Z-axis that is bounded on top and bottom by the two FunctionalSurfaces. Only the portion of the input geometry in the region of intersection of the domains of the FunctionalSurfaces is extruded.

Remarks

All non-linear segments are treated as linear segments when extrusion is performed. Only Polylines, Polygons, and Envelopes are allowed as input geometries. Z values from the FunctionalSurfaces are only calculated at Points in the input Geometry. If the input Geometry extents exceed the extents of the Functional Surfaces then an output Oeometry with NaNs will be produced. Currently not implemented for RasterSurfaces.

IConstructMultiPatch ExtrudeBetween Example

[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=9.5;

const int PointCount=100;

const double UpperZMin=7;

const double UpperZMax=10;

const double LowerZMin=0;

const double LowerZMax=3;

//Extrusion: Circle Shaped Base Geometry Extruded Between Two Different TIN-Based Functional Surfaces

IGeometryCollection multiPatchGeometryCollection = new MultiPatchClass();

//Base Geometry

IPointCollection polygonPointCollection = new PolygonClass();

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=ConstructPoint2D(originPoint.X + normalVector3D.XComponent,

originPoint.Y + normalVector3D.YComponent);

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

}

IPolygon polygon=polygonPointCollection as IPolygon;

polygon.Close();

IGeometry baseGeometry=polygon as IGeometry;

ITopologicalOperator topologicalOperator=polygon as ITopologicalOperator;

topologicalOperator.Simplify();

//Functional Surfaces

IEnvelope envelope = new EnvelopeClass();

envelope.XMin=-10;

envelope.XMax=10;

envelope.YMin=-10;

envelope.YMax=10;

Random random = new Random();

//Upper Functional Surface

ITinEdit upperTinEdit = new TinClass();

upperTinEdit.InitNew(envelope);

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

{

double x=envelope.XMin + (envelope.XMax - envelope.XMin) * random.NextDouble();

double y=envelope.YMin + (envelope.YMax - envelope.YMin) * random.NextDouble();

double z=UpperZMin + (UpperZMax - UpperZMin) * random.NextDouble();

IPoint point=ConstructPoint3D(x, y, z);

upperTinEdit.AddPointZ(point, 0);

}

IFunctionalSurface upperFunctionalSurface=upperTinEdit as IFunctionalSurface;

//Lower Functional Surface

ITinEdit lowerTinEdit = new TinClass();

lowerTinEdit.InitNew(envelope);

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

{

double x=envelope.XMin + (envelope.XMax - envelope.XMin) * random.NextDouble();

double y=envelope.YMin + (envelope.YMax - envelope.YMin) * random.NextDouble();

double z=LowerZMin + (LowerZMax - LowerZMin) * random.NextDouble();

IPoint point=ConstructPoint3D(x, y, z);

lowerTinEdit.AddPointZ(point, 0);

}

IFunctionalSurface lowerFunctionalSurface=lowerTinEdit as IFunctionalSurface;

IConstructMultiPatch constructMultiPatch = new MultiPatchClass();

constructMultiPatch.ConstructExtrudeBetween(upperFunctionalSurface, lowerFunctionalSurface, baseGeometry);

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;

}

.NET Samples

3D multipatch examples (Code Files: ExtrusionExamples)

IConstructMultiPatch.ConstructExtrudeBetween Method

Product Availability

Description

Remarks

See Also

.NET Samples