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IVector3D Interface (ArcObjects .NET 10.8 SDK)
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IVector3D Interface

Provides access to 3D vector properties and operations.

Product Availability

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


A 3 Dimensional vector with an X Component, Y Component, and Z Component that correspond to the X-Axis, Y-Axis, and Z-Axis respectively.  The 3 Dimensional vector can also be defined in terms of spherical coordinates as an angle of rotation (Azimuth) from the YZ-Plane, angle of displacement (Inclination) from the XY-Plane, and a length (Magnitude).  This vector can be manipulated by any of the general Vector operations as well as operations specific to the third dimension.


Name Description
Method AddVector Construct a new vector by adding a different vector to this vector.
Read/write property Azimuth The vector's azimuth angle in radians.
Read/write property ComponentByIndex The component corresponding to a given index.
Method ConstructAddVector Set this vector by adding two input vectors.
Method ConstructCrossProduct Set this vector equal to the cross product of the two input vectors.
Method ConstructDifference Set the vector by taking the difference of point1 and point2 (so the vector would go from point2 to point1).
Method ConstructSubtractVector Set this vector by subtracting the second input vector from the first one.
Method CrossProduct Returns the cross product of this vector and another vector.
Read-only property Dimension The dimension of this vector.
Method DotProduct Returns the dot product of this vector and another vector.
Read/write property Inclination The vector's inclination in radians.
Read-only property IsEmpty Indicates if the vector is empty (unset).
Read/write property Magnitude The length of the vector.
Method Move Move the vector by adding a shift value to each component.
Method Normalize Normalize the vector (scale it to magnitude = 1).
Method PolarMove Modify the vector by adding to its polar components. Angles are in radians.
Method PolarQuery Get the vector's polar components. Angles are in radians.
Method PolarSet Set the vector using polar components. Angles are in radians.
Method QueryComponents Get the values of the vector's components.
Method Rotate Rotate the vector around an axis defined by another vector. The angle is in radians.
Method Scale Scale the vector by the given factor.
Method SetComponents Set the values of the vector's components.
Method SetEmpty Makes the vector empty (unset).
Method SubtractVector Construct a new vector by subtracting a different vector from this vector.
Read/write property XComponent The vector's X component.
Read/write property YComponent The vector's Y component.
Read/write property ZComponent The vector's Z component.

Inherited Interfaces

Interfaces Description
IVector Provides access to vector properties and operations.

Classes that implement IVector3D

Classes Description
Vector3D A 3D vector containing dx, dy, and dz components.



Vector3D Example



        private static object _missing = Type.Missing;

        public static IGeometry GetMultiPatchGeometry()


            const double ConeBaseDegrees = 360.0;

            const int ConeBaseDivisions = 36;

            const double VectorComponentOffset = 0.0000001;

            const double ConeBaseRadius = 6;

            const double ConeBaseZ = 0.0;

            const double ConeApexZ = 9.5;


            //Vector3D: Cone, TriangleFan With 36 Vertices


            IGeometryCollection multiPatchGeometryCollection = new MultiPatchClass();


            IPointCollection triangleFanPointCollection = new TriangleFanClass();


            //Set Cone Apex To (0, 0, ConeApexZ)


            IPoint coneApexPoint = ConstructPoint3D(0, 0, ConeApexZ);


            //Add Cone Apex To Triangle Fan


            triangleFanPointCollection.AddPoint(coneApexPoint, ref _missing, ref _missing);


            //Define Upper Portion Of Axis Around Which Vector Should Be Rotated To Generate Cone Base Vertices


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


            //Define Lower Portion of Axis Around Which Vector Should Be Rotated To Generate Cone Base Vertices


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


            //Add A Slight Offset To X or Y Component Of One Of Axis Vectors So Cross Product Does Not Return A Zero-Length Vector


            lowerAxisVector3D.XComponent += VectorComponentOffset;


            //Obtain Cross Product Of Upper And Lower Axis Vectors To Obtain Normal Vector To Axis Of Rotation To Generate Cone Base Vertices


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


            //Set Normal Vector Magnitude Equal To Radius Of Cone Base


            normalVector3D.Magnitude = ConeBaseRadius;


            //Obtain Angle Of Rotation In Radians As Function Of Number Of Divisions Within 360 Degree Sweep Of Cone Base


            double rotationAngleInRadians = GetRadians(ConeBaseDegrees / ConeBaseDivisions);


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


                //Rotate Normal Vector Specified Rotation Angle In Radians Around Either Upper Or Lower Axis


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


                //Construct Cone Base Vertex Whose XY Coordinates Are The Sum Of Apex XY Coordinates And Normal Vector XY Components


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

                                                      coneApexPoint.Y + normalVector3D.YComponent,



                //Add Vertex To TriangleFan


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



            //Re-Add The Second Point Of The Triangle Fan (First Vertex Added) To Close The Fan


            triangleFanPointCollection.AddPoint(triangleFanPointCollection.get_Point(1), ref _missing, ref _missing);


            //Add TriangleFan To MultiPatch


            multiPatchGeometryCollection.AddGeometry(triangleFanPointCollection as IGeometry, ref _missing, ref _missing);


            return multiPatchGeometryCollection as IGeometry;



        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 double GetRadians(double decimalDegrees)


            return decimalDegrees * (Math.PI / 180);


.NET Samples

3D multipatch examples 3D multipatch examples 3D multipatch examples 3D multipatch examples 3D multipatch examples 3D multipatch examples