How to create a multipatch using a series of triangles (ArcObjects .NET 10.6 SDK)
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How to create a multipatch using a series of triangles


Creating a multipatch using a series of triangles

The following code example shows how to construct a textured MultiPatch geometry using a TriangleStrip that resembles a vertical polygon, assuming it is 300 (width) x 100 (height) in size:
[C#]
public IMultiPatch CreateMultipatch()
{
    //Prepare the geometry material list.
    IGeometryMaterial texture=new GeometryMaterialClass();
    texture.TextureImage="C:\\Temp\\MyImage.bmp";

    IGeometryMaterialList materialList=new GeometryMaterialListClass();
    materialList.AddMaterial(texture);

    //Create the multipatch.
    IGeneralMultiPatchCreator multiPatchCreator=new GeneralMultiPatchCreatorClass()
        ;
    multiPatchCreator.Init(4, 1, false, false, false, 4, materialList);

    //Set up part.

    //Could also use a Ring or a TriangleFan.
    multiPatchCreator.SetPatchType(0, esriPatchType.esriPatchTypeTriangleStrip);
    multiPatchCreator.SetMaterialIndex(0, 0);
    multiPatchCreator.SetPatchPointIndex(0, 0);
    multiPatchCreator.SetPatchTexturePointIndex(0, 0);

    //Set real-world points.
    WKSPointZ upperLeft=new WKSPointZ();
    WKSPointZ lowerLeft=new WKSPointZ();
    WKSPointZ upperRight=new WKSPointZ();
    WKSPointZ lowerRight=new WKSPointZ();

    upperLeft.X=0;
    upperLeft.Y=0;
    upperLeft.Z=0;
    upperRight.X=300;
    upperRight.Y=0;
    upperRight.Z=0;
    lowerLeft.X=0;
    lowerLeft.Y=0;
    lowerLeft.Z= - 100;
    lowerRight.X=300;
    lowerRight.Y=0;
    lowerRight.Z= - 100;

    multiPatchCreator.SetWKSPointZ(0, ref upperRight);
    multiPatchCreator.SetWKSPointZ(1, ref lowerRight);
    multiPatchCreator.SetWKSPointZ(2, ref upperLeft);
    multiPatchCreator.SetWKSPointZ(3, ref lowerLeft);

    //Set texture points.
    //Set the texture coordinates for a panel.
    WKSPoint textureUpperLeft=new WKSPoint();
    WKSPoint textureLowerLeft=new WKSPoint();
    WKSPoint textureUpperRight=new WKSPoint();
    WKSPoint textureLowerRight=new WKSPoint();

    textureUpperLeft.X=0;
    textureUpperLeft.Y=0;
    textureUpperRight.X=1;
    textureUpperRight.Y=0;
    textureLowerLeft.X=0;
    textureLowerLeft.Y=1;
    textureLowerRight.X=1;
    textureLowerRight.Y=1;

    multiPatchCreator.SetTextureWKSPoint(0, ref textureUpperRight);
    multiPatchCreator.SetTextureWKSPoint(1, ref textureLowerRight);
    multiPatchCreator.SetTextureWKSPoint(2, ref textureUpperLeft);
    multiPatchCreator.SetTextureWKSPoint(3, ref textureLowerLeft);
    IMultiPatch multiPatch=multiPatchCreator.CreateMultiPatch()as IMultiPatch;

    return multiPatch;
}
[VB.NET]
Private Function CreateMultipatch() As IMultiPatch
    'Prepare the geometry material list.
    Dim texture As IGeometryMaterial=New GeometryMaterialClass()
    texture.TextureImage="C:\\Temp\\MyImage.bmp"
    Dim materialList As IGeometryMaterialList=New GeometryMaterialListClass()
    materialList.AddMaterial(texture)
    
    'Create the multipatch.
    Dim multiPatchCreator As IGeneralMultiPatchCreator=New GeneralMultiPatchCreatorClass()
    multiPatchCreator.Init(4, 1, False, False, False, 4, materialList)
    
    'Set up part.
    'Could also use a Ring or a TriangleFan.
    multiPatchCreator.SetPatchType(0, esriPatchType.esriPatchTypeTriangleStrip)
    multiPatchCreator.SetMaterialIndex(0, 0)
    multiPatchCreator.SetPatchPointIndex(0, 0)
    multiPatchCreator.SetPatchTexturePointIndex(0, 0)
    
    'Set real-world points.
    Dim upperLeft As WKSPointZ=New WKSPointZ()
    Dim lowerLeft As WKSPointZ=New WKSPointZ()
    Dim upperRight As WKSPointZ=New WKSPointZ()
    Dim lowerRight As WKSPointZ=New WKSPointZ()
    upperLeft.X=0
    upperLeft.Y=0
    upperLeft.Z=0
    upperRight.X=300
    upperRight.Y=0
    upperRight.Z=0
    lowerLeft.X=0
    lowerLeft.Y=0
    lowerLeft.Z=-100
    lowerRight.X=300
    lowerRight.Y=0
    lowerRight.Z=-100
    multiPatchCreator.SetWKSPointZ(0, upperRight)
    multiPatchCreator.SetWKSPointZ(1, lowerRight)
    multiPatchCreator.SetWKSPointZ(2, upperLeft)
    multiPatchCreator.SetWKSPointZ(3, lowerLeft)
    
    'Set texture points.
    'Set the texture coordinates for a panel.
    Dim textureUpperLeft As WKSPoint=New WKSPoint()
    Dim textureLowerLeft As WKSPoint=New WKSPoint()
    Dim textureUpperRight As WKSPoint=New WKSPoint()
    Dim textureLowerRight As WKSPoint=New WKSPoint()
    textureUpperLeft.X=0
    textureUpperLeft.Y=0
    textureUpperRight.X=1
    textureUpperRight.Y=0
    textureLowerLeft.X=0
    textureLowerLeft.Y=1
    textureLowerRight.X=1
    textureLowerRight.Y=1
    multiPatchCreator.SetTextureWKSPoint(0, textureUpperRight)
    multiPatchCreator.SetTextureWKSPoint(1, textureLowerRight)
    multiPatchCreator.SetTextureWKSPoint(2, textureUpperLeft)
    multiPatchCreator.SetTextureWKSPoint(3, textureLowerLeft)
    Dim multiPatch As IMultiPatch=CType(multiPatchCreator.CreateMultiPatch(), IMultiPatch)
    Return multiPatch
End Function


See Also:

Samples:




To use the code in this topic, reference the following assemblies in your Visual Studio project. In the code files, you will need using (C#) or Imports (VB .NET) directives for the corresponding namespaces (given in parenthesis below if different from the assembly name):
Development licensing Deployment licensing
ArcGIS Desktop Basic ArcGIS Desktop Basic
ArcGIS Desktop Standard ArcGIS Desktop Standard
ArcGIS Desktop Advanced ArcGIS Desktop Advanced
Engine Developer Kit Engine