1. AutoCAD Civil 3D 2008 API Overview Partha Sarkar
Developer Technical Services
Welcome to Civil 3D 2008 API presentation.

2. Legal Disclaimer
Autodesk may make statements regarding planned or future development efforts for our existing or new products and services in this document. These statements are not intended to be a promise or guarantee of future delivery of products, services or features but merely reflect our current plans, which may change.  Purchasing decisions should not be made based upon reliance on these statements.
Autodesk assumes no obligation to update these forward-looking statements to reflect events that occur or circumstances that exist or change after the date on which they were made.

3. Agenda New API in Civil 3D 2008 (Beta) Overview of Civil 3D API Points
Surfaces
Parcels
Alignments
Profiles
Sections
Custom Subassembly (VBA)
Survey
Piping
C++ API (customDraw)
New API in Civil 3D (Beta)
.NET based Subassembly
Enhancements to existing API
Agenda for Today’s session.
New!

4. Referencing the Automation Type Libraries
Before any coding begins, this ActiveX programming interface requires references to automation type libraries as follows:
AEC Base 5.5 Object Library (AecXBase)
AEC Base 5.5 Application Library (AecXUiBase)
Autodesk Civil Engineering Land 5.0 Object Library (AeccXLand)
Autodesk Civil Engineering UI Land 5.0 Object Library (AeccXUiLand)

5. Referencing the Automation Type Libraries
If referencing Roadway objects, then additional references must be added as follows:
Autodesk Civil Engineering Corridor 5.0 Object Library (AeccXRoadway)
Autodesk Civil Engineering UI Corridor 5.0 Object Library (AeccXUIRoadway)

6. Getting the Application Objects
Following is the recommended method (assuming VBA is used) to get an instance of AeccApplication:
Dim AeccApp as AeccApplication
Set AeccApp = ThisDrawing.Application.GetInterfaceObject("AeccXUiLand.AeccApplication")
VB users can get the AeccApplication object through an instance of the AutoCAD.Application object:
Dim oTest As AutoCAD.AcadApplication On Error Resume Next oTest = GetObject(,"AutoCAD.Application") If Err.Number <> 0 Then   Err.Clear()   oTest = CreateObject("AutoCAD.Application")   If Err.Number <> 0 Then     Exit Sub   End If End If Dim oAeccApp as AeccXUiLandLib.AeccApplication oAeccApp = oTest.GetInterfaceObject("AeccXUiLand.AeccApplication")

7. Points Dim point1 As Variant
AeccPoint Object in Civil 3D encapsulates a COGO point object, with associated information such as elevation, marker display styles, etc.
To create a new point with the given location use Add() method of AeccPoints Collection.
Dim point1 As Variant
Dim oPoint As AeccPoint
point1 = ThisDrawing.Utility.GetPoint(, “Select a Location : ")
Set oPoint = g_oAeccDb.Points.Add(point1)
oPoint.Elevation = 100
oPoint.RawDescription = "Test Description"
oPoint.Name = "Mytest Point"

8. Points – Import / Export from External Files
To import points into Civil 3D from ASCII (text) file or a Microsoft Access database (.mdb) file, use the ImportPoints() method.
Public Sub InsertPoints()
getCivilObjects
Dim cPoints As AeccPoints
Dim options As New AeccPointImportOptions
options.ExpandCoordinateData = True
Set cPoints = g_oAeccDb.Points
cPoints.ImportPoints "c:\Existing Ground Points -
PENZD.txt", "PENZD (space delimited)", options
End Sub
Note -1. This method will fail if you don't specify a supported FileFormatName.
Note -2. When you add points using the ImportPoints method, it is possible that the point
Numbers will conflict with those that already exist in the drawing. In such cases, the user is given
an option to renumber the point numbers from the file, or to cancel the operation which will result
with a Visual Basic error. An application that uses ImportPoints should take this into account.
oImportOptions.PointDuplicateResolution = aeccPointDuplicateOverwrite
For more option refer to - AeccPointImportOptions class
Similar to Import we have an API to Export points – oPoints.ExportPoints sFilename, sFileFormat, oExportOptions

9. Points – Import / Export from External Files
The second parameter of the ImportPoints and ExportPoints methods is a string that describes how the point values are stored in the file. The following table lists some commonly available file formats. Custom formats can be created by using the Point File Format dialog box.

10. Points Adding to Point Group
' Add point 1 and point 2 to the point group.
oPtGroup.QueryBuilder.IncludeNames = "point1," & oPoint2.Name
' Add point 3 to the point group by using its number.
oPtGroup.QueryBuilder.IncludeNumbers = oPoint3.Number
' You can also use wildcards. The following would select all points with a ‘ name beginning with "pol".
oPtGroup.QueryBuilder.IncludeNames = "pol*"
' Exclude those points with an alitude above 300.
oPtGroup.QueryBuilder.ExcludeElevations = ">300"
' And include those points with identification numbers 100 through 200
' inclusive, and point number 206.
oPtGroup.QueryBuilder.IncludeNumbers = " ,206"
Points can be placed into a point group by using the QueryBuilder, which is a mechanism for selecting from among all the points in the document. The AeccPointGroup.QueryBuilder property is an object of type AeccPointGroupQueryBuilder, and contains many different properties that allow including or excluding points based on a specific criteria.

11. Surfaces
Surfaces are basic building blocks in Autodesk Civil 3D. A surface is a three-dimensional geometric representation of the surface of an area of land, or, in the case of volume surfaces, is a difference or composite between two surface areas. Points or contours are usually a primary part of the original surface information and are supplemented with breaklines and boundaries. Breaklines are constraint lines, such as retaining walls, stream banks and beds, ridge lines, curbs, and other abrupt changes in the surface.

12. Surfaces
AddTinSurface() method creates a new TIN surface using the specified creation data.
Public Sub createSurfaceByImport()
If getCivilObjects = True Then
Dim oSurface As AeccSurface
Dim oTinSurfaceData As New AeccTinCreationData
Const sPointFile = "D:\C3D2008API\Points_PENZD.txt"
oTinSurfaceData.Description = "Existing Surface"
oTinSurfaceData.Name = "adsk_EG"
Dim oTinSurface As AeccTinSurface
Set oTinSurface = g_oAeccDb.Surfaces.AddTinSurface(oTinSurfaceData)
oTinSurface.DefinitionProperties.UseAddPoint = True
oTinSurface.PointFiles.Add (sPointFile)
' Setting a criteria to Exclude Points with an
' Elevation Less Than a value (here set to 100)
oTinSurface.DefinitionProperties.ExcludeElevationsLessThan = True
oTinSurface.DefinitionProperties.LowerElevation = 100
oTinSurface.Rebuild
End If
End Sub
We can create an empty TIN surfaces by adding it to the document’s collection of surfaces through the AeccSurfaces.AddTinSurface method. This method requires preparing an object of type AeccTinCreationData. It is important to specify every property of the AeccTinCreationData object to avoid errors.

13. Surfaces – Create From LandXML
Using AeccSurfaces:: ImportXML() Method we can add a LandXML surface data file to create a new Surface (AeccSurface) in Civil 3D.
Dim oSurface As AeccSurface
Dim sFileName As String
sFileName = “D:\My_Temp\EG.xml"
Set oSurface = oAeccDocument.Surfaces.ImportXML(sFileName)
Dim oTinSurface as AeccTinSurface
If (oSurface.Type = aecckTinSurface) Then
Set oTinSurface = oSurface
End If
A surface saved as a LandXML file can be loaded using the AeccSurfaces.ImportXML method. The file also describes the kind of surface that will be created, so you do not need to know beforehand. After the surface has been loaded, you can examine the AeccSurface.Type property and assign the generic surface reference to a more specific type.

14. Surfaces – Adding DEM files / Contours / BreakLine etc
‘ Adding a DEM file
oTinSurface.DEMFiles.Add("D:\Temp_Test\file1.dem")
' adding a contour to a surface
Dim oNewContour As AeccSurfaceContour
Set oNewContour = oTinSurf.Contours.Add(oEntities, "Sample Contour", dWeedDist, dWeedAngle, dDist, dMidOrdDist)
' adding a Standard BreakLine
ThisDrawing.Utility.GetEntity Ent, Pt, "Select a polyline for breakline"
Set SelObjs(0) = Ent
Set oBrkLn = oTinS.Breaklines.AddStandardBreakline(SelObjs, BrklnDesc, 1#)
oTinS.Rebuild
Any number of DEM files can be added to existing grid and TIN surfaces. When a DEM file is added to the AeccGridSurface.DEMFiles or AeccTinSurface.DEMFiles collection, its information is converted to an evenly spaced lattice of triangles which is added to the surface.

15. Surfaces
Use AeccTinVolumeSurface to perform a volume calculation i.e. cut & fill quantities.
Dim oSurfaces As AeccSurfaces
Dim oTinVolSurfData As New AeccTinVolumeCreationData
Set oTinVolSurfData.BaseSurface = g_oAeccDb.Surfaces.Item(“EG")
Set oTinVolSurfData.ComparisonSurface = g_oAeccDb.Surfaces.Item("FG")
oTinVolSurfData.Name = "adsk_TinVol"
Dim oTinVolSurface As AeccTinVolumeSurface
Set oTinVolSurface = g_oAeccDb.Surfaces.AddTinVolumeSurface(oTinVolSurfData)
Dim CutVol As Long, FillVol As Long, NetVol As Long
CutVol = oTinVolSurface.Statistics.CutVolume
FillVol = oTinVolSurface.Statistics.FillVolume
NetVol = oTinVolSurface.Statistics.NetVolume
AeccTinVolumeSurface - created from a composite of points based on a top and bottom surface, also known as a differential surface.

16. Surfaces Dim oSurf As AeccSurface
We can create a 3dPolyline between two selected points on the surface along with a LWPolyline. Viewing them together in an Object Viewer will show the actual surface profile between the selected points. Use the SampleElevations function to get the point array between two selected points on the surface.
Dim oSurf As AeccSurface
Set oSurf = g_oAeccDb.Surfaces.Item(0)
If oSurf Is Nothing Then
MsgBox "Error: no surface exists."
End If
Set oSurf = g_oAeccDoc.Surfaces.Item(0)
oPoint1 = ThisDrawing.Utility.GetPoint(, "Select a point on the surface ")
oPoint2 = ThisDrawing.Utility.GetPoint(oPoint1, "Select a point on the surface ")
pointarray = oSurf.SampleElevations(oPoint1(0), oPoint1(1), oPoint2(0), oPoint2(1))
Set polyObj = ThisDrawing.ModelSpace.Add3DPoly(pointarray)
IAeccSurface:: SampleElevations Method
For a given StartPoint and EndPoint, returns an array of doubles consisting of points (northing, easting, elevation) derived from the surface along the line.

17. Parcels
AeccParcel objects in Autodesk Civil 3D are typically used to represent real estate parcels, such as lots in a subdivision. Parcel objects can also represent other features with closed boundaries, such as bodies of water and soil regions.

18. Sites
All sites in a document are held in the AeccDocument.Sites collection, an object of type AeccSites. The AeccSites.Add method will create a new empty site with the specified name.
' Create a new site.
Dim oSites As AeccSites
Set oSites = oAeccDocument.Sites
Dim oSite As AeccSite
Set oSite = oSites.Add("Sample Site")
Site objects are used as containers for - parcels, alignments, gradings, and feature lines etc.
Examples of sites include soil maps, watersheds, or subdivisions. Sites can geographically overlay each other - For example, a soils map and a subdivision with roads and lots can overlay each other, but remain independent of each other.

19. Parcels
To create a Parcel, we need to access an existing AeccSite object and next start creating AeccParcelSegment objects for each side of the parcel boundary. Use properties of AeccParcelSegment objects like AddLine, AddCurve, etc to define the physical outline of the parcel.
Set oSite = g_oAeccDb.Sites.Item(0)
Const sParcelStyleName = "Adsk_ParcelStyle"
Dim oParcelStyle As AeccParcelStyle
Const sLbl = "adsk_ParcelLabelStyle"
Dim oParcelLabelStyle As AeccLabelStyle
Set oParcelStyle = g_oAeccDb.ParcelStyles(sParcelStyleName)
Set oParcelLabelStyle = g_oAeccDb.ParcelLabelStyles.AreaLabelStyles.Item(sLbl )
Dim oPSeg01 As AeccParcelSegment
Dim oPSeg02 As AeccParcelSegment
Set oPSeg01 = oSite.ParcelSegments.AddLine(0, 0, 0, 200)
Set oPSeg02 = oSite.ParcelSegments.AddCurve(0, 200, -0.5, 200, 200)
While a site contains a collection of parcels, this collection had no Add method. Instead, parcels are automatically generated from the parcel segments added to the AeccSite.ParcelSegments collection. A parcel segment is a 2-dimensional line, curve, or AutoCAD entity. Once a closed structure can be formed from the segments in the site, a parcel is automatically formed. Each additional parcel segment that forms new closed structures will create additional parcels. This may affect the shape of existing parcels - if an existing parcel is bisected by a new segment, the existing parcel is reduced in size and a new parcel is formed.

20. Parcels - Settings
AeccSite site class has many essential properties which allows Set and Get these settings like - NextAutoCounterParcel , NextManualCounterParcel, NextAutoCounterParcelLine etc.
For Each oSite In g_oAeccDoc.Sites
If oSite.Name = sSiteName Then GoTo SiteFound
Next
Set oSite = g_oAeccDoc.Sites.Add(sSiteName)
oSite.NextAutoCounterParcel = 20
oSite.NextManualCounterParcel = 20
oSite.NextAutoCounterParcelCurve = 20
oSite.NextAutoCounterParcelLine = 20
AeccSite site class has many essential properties which allows Set and Get these settings like - NextAutoCounterParcel , NextManualCounterParcel, NextAutoCounterParcelLine etc.
Refer IAeccSite Interface in Civil 3D API Help file.

21. Parcels - Statistics 'Check if parcel exists in the drawing
AeccParcelStatistics Object encapsulates statistical data about the parcel, such as area and perimeter.
'Check if parcel exists in the drawing
Dim oParcel As AeccParcel
If oSite.Parcels.Count = 0 Then
MsgBox "No parcels found"
Exit Sub
Else
Set oParcel = oSite.Parcels.Item(0)
End If
' Display parcel statistics
MsgBox "Parcel name : " & oParcel.Name & vbLf _
& "Area : " & Format(CStr(oParcel.Statistics.Area), "0.####") & vbLf _
& "Perimeter : " & Format(CStr(oParcel.Statistics.Perimeter), "0.####")
AeccParcelStatistics Object encapsulates statistical data about the parcel, such as area and perimeter.

22. Alignments
Alignment objects can represent centerlines, lanes, shoulders, right-of ways, or construction baselines. Creating and defining the horizontal alignment is one of the first steps in roadway, railroad, or site design. You can draw the alignment geometry as a polyline and create the named alignment from that geometry, or create an alignment object using the Alignment Layout Tools. You can also make edits to alignments using grips, or the commands on the Alignment Layout Tools toolbar, while automatically maintaining tangency between the alignment components.
You create alignments as a combination of lines, curves, and spirals that are viewed as one object.

23. Alignments
We create alignments as a combination of lines, curves, and spirals that are viewed as one object. Alignments can be stand-alone objects or the parent object of profiles, profile views, and cross sections. If we edit an alignment, the changes are automatically reflected in any related objects.
Dim oAlignment As AeccAlignment
Set oAlignment = g_oAeccDb.Sites.Item("adsk_site1").Alignments.Add(strAlignName, "alignment", g_oAeccDb.AlignmentStyles.Item("Design Style"), g_oAeccDb.AlignmentLabelStyleSets.Item("All Labels"))
Dim fstLine As AeccAlignmentTangent
Set fstLine = oAlignment.Entities.AddFixedLine1(pt1, pt2)
Other methods...
AddFreeCurve1()
AddFloatingCurve1()
AddFixedSpiral1()
Alignments are usually created in existing sites. Each AeccSite object has its own collection of alignments, held in an AeccAlignments object in the AeccSite.Alignments property. There is also a collection of alignmnets that are not associated with a site in the AeccDocument.AlignmentsSiteless property – we shall talk about it shortly.
An alignment is made up of a series of entities, which are individual lines, curves, and spirals that make up the path of an alignment. A collection of entities is held in the AeccAlignment.Entities collection. This collection has a wide array of methods for creating new entities.

24. Alignments Dim Curve1 As AeccAlignmentArc
Sub AlignmentWithAddFreeSTSGroup1()
Dim Curve1 As AeccAlignmentArc
Dim Curve2 As AeccAlignmentArc
' Create the 1st Curve
Set Curve1 = oAlignment.Entities.AddFixedCurve1(0, pt1, pt2, pt3)
' Create the 2nd Curve
Set Curve2 = oAlignment.Entities.AddFixedCurve1(0, pt1, pt2, pt3)
' Add STS (Spiral-Line-Spiral)
oAlignment.Entities.AddFreeSTSGroup1 Curve1.Id, Curve2.Id, 30, 25, aeccAlignmentSpiralClothoid, True
End Sub
AeccAlignmentEntities class has lots of method to add various entities.
This particular slide talks about AeccAlignmentEntities:: AddFreeSTSGroup1 Method ->Add STS (Spiral-Line-Spiral) constrained by the two spiral parameters(Length or A-value).

25. Alignment - Create From Offset of Another Alignment
Alignments can also be created based on the layout of
existing alignments. The AeccAlignment.Offset method
will create a new alignment with a constant offset and
add it to the same parent site as the original alignment.
' Add an offset alignment 10.0 units to the left of the original.
oAlignment.Offset -10.0
Alignments can also be created based on the layout of existing alignments. The AeccAlignment.Offset method will create a new alignment with a constant offset and add it to the same parent site as the original alignment.
The new alignment will have the same name (followed by a number in parenthesis) and the same style as the original, but it will not inherit any station labels, station equations, or design speeds from the original alignment.

26. Alignment - Add Station Equation
Dim oAlign As AeccAlignment
Dim oStationEquation As AeccStationEquation
ThisDrawing.Utility.GetEntity obj, pt, "pick alignment"
If TypeOf obj Is AeccAlignment Then
Set oAlign = obj
End If
Set oStationEquation = oAlign.StationEquations.Add(700, 0, 1100, aeccIncreasing)
A station is a point along an alignment at certain distance from the start of the alignment. By default the station at the start point of an alignment is 0 and increases contiguously through its length. This can be changed by using station equations. A station equation is an object of type AeccStationEquation which contains a location along the alignment, a new station number basis, and a flag describing whether station values should increase or decrease from that location on. A collection of these station equations is contained in the AeccAlignment.StationEquations property.
'Civil 3D Sample dwg file \Drawings\Align-3.dwg used to test the code sample

27. Alignment - Add Design Speeds
If TypeOf obj Is AeccAlignment Then
Set oAlign = obj
' Starting at station
Set oDesignSpeed = oAlign.DesignSpeeds.Add(0#)
oDesignSpeed.Value = 40
oDesignSpeed.Comment = "Straightaway"
' Starting at station
Set oDesignSpeed = oAlign.DesignSpeeds.Add(100#)
oDesignSpeed.Value = 60
oDesignSpeed.Comment = "Straight Road"
' Starting at station to the end.
Set oDesignSpeed = oAlign.DesignSpeeds.Add(600#)
oDesignSpeed.Value = 45
oDesignSpeed.Comment = "Curves start here"
ZoomExtents
MsgBox "Design Speeds are Added to Alignment !"
End If
'Civil 3D Sample dwg file \Drawings\Align-3.dwg used to test the code sample –
You can assign design speeds along the length of an alignment to aid in the future design of a roadway based on the alignment. The collection of speeds along an alignment are contained in the AeccAlignment.DesignSpeeds property. Each item in the collection is an object of type AeccDesignSpeed, which contains a raw station value, a speed to be used from that station on until the next design speed specified or the end of the alignment, and an optional string comment.

28. Siteless Alignments AlignmentsSiteless
Alignments can now be created outside of sites. The AeccDocument object contains a new property called AlignmentsSiteless which contains a collection of alignments.
' Get the collection of all siteless alignments.
Dim oAlignments as AeccAlignments
Set oAlignments = oDocument.AlignmentsSiteless
New!
This is New Addition in Civil 3D 2008 API

29. Siteless Alignments – What is it ?
If Alignments are placed on a site, they will interact with other objects on the site in two ways :
If an alignment exists on a site with parcels, the alignment will subdivide any parcels it crosses over.
If one or more alignments on a site form a closed region, a parcel will be created from the region.
If you do not want an alignment to interact with other objects use this new object - AlignmentsSiteless while creating an Alignment.
Let us try to understand what is a Siteless Alignment. Explain the above slide.

30. Profiles
There are two distinct Civil 3D entities when using Profiles, the Profile itself and the Profile View. The Profile is the actual section cut through a surface or the proposed design profile and has it's associated style and label style. The Profile View is the data surrounding the display of the profile line - grids, axes, labels and desired band styles, which contain data on any side of the grid, horizontal / vertical geometry data etc.

31. Profiles 'Create a profile named "Adsk Sample Profile"
Dim oProfile As AeccProfile
Set oProfile = oProfiles.AddFromSurface(sProfileName, aeccExistingGround, oProfileStyle, _
oSurf.Name, oAlignment.StartingStation, oAlignment.EndingStation, "0")
If oProfile Is Nothing Then
MsgBox "Error creating an existing ground profile"
Exit Sub
End If
'Set properties to the newly created profile
oProfile.Style.LineDisplayStyle2d.color = acRed
oProfile.Style.PVIPointDisplayStyle2d.color = acGreen
A profile is a display of elevations along an alignment. Each alignment contains a collection of profiles in its AeccAlignment.Profiles property. The AeccProfiles.Add method will add a new profile to the collection with no elevation information. The AeccProfiles.AddFromSurface will derive its elevation information from the specified surface along the path of the alignment.

32. Profiles Creating a Profile View –
'Set parameters that are need to create a profile view
Dim oProfileView As AeccProfileView .
'Get access to existing AeccProfileViewBandStyleSet in the drawing
Dim oPVBandStyleSet As AeccProfileViewBandStyleSet
Set oPVBandStyleSet = g_oAeccDoc.ProfileViewBandStyleSets.Item(0)
'Create a Profile view by adding a AeccProfileView object to the ProfileViews collection
If oProfileView Is Nothing Then
Set oProfileView = oAlignment.ProfileViews.Add(sPViewName, _
sLayerName, originPt, oPVStyle, oPVBandStyleSet)
End If
A profile view, an object of type AeccProfileView, is a graphical display of profiles within a graph. A collection of profile views is contained in each alignment’s AeccAlignment.ProfileViews property.

33. Profiles Creating a Profile By Layout –
'Add a new profile to the AeccAlignment object
Dim oProfl As AeccProfile
Set oProfl = oAlignment.Profiles.Add("FGProfile",
aeccFinishedGround, "Finished Ground",
oAlignment.StartingStation, oAlignment.EndingStation, "0")
Dim oPVIs As AeccProfilePVIs
Set oPVIs = oProfl.PVIs
'Add PVIs to the profile
oPVIs.Add , 286.7, aeccTangent
oPVIs.Add , , aeccTangent
oPVIs.Add , , aeccTangent
oPVIs.Add , , aeccTangent
oPVIs.Add , , aeccTangent
oPVIs.Add , 289.3, aeccTangent
This slide shows a code snippet on ‘Creating a Profile by Layout’.
AeccProfilePVIs Object -> For profiles, it is the collection of points where two tangent lines meet (Points of Vertical Intersection).

34. Sections
Typically, sections are cut across horizontal (plan) alignments at a specified station interval using specified swath widths. These sections are then plotted, individually for a station, or as a group for a range of stations.
A section is a cross section of one or more surfaces along a sample line. A series of sections can be used to analyze the changes in a surface along a path.

35. Sections Creating Sample Lines – ' Create a sample line group
Dim oSampleLineGroup As AeccSampleLineGroup
Set oSampleLineGroup = oAlignment.SampleLineGroups.Add(sSLGName,
sLayerName, oGPStyle, oSLStyle, oSLabelStyle)
'Set parameters for sample line
Dim oSampleLine As AeccSampleLine
Const sKey = "Adsk Sample Line"
Dim dStationID As Double
dStationID =
Dim dLeftSwathLenghth As Double
dLeftSwathLenghth = 30#
'Create sample line by Station
If oSampleLine Is Nothing Then
Set oSampleLine = oSampleLineGroup.SampleLines.AddByStation(sKey,
dStationID, dLeftSwathLenghth, dRightSwathLenghth)
End If
Sample lines are line segments placed along an alignment, usually perpendicular to the alignment path and at regular intervals. Sample lines represent the location and orientation of surface cross sections that can be studied through section views.
Sample lines are created in groups. All sample line groups for an alignment are held in the AeccAlignment.SampleLineGroups collection.

36. Sections 'Set parameters for section view Creating Section View –
Const sSectionView = "Adsk Section View"
Const sLayer = "Adsk Layer"
Dim originPt(0 To 2) As Double
' Select the Origin Point
'Set section view style for the section view
Dim oSVStyle As AeccSectionViewStyle
'Set section view band style set for the section view
Dim oSVBStyleSet As AeccSectionViewBandStyleSet
'Create section view
Dim oSectionView As AeccSectionView
If oSectionView Is Nothing Then
Set oSectionView = oSampleLine.SectionViews.Add(sSectionView,
sLayer, originPt, oSVStyle, oSVBStyleSet)
End If
A section view is a graph of a single sample line’s sections. Each sample line contains a collection of section views in its AeccSampleLine.SectionViews property. To create a new section view, use the AeccSectionViews.Add method, which takes as parameters the name of the new section view, the layer to draw to, the location, the style of the view, and an optional data band set. Each section view is automatically constructed to display the sections at that sample line in the center of an appropriately sized graph. As each sample line may have different lengths and represent different surface altitudes, each section view may be different in size or in what units are displayed along each graph axis.

37. Corridors & Subassemblies
A corridor model builds on and uses various Autodesk Civil 3D objects and data, including subassemblies, assemblies, alignments, surfaces, and profiles. Corridor objects are created a baseline (alignments) by placing a 2D section (assembly) at incremental locations and by creating matching slopes that reach a surface model at each incremental location
A corridor represents a path, such as a road, trail, railroad, or airport runway. The geometry of a corridor is defined by a horizontal alignment and a profile. Together, these form the baseline - the centerline of the 3D path of the corridor. Along the length of the baselines are a series of assemblies which define the cross-sectional shape of the alignment. Common points in each assembly are connected to form feature lines. Together the assemblies and feature lines form the 3D shape of a corridor. A corridor also has one or more surfaces which can be compared against an existing ground surface to determine the amount of cut or fill required.

38. Creating Custom Subassemblies
Subassemblies are the basic building blocks of a corridor design. A subassembly is an AutoCAD drawing object (AECCSubassembly) that defines the geometry of a component used in a corridor section. Through the tool palette and tool catalogues, Autodesk Civil 3D provides preconfigured subassemblies for components such as carriageways, kerbs, batter slopes and ditches. These subassemblies are defined by a set of points, links, and optionally closed areas referred to as shapes. The subassemblies provided with Autodesk Civil 3D have built-in intelligent behavior.

39. Creating Custom Subassemblies
You can develop Visual Basic for Applications (VBA) scripts to define custom subassemblies that provide specific behavior. The actions that occur when a subassembly is used in an assembly, and when subassemblies are processed during corridor creation, are specified through VBA scripts. The Autodesk Civil 3D COM API includes objects, methods, and properties specifically designed to provide an interface to assemblies and corridor models for subassembly VBA scripts.

40. Creating Custom Subassemblies
VBA Structure for Subassemblies -
Each subassembly should have a separate module in the VBA library, where the module name matches the subassembly name. For example, the subassembly “adskRailType01” is executed by the subroutines in a module that is also called “adskRailType01”.
There are several standard subroutines that must be implemented for each subassembly within its module. These subroutines are described below for a sample subassembly called adskRailType01.

41. Creating Custom Subassemblies
VBA Structure for Subassemblies -

42. Creating a Subassembly Tool Catalog
You can create an Autodesk tool catalog to organize groups of customized subassemblies and make them available to Autodesk Civil 3D users. Autodesk tool catalogs are defined using xml-formatted files with an .atc (Autodesk Tool Catalog) extension. You also need to create a catalog registry file since catalogs must be registered in the Windows registry. Some items within the .atc and registry files must contain unique identifiers known as GUIDs (Global Unique Identifiers).

43. Creating a Subassembly Tool Catalog
Sample Tool Catalog ATC File –
1. <Catalog>
2. <ItemID idValue="{410D0B43-19B3-402F-AB41-05A6E174AA3F}"/>
3. <Properties>
4. <ItemName>Corridor Modeling Catalogs (Imperial)</ItemName>
5. <Images>
6. <Image cx="93" cy="123" src=".\Images\AeccCorridorModel.png"/>
7. </Images>
8. <AccessRight>0</AccessRight>
9. <Description>This catalog contains Subassembly tools for corridor modeling with Imperial units.</Description>
<Refer Civil 3D Help File for the complete Sample>
You can create an Autodesk tool catalog to organize groups of customized subassemblies and make them available to AutoCAD Civil 3D users.
Autodesk tool catalogs are defined using xml-formatted files with an .atc (Autodesk Tool Catalog) extension. You also need to create a catalog registry file since catalogs must be registered in the Windows registry. Some items within the .atc and registry files must contain unique identifiers known as GUIDs (Global Unique Identifiers).

44. Corridors AeccBaseline.AddStation AeccBaseline.DeleteStation
New Methods in Civil 3D 2008 :
AeccBaseline.AddStation
AeccBaseline.DeleteStation
AeccCorridors.Add
AeccCorridor.AddBaseline
New!

45. Survey Function GetSurveyObjects()
' Function to set up the Civil 3D Survey application, document and database object
Dim oApp As AcadApplication
Set oApp = ThisDrawing.Application
Dim sAppName As String
sAppName = "AeccXUiSurvey.AeccSurveyApplication"
Set g_oCivilSurveyApp = oApp.GetInterfaceObject(sAppName)
If g_oCivilSurveyApp Is Nothing Then
MsgBox "Error creating " & sAppName & ", exit."
GetCivilObjects = False
Exit Function
End If
Set g_oAeccSurveyDoc = g_oCivilSurveyApp.ActiveDocument
End Function
Applications that perform survey operations require appropriate versions of the base objects representing the application and document. The AeccSurveyApplication object is identical to the AeccApplication it is inherited from except that its AeccSurveyApplication.ActiveDocument property returns an object of type AeccSurveyDocument instead of AeccDocument. The AeccSurveyDocument object contains collections of survey related items, such as projects and equipment databases in addition to all of the methods and properties of AeccDocument.
When using survey root objects, be sure to reference the “Autodesk Civil Engineering Survey 5.0 Object Library” (AeccXSurvey.tlb) and “Autodesk Civil Engineering UI Survey 5.0 Object Library” (AeccXUISurvey.tlb) libraries.

46. Survey Set oSurveyProjs = g_oAeccSurveyDoc.Projects
‘ Create a Survey Project
Set oSurveyProjs = g_oAeccSurveyDoc.Projects
If oSurveyProjs.Count = 0 Then
Set oSurveyProj = oSurveyProjs.Create("Survey 1")
Else
'Create a Survey network
Set oNetworks = oSurveyProj.Networks
If oNetworks.Count = 0 Then
Set oNetwork = oSurveyProj.Networks.Create("Survey Network 1")
A project is the high-level construct that contains collections of networks and figures, and provides access to survey points. The collection of all projects in a document are held in the -
Aeccsurveydocument.property.
Once created, a project cannot be removed from this collection. When a new project is created, a unique guid identifying the project is generated.

47. Survey – Create Figures / Lineworks
‘ Add Figure Objects
Dim oFigure As AeccSurveyFigure
Set oFigure = oSurveyProject.Figures.Create("Figure_01")
' Draw a line to the location of survey point 3001.
Dim oPoint1 As AeccSurveyPoint
Set oPoint1 = oSurveyProject.GetPointByNumber(3001)
oFigure.AddLineByPoint oPoint1.Easting, oPoint1.Northing, 3001
' Draw a line 30 meters long at 10 degrees from the major axis.
oFigure.AddLineByAzimuthDistance , 30
A collection of all figures in the survey database are stored in the AeccSurveyProject.Figures property. New figures are made using the collection’s Create() method.
Each line added to a figure is drawn from the endpoint of the previous line or arc. The new line can be drawn to a particular point location, for a distance along an absolute azimuth, or for a distance along an azimuth relative to the direction of the previous line.
AddLineByPoint adds a line to the figure to the specified point location. An optional parameter can specify a survey point to reference so that whenever it changes the figure vertex will change as well.
AddLineByAzimuthdistance adds a line to the figure of the specified length and of the specified angle from the survey project’s major axis.

48. Survey – Add Figures to Drawing
Adding lines and arcs to a figure changes the survey database but does not automatically change the drawing. After adding elements to the figure use AeccSurveyFigure.AddToDrawing method to make them visible and editable through the user interface.
'Save figure and write it to drawing
oFig.Save
oFig.AddToDrawing
ThisDrawing.Application.ZoomExtents

49. Pipe Network
A pipe network object manages a collection of pipe objects and structure objects that are associated with each other to represent a pipe system.
Typically, the pipes and structures are connected to each other, forming a single pipe run or pipe network. The pipe and structure objects in a pipe network are typically associated with an alignment, and/or a surface(s), which provide them with station offset and elevation data.
The pipe network object is used as the container object to associate pipes and structures that are part of the same pipe run or pipe network. A pipe network typically contains pipe objects and structure objects.

50. Pipe
A pipe object is a drawing shape that represents straight or curved pipes used in utility networks, such as sewer and irrigation systems. In a drawing, the three-dimensional pipe shape is defined by: 1) the two-dimensional Part Shape (circular, elliptical, egg-shaped, or rectangular) of the pipe part that is selected from the part catalog; and 2) by specifying a linear path (for straight piped) or a curved path (for curved piped). Object names for pipes are not displayed in the Prospector tree. They are, however, displayed in the Prospector list view when you click Pipes under a pipe network in the Prospector tree.

51. Structure
A structure object is a drawing shape that is used to represent items, such as manholes, catch basins, and headwalls, used in utility networks. Structure shapes are inherently more complex than pipe shapes. In a drawing, the three-dimensional structure shape is defined by the definition of the structure part that is selected from the part catalog. Like pipes, object names for structures are not displayed in the Prospector tree. They are, however, displayed in the Prospector list view when you click Structures under a pipe network in the Prospector tree.

52. Getting the Pipe Application Objects
Following is the recommended method (assuming VBA is used) to get an instance of AeccPipeApplication:
Dim AeccPipeApp as AeccPipeApplication AeccPipeApplication
Set AeccPipeApp = ThisDrawing.Application.GetInterfaceObject("AeccXUiPipe.AeccPipeApplication")
VB users can get the AeccPipeApplication object through an instance of the AutoCAD.Application object:
Dim oTest As AutoCAD.AcadApplication On Error Resume Next oTest = GetObject(,"AutoCAD.Application") If Err.Number <> 0 Then   Err.Clear()   oTest = CreateObject("AutoCAD.Application")   If Err.Number <> 0 Then     Exit Sub   End If End If Dim oAeccPipeApp as AeccXUiPipe.AeccPipeApplication oAeccApp = oTest.GetInterfaceObject("AeccXUiPipe.AeccApplication")
Applications that access pipe networks require special versions of the base objects representing the application and document. The AeccPipeApplication object is identical to the AeccApplication it is inherited from except that its AeccPipeApplication.ActiveDocument property returns an object of type AeccPipeDocument instead of AeccDocument. The AeccPipeDocument object contains collections of pipe related items, such as pipe networks, pipe styles, and interference checks in addition to all of the methods and properties of AeccDocument.
When using pipe root objects, be sure to reference the “Autodesk Civil Engineering Pipe 5.0 Object Library” (AeccXPipe.tlb) and “Autodesk Civil Engineering UI Pipe 5.0 Object Library” (AeccXUIPipe.tlb) libraries.

53. Create Pipe Network ' set the reference alignment and surface
To create Network, you should get the networks through AeccPipeDocument firstly, then use add method to create it or use Item method to return it by inputting the name
Dim oNetworks As AeccPipeNetworks
Dim oNetwork As AeccPipeNetwork
Set oNetworks = g_oAeccPipeDoc.PipeNetworks
Set oNetwork = Nothing
Set oNetwork = oNetworks.Item("SampleNetwork")
If oNetwork Is Nothing Then
Set oNetwork = oNetworks.Add("SampleNetwork")
End If
' set the reference alignment and surface
Dim oAlign As AeccAlignment
Dim oSurface As AeccSurface
Set oAlign = g_oAeccPipeDoc.Sites.Item(0).Alignments.Item("ROAD1")
Set oSurface = g_oAeccPipeDoc.Surfaces.Item("EG")
oNetwork.ReferenceAlignment = oAlign
oNetwork.ReferenceSurface = oSurface
A pipe network is a set of interconnected or related parts. The collection of all pipe networks are held in the AeccPipeDocument.PipeNetworks property. A pipe network, an object of type AeccPipeNetwork, contains the collection of pipes and the collection of structures which make up the network. AeccPipeNetwork also contains the method AeccPipeNetwork.FindShortestNetworkPath for determining the path between two network parts.
To create Network, you should get the networks through AeccPipeDocument firstly, then use add method to create it or use Item method to return it by inputting the name

54. Creating Pipe and Structure
After we get or create the network object, we can create pipe or structure object, before we do this we should return the PartFamilyGuid and PartSizeFilter to prepare for the creation. Just like the following code:
Dim oAeccPipeSettingRoot As AeccPipeSettingsRoot
Set oAeccPipeSettingRoot = g_oAeccPipeDb.Settings
Dim oAeccPartlists As AeccPartLists
Dim oAeccPartlist As AeccPartList
Set oAeccPartlists = oAeccPipeSettingRoot.PartLists
Set oAeccPartlist = oAeccPartlists.Item(0)
Dim oPartFamily As AeccPartFamily
Dim oPipeSizeFilters As AeccPartSizeFilters
Dim oPipeSizeFilter As AeccPartSizeFilter
Dim sPipeGuid As String
For Each oPartFamily In oAeccPartlist
If oPartFamily.Domain = aeccDomPipe Then
If oPartFamily.Name = "Concrete Pipe" Then
sPipeGuid = oPartFamily.GUID
Set oPipeSizeFilter = oPartFamily.SizeFilters.Item(1)
Exit For
End If
Next
Pipe objects represent the conduits of the pipe network. Pipes are created using the pipe network’s AeccPipeNetwork.Pipes collection. This collection has methods for creating either straight or curved pipes. Both methods require you to specify a particular part family (using the GUID of a family) and a particular part size filter object as well as the starting and ending points of the pipe. The order of the start and end points may have meaning in describing flow direction.
Structures represent physical objects such as manholes, catch basins, and headwalls. Logically, structures are used as connections between pipes at pipe endpoints. In cases where two pipes connect directly, an AeccStructure object not representing any physical object is still created to serve as the joint. Any number of pipes can connect with a structure. Structures are represented by objects of type AeccStructure, which are created by using the Add method of the Surfaces collection of AeccPipeNetwork.

55. Create Pipe and Structure
Add a new structure to the network:
Dim oStructure As AeccStructure
Set oStructure = oNetwork.Structures.Add(sStructGuid, oStructSizeFilter, pt0, 1)
‘set the style
Set oStructure.Style = oStructureStyle
Add a new Pipe to the network:
Dim oPipe As AeccPipe
Set oPipe = oNetwork.Pipes.Add(sPipeGuid, oPipeSizeFilter, pt0, pt1)
Set oPipe.Style = oPipeStyle 'connect the pipe to the structure
oPipe.ConnectToStructure aeccPipeStart, oStructure
This slide shows code snippet to 'Add a new structure to the network:' , 'Add a new Pipe to the network:'

56. Pipe and Structure Information
Go through the current drawing to print the main properties of the pipe or structure object information:
Sub outputPipeInfo()
Dim obj As AcadObject
Dim oPipe As AeccPipe
Dim oStructure As AeccStructure
For Each obj In ThisDrawing.ModelSpace
If TypeOf obj Is AeccPipe Then
Set oPipe = obj
ThisDrawing.Utility.Prompt (vbCrLf & "pipe's name:" & oPipe.Name)
ThisDrawing.Utility.Prompt (vbCrLf & "Description:" & oPipe.Description)
ThisDrawing.Utility.Prompt (vbCrLf & "Start point:(" & oPipe.StartPoint.X & "," & oPipe.StartPoint.Y & "," & oPipe.StartPoint.Z & ")")
ThisDrawing.Utility.Prompt (vbCrLf & "End point:(" & oPipe.EndPoint.X & "," & oPipe.EndPoint.Y & "," & oPipe.EndPoint.Z & ")")
Dim dSlope As Double
dSlope = (oPipe.EndPoint.Z - oPipe.StartPoint.Z) / oPipe.Length2D
ThisDrawing.Utility.Prompt (vbCrLf & "Slope :" & dSlope & vbCrLf)
ElseIf TypeOf obj Is AeccStructure Then
Set oStructure = obj
ThisDrawing.Utility.Prompt (vbCrLf & "Structure name:" & oStructure.Name)
ThisDrawing.Utility.Prompt (vbCrLf & "Description:" & oStructure.Description)
ThisDrawing.Utility.Prompt (vbCrLf & "Position:(" & oStructure.Position.X & "," & oStructure.Position.Y & "," & oStructure.Position.Z & ")" & vbCrLf)
End If
Next
End Sub
This slide shows code snippet to extract the Pipe & Structure properties which could be used to a report generation.

57. Pipe and Structure Styles
New Objects in Civil 3D 2008 :
AeccPipeNetworkLabelStyles
AeccPipeLabelStyles
AeccStructureLabelStyles
New!
The following three objects have been added to 2008: AeccPipeNetworkLabelStyles, AeccPipeLabelStyles, and AeccStructureLabelStyles.

58. Custom Draw API
A C++ API used to enhance / supplant existing graphics for customized display
Used in Object ARX context
No proxy objects / no object enablers involved
CustomDraw Sample available at –
<AutoCAD Civil 3D 2008 Installation Folder>\Sample\Civil 3D API\VC++\CustomDraw
A C++ API used to enhance / supplant existing graphics for customized display.

59. Custom Draw API How it works -
One or more user-implemented callback functions are registered when application is initialized, e.g.
AeccCustomDraw.setAlignmentDraw(AlignmentCallbackFunction)
During object draw, the callback function is called with an interface pointer for the object as well as an anonymous block
bool AlignmentCallbackFunction(const AeccDisplayOrientation &viewMode, IAeccAlignment *pAlign, IAcadBlock *pAnonymousBlock ) {
//// }
Return true, if you want Civil 3D to draw the block, false otherwise
Using the object you calculate the graphics to draw an add them to the anonymous block (instead of Modelspace)
Block is returned to the object, and added to the graphics stream
New graphics are part of the object for the display
Principle ---
One or more user-implemented callback functions are registered when application is initialized, e.g. AeccCustomDraw.setAlignmentDraw(AlignmentCallbackFunction)
During object draw, the callback function is called with an interface pointer for the object as well as an anonymous block -
bool AlignmentCallbackFunction(const AeccDisplayOrientation &viewMode, IAeccAlignment *pAlign, IAcadBlock *pAnonymousBlock ) {
//viewMode: specifies the current view orientation.
//pAlign: Pointer to the COM interface to the alignment being drawn.
//pAnonymousBlock: Pointer to the anonymous block containing custom graphics that you want drawn with the alignment. }
Return true, if you want Civil 3D to draw the block, false otherwise
Using the object you calculate the graphics to draw an add them to the anonymous block (instead of Modelspace)
Block is returned to the object, and added to the graphics stream
New graphics are part of the object for the display
Procedure -
Build an ARX-application that links with the AeccCustomDrawNN.lib library (NN is the Civil 3D module version number)
Include the header file (AeccCustomDraw.h) as necessary. Typically at C:\Program Files\Autodesk Civil 3D 2006\Sample\Civil 3D API\Vc++\CustomDraw\Inc
In the application's acrxEntryPoint function, declare a static instance of an AeccCustomDraw object.
When the AcRx::kInitAppMsg message is received, register one or more draw callbacks using the appropriate method(s) on the AeccCustomDraw object.
When the AcRx::kUnloadAppMsg message is received, be sure to unregister your app's callbacks using the clearAll() method on the AeccCustomDraw object
When one of your application's callbacks is called during the draw of a Civil 3D object, you can add data to be drawn with the object by using the various Add methods on the IAcadObject interface for the anonymous block that is passed to the callback
Your callback will also receive an interface pointer for the object that is currently being drawn. Use the read-only methods on the received IAeccXXX interface to read data about the object to help in your draw. Do NOT attempt to write to the IAeccXXX interface
Finally, have your callback return true if you want Civil 3D to draw the contents of the anonymous block and false if you don't

60. .NET Subassemblies
New!
The default subassemblies included with Civil 3D 2008 are now created using .NET framework.
The default subassemblies included with Civil 3D 2008 are now created using .NET framework.

61. .NET Subassemblies
New!
To maintain backward compatibility, VBA subassemblies are also supported in Civil 3D 2008.
Civil 3D 2008 includes a Utility to convert VBA Subassemblies to .NET
To maintain backward compatibility, VBA subassemblies are also supported in Civil 3D 2008.
Civil 3D 2008 includes a Utility to convert VBA Subassemblies to .NET

62. Designing Subassemblies (.NET)
Detailed information about these requirements of designing
custom subassemblies are available in Civil 3D 2008 Developer’s
Guide topic – “Designing Custom Subassemblies”.
When you plan to design Custom Subassemblies, there are certain steps you will have to follow which include - Naming Custom Subassemblies, Attachment and Insertion.....
Most subassembly components have a single point of attachment and extend in one direction or the other from that point. However, there are some exceptions to this general rule.
Determine which of the geometric dimensions, behavior, and methodology will be hard-coded into the subassembly, and which will be controlled by user-defined input parameters.

63. Creating Subassemblies Help Files
You can provide detailed construction and behavior information of
Custom Subassembly in a Help file. The same help file can be displayed
in AutoCAD Civil 3D using any of the following methods:
From a Tool Palette - Right-click a subassembly in a tool palette, then click Help.
From a Tool Catalog - Right-click a subassembly in a tool catalog, then click Help.
From the Subassembly Properties dialog box Parameters tab - Right-click a subassembly in the Prospector tree, then click Properties Parameters tab Subassembly Help.
You can use any type of document file (.dwf, .doc, .pdf, .txt, .chm, .hlp)
to create the subassembly help file. For more information, see Creating
Customized Help in the AutoCAD Developer Help.
The help file content and style should be similar to that in the AutoCAD Civil 3D Corridor Modeling subassembly help.
Refer to Help file topic 'Creating Subassembly Help Files' which discusses the sections that should be included, as a minimum, in subassembly help files. This information is required so that users understand the subassembly behavior and intended use.

64. Structure of Subassembly (.NET)
The Subassembly Template (SATemplate.vb)
The Corridor State Object
Support Files (CodeSpecific.vb, Utility.vb)
There are three important aspect we need to understand when we talk about the structure of a subassembly OR a custom subassembly.

65. Subassembly Template (SATemplate.vb)
New!
All custom subassemblies are defined as classes that inherit
from the SATemplate class. SATemplate provides four methods
which you can override in your own class to provide
functionality of your subassembly.
Descriptions of these overrideable Methods are listed in this table (refer to Help file).
SATemplate.vb is located in the <AutoCAD Civil 3D installation directory>\Sample\Civil 3D API\C3DSubAssemblies\Subassemblies directory.

66. Corridor State Object
The CorridorState object is the primary interface between the custom
subassembly and the collection of points, links, and shapes of the
current assembly which the subassembly is to connect to.
The CorridorState methods provide useful calculation functions
for corridor design. These include the following:
A reference to an object of type CorridorState is passed to each of the SATemplate methods you override. The CorridorState object is the primary interface between the custom subassembly and the collection of points, links, and shapes of the current assembly which the subassembly is to connect to. It provides referenes to the current alignment, profile, station, offset, elevation, and style, which may affect the appearance of the subassembly. It also includes several parameter buckets used for collecting parameters of types boolean, long, double, string, alignment, profile, surface, and point. Each parameter is defined by a literal name and a value.

67. Support Files (CodeSpecific.vb, Utility.vb)
You can also use the two support files CodeSpecific.vb and Utility.vb in your
subassembly.
CodeSpecific.vb provides the CodeType and AllCodes structures and the
global variable Code - an instance of an AllCodes structure with all code
information filled.
Utility.vb provides a series of shared helper functions for error handling,
computing subassembly geometry, attaching code strings, and other tasks.
For example, to report a “parameter not found” error to the Civil event viewer,
use the following line:
Utilities.RecordError(corridorState, CorridorError.ParameterNotFound, "Edge Offset", "BasicLaneTransition")
CodeSpecific.vb provides the CodeType and AllCodes structures and the global variable Code - an instance of an AllCodes structure with all code information filled.
Utility.vb provides a series of shared helper functions for error handling, computing subassembly geometry, attaching code strings, and other tasks. For example, to report a “parameter not found” error to the Civil event viewer, use the following line:
Utilities.RecordError(corridorState, CorridorError.ParameterNotFound, "Edge Offset", "BasicLaneTransition")

68. Sample VB.NET Subassembly
New!
Imports System.Math
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.Civil.Corridor
Imports Autodesk.Civil
Imports Autodesk.Civil.Alignment
Imports Autodesk.Civil.Profile
Imports Shape = Autodesk.Civil.Corridor.Shape
Imports DBTransactionManager =
Autodesk.AutoCAD.DatabaseServices.TransactionManager
.NET source code of subassemblies available at - C:\Documents and
Settings\All Users\Application Data\Autodesk\C3D 2008\enu\Sample\Civil 3D
API\C3DstockSubAssemblies
Lists of Interfaces we need to import to work on custom subassemblies.

69. Custom Subassemblies - Installation
Copy the compiled subassembly .dll library to its destination directory. By default, libraries are located in C:\Program Files\Autodesk Civil 3D 2008\Data\Models.
Copy the tool catalog .atc files to its destination directory. The tool catalog files are normally located in the C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2007\enu\Tool Catalogs directory.
Copy optional files such as the image file representing the subassemblies or the help file to their destination directory.
Copy the catalog cover page .html file to its destination. Usually this is the same location as the .atc file, although it can be any directory as long as the .atc file has the correct relative path information.
Register the tool catalog using a registry (.reg) file. This .reg file must have the correct paths to the .atc file and the catalog image file from steps 2) and 3).
Images are normally located in C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2007\enu\Tool Catalogs\Images, and help files are normally located in C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2007\enu\Tool Catalogs\Help, although these can be any directory as long as the .atc file has the correct relative path information. For information on creating help files, see Creating Subassembly Help Files

70. Developer Resources Civil 3D API Help file
Code Samples provided with Product installation at - C:\Program Files\Autodesk Civil 3D 2008\Sample\Civil 3D API
ADN site & Devnotes
Civil 3D site
List of the places where Civil 3D API resources are available.

71. Thank You