By Adam Nagy
If you only have faces to work with, but need to create a solid from them then you can use SurfaceBodyDefinition and its CreateTransientSurfaceBody to assemble them into a solid body.
The API help file has a nice VBA sample for it:
Public Sub CreateBlock()
Dim oTransBRep As TransientBRep
Set oTransBRep = ThisApplication.TransientBRep
Dim oSurfaceBodyDef As SurfaceBodyDefinition
Set oSurfaceBodyDef = oTransBRep.CreateSurfaceBodyDefinition
Dim oTG As TransientGeometry
Set oTG = ThisApplication.TransientGeometry
' Create a lump.
Dim oLumpDef As LumpDefinition
Set oLumpDef = oSurfaceBodyDef.LumpDefinitions.Add' Create a shell.
Dim oShell As FaceShellDefinition
Set oShell = oLumpDef.FaceShellDefinitions.Add' Define the six planes of the box.
Dim oPosX As Plane
Dim oNegX As Plane
Dim oPosY As Plane
Dim oNegY As Plane
Dim oPosZ As Plane
Dim oNegZ As Plane
Set oPosX = oTG.CreatePlane( _
oTG.CreatePoint(1, 0, 0), oTG.CreateVector(1, 0, 0))
Set oNegX = oTG.CreatePlane( _
oTG.CreatePoint(-1, 0, 0), oTG.CreateVector(-1, 0, 0))
Set oPosY = oTG.CreatePlane( _
oTG.CreatePoint(0, 1, 0), oTG.CreateVector(0, 1, 0))
Set oNegY = oTG.CreatePlane( _
oTG.CreatePoint(0, -1, 0), oTG.CreateVector(0, -1, 0))
Set oPosZ = oTG.CreatePlane( _
oTG.CreatePoint(0, 0, 1), oTG.CreateVector(0, 0, 1))
Set oNegZ = oTG.CreatePlane( _
oTG.CreatePoint(0, 0, -1), oTG.CreateVector(0, 0, -1))' Create the six faces.
Dim oFaceDefinitions As FaceDefinitions
Set oFaceDefinitions = oShell.FaceDefinitions
Dim oFaceDefPosX As FaceDefinition
Dim oFaceDefNegX As FaceDefinition
Dim oFaceDefPosY As FaceDefinition
Dim oFaceDefNegY As FaceDefinition
Dim oFaceDefPosZ As FaceDefinition
Dim oFaceDefNegZ As FaceDefinition
Set oFaceDefPosX = oFaceDefinitions.Add(oPosX, False)
Set oFaceDefNegX = oFaceDefinitions.Add(oNegX, False)
Set oFaceDefPosY = oFaceDefinitions.Add(oPosY, False)
Set oFaceDefNegY = oFaceDefinitions.Add(oNegY, False)
Set oFaceDefPosZ = oFaceDefinitions.Add(oPosZ, False)
Set oFaceDefNegZ = oFaceDefinitions.Add(oNegZ, False)' Create the vertices.
Dim oVertexDefinitions As VertexDefinitions
Set oVertexDefinitions = oSurfaceBodyDef.VertexDefinitions
Dim oVertex1 As VertexDefinition
Dim oVertex2 As VertexDefinition
Dim oVertex3 As VertexDefinition
Dim oVertex4 As VertexDefinition
Dim oVertex5 As VertexDefinition
Dim oVertex6 As VertexDefinition
Dim oVertex7 As VertexDefinition
Dim oVertex8 As VertexDefinition
Set oVertex1 = oVertexDefinitions.Add(oTG.CreatePoint(1, 1, 1))
Set oVertex2 = oVertexDefinitions.Add(oTG.CreatePoint(1, 1, -1))
Set oVertex3 = oVertexDefinitions.Add(oTG.CreatePoint(-1, 1, -1))
Set oVertex4 = oVertexDefinitions.Add(oTG.CreatePoint(-1, 1, 1))
Set oVertex5 = oVertexDefinitions.Add(oTG.CreatePoint(1, -1, 1))
Set oVertex6 = oVertexDefinitions.Add(oTG.CreatePoint(1, -1, -1))
Set oVertex7 = oVertexDefinitions.Add(oTG.CreatePoint(-1, -1, -1))
Set oVertex8 = oVertexDefinitions.Add(oTG.CreatePoint(-1, -1, 1))' Define the edges at intersections of the defined planes.
Dim oEdgeDefinitions As EdgeDefinitions
Set oEdgeDefinitions = oSurfaceBodyDef.EdgeDefinitions
Dim oEdgeDefPosXPosY As EdgeDefinition
Dim oEdgeDefPosXNegZ As EdgeDefinition
Dim oEdgeDefPosXNegY As EdgeDefinition
Dim oEdgeDefPosXPosZ As EdgeDefinition
Dim oEdgeDefNegXPosY As EdgeDefinition
Dim oEdgeDefNegXNegZ As EdgeDefinition
Dim oEdgeDefNegXNegY As EdgeDefinition
Dim oEdgeDefNegXPosZ As EdgeDefinition
Dim oEdgeDefPosYNegZ As EdgeDefinition
Dim oEdgeDefPosYPosZ As EdgeDefinition
Dim oEdgeDefNegYNegZ As EdgeDefinition
Dim oEdgeDefNegYPosZ As EdgeDefinition
Set oEdgeDefPosXPosY = oEdgeDefinitions.Add( _
oVertex1, oVertex2, oTG.CreateLineSegment( _
oVertex1.Position, oVertex2.Position))
Set oEdgeDefPosXNegZ = oEdgeDefinitions.Add( _
oVertex2, oVertex6, oTG.CreateLineSegment( _
oVertex2.Position, oVertex6.Position))
Set oEdgeDefPosXNegY = oEdgeDefinitions.Add( _
oVertex6, oVertex5, oTG.CreateLineSegment( _
oVertex6.Position, oVertex5.Position))
Set oEdgeDefPosXPosZ = oEdgeDefinitions.Add( _
oVertex5, oVertex1, oTG.CreateLineSegment( _
oVertex5.Position, oVertex1.Position))
Set oEdgeDefNegXPosY = oEdgeDefinitions.Add( _
oVertex4, oVertex3, oTG.CreateLineSegment( _
oVertex4.Position, oVertex3.Position))
Set oEdgeDefNegXNegZ = oEdgeDefinitions.Add( _
oVertex3, oVertex7, oTG.CreateLineSegment( _
oVertex3.Position, oVertex7.Position))
Set oEdgeDefNegXNegY = oEdgeDefinitions.Add( _
oVertex7, oVertex8, oTG.CreateLineSegment( _
oVertex7.Position, oVertex8.Position))
Set oEdgeDefNegXPosZ = oEdgeDefinitions.Add( _
oVertex8, oVertex4, oTG.CreateLineSegment( _
oVertex8.Position, oVertex4.Position))
Set oEdgeDefPosYNegZ = oEdgeDefinitions.Add( _
oVertex2, oVertex3, oTG.CreateLineSegment( _
oVertex2.Position, oVertex3.Position))
Set oEdgeDefPosYPosZ = oEdgeDefinitions.Add( _
oVertex4, oVertex1, oTG.CreateLineSegment( _
oVertex4.Position, oVertex1.Position))
Set oEdgeDefNegYNegZ = oEdgeDefinitions.Add( _
oVertex7, oVertex6, oTG.CreateLineSegment( _
oVertex7.Position, oVertex6.Position))
Set oEdgeDefNegYPosZ = oEdgeDefinitions.Add( _
oVertex5, oVertex8, oTG.CreateLineSegment( _
oVertex5.Position, oVertex8.Position))' Define the loops on the faces.
Dim oPosXLoop As EdgeLoopDefinition
Set oPosXLoop = oFaceDefPosX.EdgeLoopDefinitions.Add
Call oPosXLoop.EdgeUseDefinitions.Add(oEdgeDefPosXPosY, True)
Call oPosXLoop.EdgeUseDefinitions.Add(oEdgeDefPosXNegZ, True)
Call oPosXLoop.EdgeUseDefinitions.Add(oEdgeDefPosXNegY, True)
Call oPosXLoop.EdgeUseDefinitions.Add(oEdgeDefPosXPosZ, True)
Dim oNegXLoop As EdgeLoopDefinition
Set oNegXLoop = oFaceDefNegX.EdgeLoopDefinitions.Add
Call oNegXLoop.EdgeUseDefinitions.Add(oEdgeDefNegXPosY, False)
Call oNegXLoop.EdgeUseDefinitions.Add(oEdgeDefNegXNegZ, False)
Call oNegXLoop.EdgeUseDefinitions.Add(oEdgeDefNegXNegY, False)
Call oNegXLoop.EdgeUseDefinitions.Add(oEdgeDefNegXPosZ, False)
Dim oPosYLoop As EdgeLoopDefinition
Set oPosYLoop = oFaceDefPosY.EdgeLoopDefinitions.Add
Call oPosYLoop.EdgeUseDefinitions.Add(oEdgeDefPosXPosY, False)
Call oPosYLoop.EdgeUseDefinitions.Add(oEdgeDefPosYNegZ, False)
Call oPosYLoop.EdgeUseDefinitions.Add(oEdgeDefNegXPosY, True)
Call oPosYLoop.EdgeUseDefinitions.Add(oEdgeDefPosYPosZ, False)
Dim oNegYLoop As EdgeLoopDefinition
Set oNegYLoop = oFaceDefNegY.EdgeLoopDefinitions.Add
Call oNegYLoop.EdgeUseDefinitions.Add(oEdgeDefPosXNegY, False)
Call oNegYLoop.EdgeUseDefinitions.Add(oEdgeDefNegYPosZ, False)
Call oNegYLoop.EdgeUseDefinitions.Add(oEdgeDefNegXNegY, True)
Call oNegYLoop.EdgeUseDefinitions.Add(oEdgeDefNegYNegZ, False)
Dim oPosZLoop As EdgeLoopDefinition
Set oPosZLoop = oFaceDefPosZ.EdgeLoopDefinitions.Add
Call oPosZLoop.EdgeUseDefinitions.Add(oEdgeDefNegXPosZ, True)
Call oPosZLoop.EdgeUseDefinitions.Add(oEdgeDefNegYPosZ, True)
Call oPosZLoop.EdgeUseDefinitions.Add(oEdgeDefPosXPosZ, False)
Call oPosZLoop.EdgeUseDefinitions.Add(oEdgeDefPosYPosZ, True)
Dim oNegZLoop As EdgeLoopDefinition
Set oNegZLoop = oFaceDefNegZ.EdgeLoopDefinitions.Add
Call oNegZLoop.EdgeUseDefinitions.Add(oEdgeDefNegXNegZ, True)
Call oNegZLoop.EdgeUseDefinitions.Add(oEdgeDefNegYNegZ, True)
Call oNegZLoop.EdgeUseDefinitions.Add(oEdgeDefPosXNegZ, False)
Call oNegZLoop.EdgeUseDefinitions.Add(oEdgeDefPosYNegZ, True)
' Create a transient surface body.
Dim oErrors As NameValueMap
Dim oNewBody As SurfaceBody
Set oNewBody = oSurfaceBodyDef.CreateTransientSurfaceBody(oErrors)' Create client graphics to display the transient body.
Dim oDoc As PartDocument
Set oDoc = ThisApplication.Documents.Add(kPartDocumentObject)
Dim oDef As PartComponentDefinition
Set oDef = oDoc.ComponentDefinition
Dim oClientGraphics As ClientGraphics
Set oClientGraphics = oDef.ClientGraphicsCollection.Add( _
"Sample3DGraphicsID")' Create a new graphics node within the client graphics objects.
Dim oSurfacesNode As GraphicsNode
Set oSurfacesNode = oClientGraphics.AddNode(1)' Create client graphics based on the transient body
Dim oSurfaceGraphics As SurfaceGraphics
Set oSurfaceGraphics = oSurfacesNode.AddSurfaceGraphics(oNewBody)' Update the view.
ThisApplication.ActiveView.Update
End SubThe result: