HELP ME .. 2d Area FOR VOLUME SURFACE USING C#

[hosneyalaa]

Hello all
Please get help 2d Area From volume surface

I GET total cut volume  AND total FILL volume  FROM LINK

http://docs.autodesk.com/CIV3D/2019/ENU/API_Reference_Guide/html/3ccfb05b-56ef-dcfe-d13b-1661a96ccd5...

BUT I AM NEED 2D AREA 

HOW  IS THAT PLEASE

http://docs.autodesk.com/CIV3D/2019/ENU/API_Reference_Guide/html/56bd45f8-92ce-c1ac-34d0-b63e46947f7...

// Create the surface
                    ObjectId surfaceId = TinVolumeSurface.Create(surfaceName, baseId, comparisonId);
                    TinVolumeSurface surface = surfaceId.GetObject(OpenMode.ForWrite) as TinVolumeSurface;
                    surface.Rebuild();

 DVG1.Rows.Add(surface.Name, surface., surface.GetVolumeProperties().AdjustedCutVolume.ToString(), surface.GetVolumeProperties().AdjustedFillVolume.ToString());

[Jeff_M · Accepted solution]

That property is not exposed. Nor can we get the triangles to calculate it ourselves.

[hosneyalaa]

HI @Jeff_M 

Do the solution extract the outer Boundare  of the surface as polyline 

And calculate its area

[Jeff_M]

The TinVolumeSurface object does not have the ExtractBorder() method that the TinSurface has.

[Civil3DReminders_com · Accepted solution]

One can create a new TIN surface (temporary) and then paste the TIN Volume Surface into it and then get access to the desired information. This works in a timely manner if the surfaces are not large.

http://docs.autodesk.com/CIV3D/2016/ENU/API_Reference_Guide/html/329508c0-2e0e-5cb6-1279-64666ec5a92...

http://docs.autodesk.com/CIV3D/2016/ENU/API_Reference_Guide/html/2a0de7f5-7b00-1475-e392-ed6ca2d09e0...

[hosneyalaa]

@Civil3DReminders_com 

Thank you so much

This is Good Idea thank you

[gleeuwdrent · Accepted solution]

You could also use the COM representation of the TinVolumeSurfaceClass. In COM the 2d Area property is exposed:

dynamic comVolumeSurface= volumeSurface.AcadObject; // get the COM representation

double area = comVolumeSurface.Statistics.Area2d;

[hosneyalaa]

hi @gleeuwdrent 

I am a beginner with a language .net 
When I put in the code it gave me this image
Is it possible how to write the code completely without a mistake from me
So get the 2d Area
Thanks in advance

// Create the surface
                    ObjectId surfaceId = TinVolumeSurface.Create(surfaceName, baseId, comparisonId);
                    TinVolumeSurface surface = surfaceId.GetObject(OpenMode.ForWrite) as TinVolumeSurface;
                    surface.Rebuild();
 

dynamic comVolumeSurface= volumeSurface.AcadObject; // get the COM representation

double area = comVolumeSurface.Statistics.Area2d;



 DVG1.Rows.Add(surface.Name, area , surface.GetVolumeProperties().AdjustedCutVolume.ToString(), surface.GetVolumeProperties().AdjustedFillVolume.ToString());

[hosneyalaa]

[gleeuwdrent]

Oops, I looked wrong in the API, the mentioned 

Statistics.Area2d;

property belongs to TinSurface, not to TinVolumeSurface. Even in COM the 2d area isn't exposed.

You could build a method yourself by iterating trough all the triangles and summarize areas. This link gives you a good starting point.

[hosneyalaa]

tankyou @gleeuwdrent 

[Jeff_M · Accepted solution]

Rather than looping through all of the triangles, just get the Border from the COM object:

            var doc = Application.DocumentManager.MdiActiveDocument;
            var ids = CivilApplication.ActiveDocument.GetSurfaceIds();
            using (Transaction tr = doc.Database.TransactionManager.StartTransaction())
            {
                foreach (ObjectId obj in ids)
                {
                    var surf = tr.GetObject(obj, OpenMode.ForRead) as TinVolumeSurface;
                    if (surf == null || !surf.IsVolumeSurface)
                        continue;
                    var layname = surf.Layer;
                    dynamic volsurf = surf.AcadObject;
                    ObjectId plineId = AcDb.DBObject.FromAcadObject(volsurf.ExtractBorder(1)[0]);//1 is the Plan Display orientation type
                    var pline = (Polyline3d)tr.GetObject(plineId, OpenMode.ForRead);
                    var crv = pline.GetOrthoProjectedCurve(new Plane(new Point3d(0, 0, 0), Vector3d.ZAxis));
                    var area = crv.Area;
                    doc.Editor.WriteMessage("\n{0} area: {1}", surf.Name, area.ToString("F2"));
                }
            }

[vucic_tamara]

I believe this is the way to get Area2D from TinVolumeSurface object:

tinVolume.GetTerrainProperties().SurfaceArea2D

[vucic_tamara]

Actually no, there is no such property on TinVolumeSurface, only on TinSurface object. My mistake.

[Civil3DReminders_com]

One can create a temporary TIN Surface, paste in the Volume Surface into it, get the property, and then delete the temporary surface. I haven't seen it take a long time for Civil 3D to do, but I haven't tried it on super large surfaces.