topic Re: Extract Contours from Surface using from external application in Civil 3D Customization Forum

Extract Contours from Surface using from external application

CaoduroC — Tue, 20 Nov 2018 23:22:38 GMT

Good morning,

I'm struggling trying to extract contours from an external application (Grasshopper node) using the AECC interface.

AeccTinSurface tinSurf = surface._Surface as AeccTinSurface;

            dynamic surfContours = tinSurf.ExtractContour(
                AeccDisplayOrientation.aeccDisplayOrientationPlan,
                AeccSurfaceFilterType.aeccSFMajorContours,
                tinSurf.Statistics.MinElevation,
                tinSurf.Statistics.MaxElevation
                );
            double surfcontnum = surfContours.Length;
            List<object> crvs = new List<object>();

            for (int i = 0; i < surfContours.Length; i++)
            {
                dynamic pL = surfContours[i];
                Type pInfo = pL.GetType();
                crvs.Add(pInfo);
            }

This code results in a list of System.__COMObject. In all other cases like ALignments and profile I'm able to cast to a specific type but not in this case.

Does anyone have an explanation or some idea regarding this?

Cheers,

Cesare

Re: Extract Contours from Surface using from external application

CaoduroC — Wed, 21 Nov 2018 06:14:13 GMT

Of course if there is any better or more clever way to deal with Civil 3D native object from an external application, rather than using COM objects, that will be perfect!

Re: Extract Contours from Surface using from external application

augusto.goncalves — Mon, 26 Nov 2018 20:49:36 GMT

COM is the way to interact from out-of-process, but you can expose .NET through COM (a bit more complicated).

In this case, I believe the ExtractCountours should return a list of Objects, so at the higher level, an AcadObject (which can be anything on the drawing)

Re: Extract Contours from Surface using from external application

CaoduroC — Mon, 26 Nov 2018 21:24:34 GMT

I've extracted the object for many other things but in this case, I can't really cast to any kind of object in Rhino or Dynamo.
I can see that is a polyline CAD Object but keeps giving me the same error.

Re: Extract Contours from Surface using from external application

CaoduroC — Thu, 29 Nov 2018 00:22:49 GMT

That's exactly the way I'm extracting all other object from a civil 3d active document. Only contours are not working!

I can see that they're polylines in the CAD environment but I can't cast them to anything.

Can you help me with a code sample?

Cheers,

Cesare

Re: Extract Contours from Surface using from external application

ChrisRS — Sat, 26 Jan 2019 03:06:02 GMT

I am not familiar with the tools you are using or customization, but here is a thought:

Contours are not Civl 3D objects. They are a graphic representation of a Civil 3D Surface object. That representation is generated as needed. They only look like polylines. You can extract contours from a surface using SURFACEEXTRACTOBJECTS. The extracted "contours" are polylines. (3D)

Programmatically I think your would needs to first extract the contours, from a surface, to polylines, then extract the resulting polylines.

SURFACEEXTRACTOBJECTS first prompts for a surface then displays a dialog box where you can pick what displayed objects to extract.

Unfortunately, the dialog box does seems to be set up for mouse navigation/selection only. The surface style display option controls which object are available for extraction. (e.g. If Border is not displayed in the style, it will not bwe displayed and it will not be available for extraction.)

Hope this helps. Good Luck!

回复： Extract Contours from Surface using from external application

465340553 — Thu, 11 Jun 2020 08:14:28 GMT

Have you solved this problem?

If it has been solved，

Can you share your solution?

回复： Extract Contours from Surface using from external application

465340553 — Thu, 11 Jun 2020 23:40:40 GMT

My problem is solved like this：

I cast contour to acadlwpolyline。

AeccTinVolumeSurface aeccTVS = _comDoc.ObjectIdToObject((volumeSurfaceId.OldIdPtr).ToInt64()) as AeccTinVolumeSurface; IEnumerable contours = aeccTVS.ExtractContour(AeccDisplayOrientation.aeccDisplayOrientationPlan, AeccSurfaceFilterType.aeccSFMajorContours, 0, 0) as IEnumerable; List<Point2dCollection> ptss = new List<Point2dCollection>(); foreach (var contour in contours) { AcadLWPolyline pl = contour as AcadLWPolyline; if (pl != null) { Point2dCollection pts = new Point2dCollection(); double[] cors= pl.Coordinates as double[]; for (int i = 0; i < cors.Length - 2; i += 2) { pts.Add(new Point2d(cors[i], cors[i+1])); } ptss.Add(pts); pl.Delete(); } }