Civil 3D 2013利用API把三角网曲面提取为栅格网

最新推荐文章于 2020-11-23 18:55:06 发布

转载最新推荐文章于 2020-11-23 18:55:06 发布 · 450 阅读

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#数据库

本文介绍如何使用Civil3D2013的.NET API从三角网曲面中提取三维栅格网。通过示例代码演示了如何选择一个三角网表面并从中提取由红色三维多段线构成的栅格网。

Civil 3D 2013中对曲面的.net API做了增强，可以让我们从三角网曲面中提取栅格网。先看看效果：

下面的代码演示了从一个三角网曲面中提取三维栅格网，这些栅格网是由红色是三维多段线polyline构成的。

//
using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.Civil.DatabaseServices;
using Autodesk.Civil;

// This line is not mandatory, but improves loading performances
[assembly: CommandClass(typeof(SurfaceApiInCivil3D2013.MyCommands))]

namespace SurfaceApiInCivil3D2013
{

    // This class is instantiated by AutoCAD for each document when
    // a command is called by the user the first time in the context
    // of a given document. In other words, non static data in this class
    // is implicitly per-document!
    public class MyCommands
    {
        static Document _doc = Application.DocumentManager.MdiActiveDocument;
        static Editor _editor = _doc.Editor;
        static Database db = _doc.Database;

        private ObjectId promptForTinSurface()
        {
            PromptEntityOptions options = new PromptEntityOptions(
                "\nSelect a TIN Surface: ");
            options.SetRejectMessage(
                "\nThe selected object is not a TIN Surface.");
            options.AddAllowedClass(typeof(TinSurface), true);

            PromptEntityResult result = _editor.GetEntity(options);
            if (result.Status == PromptStatus.OK)
            {
                // Everything is cool; we return the selected
                // surface ObjectId.
                return result.ObjectId;
            }
            return ObjectId.Null;   // Indicating error.
        }

        [CommandMethod("CDS_ExtractGrid")]
        public void CDS_ExtractGrid()
        {
            ObjectId surfaceId = promptForTinSurface();
            if (surfaceId == ObjectId.Null)
            {
                _editor.WriteMessage("\nNo TIN Surface selected.");
                return;
            }

            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                TinSurface surface = surfaceId.GetObject(OpenMode.ForRead)
                    as TinSurface;
                ObjectIdCollection ids = surface.ExtractGridded(
                    SurfaceExtractionSettingsType.Model);

                foreach (ObjectId id in ids)
                {
                    Polyline3d polyline =
                        id.GetObject(OpenMode.ForWrite) as Polyline3d;
                    if (polyline != null)
                    {
                        using (polyline)
                        {
                            polyline.Color =
                                Autodesk.AutoCAD.Colors.Color.FromRgb(255, 0, 0);
                        }
                    }
                }
                tr.Commit();
            }
        }


    }

}

想了解更多Civil 3D 2013 API，请看Civilized Development博客中的21WOJP系列 （21 Week Of JayPeak）, JayPeak是Civil 3D 2013的代码名。