xBIM 基础16 IFC的空间层次结构

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本篇介绍如何从文件中检索空间结构。IFC中的空间结构表示层次结构的嵌套结构，表示项目，站点，建筑物，楼层和空间。如果您查看IFC文档， 您会发现建筑物可以包含楼层以及其他建筑物，楼层可以包含空间以及其他楼层等。此类关系也使用IfcRelAggregates建模， 但如果要查找特定空间结构中包含的元素，则将其建模为 IfcRelContainedInSpatialStructure， 因此它取决于您要查找的内容。下面的示例演示如何使用上述两种关系搜索和遍历数据以获得完整的层次结构。

using System;
using System.Linq;
using Xbim.Ifc;
using Xbim.Ifc4.Interfaces;

namespace BasicExamples
{
    class SpatialStructureExample
    {
        public static void Show()
        {
            const string file = "SampleHouse.ifc";

            using (var model = IfcStore.Open(file))
            {
                var project = model.Instances.FirstOrDefault<IIfcProject>();
                PrintHierarchy(project, 0);
            }
        }

        private static void PrintHierarchy(IIfcObjectDefinition o, int level)
        {
            Console.WriteLine(string.Format("{0}{1} [{2}]", GetIndent(level), o.Name, o.GetType().Name));

            // 只有空间元素可以包含建筑元素
            var spatialElement = o as IIfcSpatialStructureElement;
            if (spatialElement != null)
            {
                // 使用 IfcRelContainedInSpatialElement 获取包含的元素
                var containedElements = spatialElement.ContainsElements.SelectMany(rel => rel.RelatedElements);
                foreach (var element in containedElements)
                    Console.WriteLine(string.Format("{0}    ->{1} [{2}]", GetIndent(level), element.Name, element.GetType().Name));
            }

            // 使用 IfcRelAggregares 获取空间结构元素的空间分解
            foreach (var item in o.IsDecomposedBy.SelectMany(r => r.RelatedObjects))
                PrintHierarchy(item, level +1);
        }

        private static string GetIndent(int level)
        {
            var indent = "";
            for (int i = 0; i < level; i++)
                indent += "  ";
            return indent;
        }
    }
}

输出结果如下：

Project Number [IfcProject]
  Default [IfcSite]
     [IfcBuilding]
      Ground Floor [IfcBuildingStorey]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285330 [IfcWall]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285395 [IfcWall]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285459 [IfcWall]
          ->Curtain Wall:Curtain_Wall-Exterior_Glazing:285582 [IfcCurtainWall]
          ->Curtain Wall:Curtain_Wall-Exterior_Glazing:285684 [IfcCurtainWall]
          ->Basic Wall:Wall-Partn_12P-70MStd-12P:285792 [IfcWallStandardCase]
          ->Basic Wall:Wall-Partn_12P-70MStd-12P:285846 [IfcWallStandardCase]
          ->Doors_ExtDbl_Flush:1810x2110mm:285860 [IfcDoor]
          ->Doors_IntSgl:810x2110mm:285959 [IfcDoor]
          ->Doors_IntSgl:810x2110mm:285996 [IfcDoor]
          ->Windows_Sgl_Plain:1810x1210mm:286105 [IfcWindow]
          ->Windows_Sgl_Plain:1810x1210mm:286188 [IfcWindow]
          ->Windows_Sgl_Plain:1810x1210mm:286238 [IfcWindow]
          ->Compound Ceiling:Plain:286319 [IfcCovering]
          ->Compound Ceiling:Plain:286329 [IfcCovering]
          ->Compound Ceiling:Plain:286337 [IfcCovering]
          ->Floor:Floor-Grnd-Susp_65Scr-80Ins-100Blk-75PC:286349 [IfcSlab]
          ->Windows_Sgl_Plain:1810x1210mm:287567 [IfcWindow]
        1 - Living room [IfcSpace]
            ->Furniture_Table_Dining_w-Chairs_Rectangular:2000x1000x750mm_w-6_Seats:289768 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289769 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289770 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289771 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289772 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:290097 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:290098 [IfcFurniture]
            ->Furniture_Couch_Viper:2290x950x340mm:290852 [IfcFurniture]
            ->Furniture_Chair_Viper:1120x940x350mm:291916 [IfcFurniture]
            ->Furniture_Chair_Viper:1120x940x350mm:292127 [IfcFurniture]
            ->Furniture_Table_Coffee_1:1200x550x450mm:293046 [IfcFurniture]
            ->Furniture_Piano:1370x600x1170mm:293961 [IfcFurniture]
        2 - Bedroom [IfcSpace]
            ->Furniture_Desk:1525x762mm:287689 [IfcFurniture]
            ->Furniture_Bed_1:1525x2007x355mm-Queen:295878 [IfcFurniture]
        3 - Entrance hall [IfcSpace]
      Roof [IfcBuildingStorey]
          ->Basic Roof:Roof_Flat-4Felt-150Ins-50Scr-150Conc-12Plr:286419 [IfcRoof]
          ->Floor:Simple floor:295048 [IfcSlab]
        4 - Roof [IfcSpace]

 

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