附录E示例-LinearPlacement_1

示例概述

意图

此场景是沿路线曲线进行局部和线性放置的示例。IfcLinerPlacement定义了依赖于引用空间曲线（通常是IfcAlignmentCurve）的空间点。欧几里德坐标可以根据给定的路线曲线和纵向、横向和垂直方向上的相关偏移量从桩号/参考点计算出来。该示例包含由长方体表示的IfcBuildingElementProxy产品。该元素以多种方式定位：-IfcLocalPlacement：欧几里得点由x、y和z值直接给定IfcLinerPlacement：位置由沿参考曲线的距离和方向（然后包含有关偏移的信息）定义。

先决条件

此方案基于以下其他方案：-无

所容纳之物

此方案基于以下方案：-项目结构-IfcProject-IfcSite-默认单元分配-IfcUnitAssignment-IfcSIUnit-alignment-IfcAlignment-核心空间结构-IfcProject-IfcSite

该场景可以通过以下概念进行扩展：-GeoRef（参见Georeferenceing_1场景）-高级空间结构-元素集合和聚合-高级几何表示

支持文件

以下文件对应于此场景：

IFC-SPF source

ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('ViewDefinition []'), '2;1');
FILE_NAME('', '2019-09-19T10:23:29', (''), (''), 'Processor version 5.0.0.0', '', '');
FILE_SCHEMA(('IFC4X3_RC2'));
ENDSEC;
DATA;

/* IfcRoad WP5 Prototypical Implementation  */
/* Author: Sebastian Esser; Technical University of Munich, Chair of Computational Modeling and Simulation and Autodesk. [email protected] */
/* Please note: This sample is partially hand-coded and may contain mistakes. */
/* Version: 02 */

/* !!! This sample contains IFC4x1 entities. However, from IFC4X1 to IFC4x2, several changes were applied to IfcLinearPlacement !! */
/* --- --- --- --- --- --- --- --- */

/* -- Base setup: project, credits, units, ... */
#1=IFCPROJECT('2dGnaVksj48hS2oyo_XxlK',#2,'LinearPlacement Sample',$,$,$,$,(#15),#7);
#2=IFCOWNERHISTORY(#5,#6,$,.ADDED.,1549899150,$,$,0);
#3=IFCPERSON($,'Esser','Sebastian',$,$,$,$,$);
#4=IFCORGANIZATION($,'Technical University of Munich',$,$,$);
#5=IFCPERSONANDORGANIZATION(#3,#4,$);
#6=IFCAPPLICATION(#4,'1.0','TUM_CMS_SE','notDefined');

#7=IFCUNITASSIGNMENT((#8,#9,#10,#11));
#8=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
#9=IFCSIUNIT(*,.PLANEANGLEUNIT.,$,.RADIAN.);
#10=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
#11=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);

/* site and alignment placement */
#12=IFCLOCALPLACEMENT($,#13);
#13=IFCAXIS2PLACEMENT3D(#14,$,$);
#14=IFCCARTESIANPOINT((0.,0.,0.));

/* representation context is necessary to have geometric product representations */
#15=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,$,#13,$);

/* -- setup a simple IfcSite containing the products and the alignment curve */
#16=IFCSITE('3_lzWZ4lL1xBtgb_k89blG',#2,'AlignmentSite','Samples for IfcLocalPlacement and IfcLinearPlacement',$,#12,$,$,$,$,$,0.,$,$);

#17=IFCRELAGGREGATES('1oEWrejW14$hUYRDBPoxmo',#2,$,$,#1,(#16));
#18=IFCRELCONTAINEDINSPATIALSTRUCTURE('2FzbCnjPP0pOSTW0cCcjnt',#2,$,$,(#19,#90,#100,#110,#120),#16);

/* --- --- --- --- --- --- --- --- */

/* -- IfcAlignment defining the linear referencing system */
#19=IFCALIGNMENT('3RGarZbNb8aQVemB05KsyD',#2,'sampleAlignment','Alignment with 2 horiz segments and 0 vertical segments',$,#12,$,#20,$);
#20=IFCALIGNMENTCURVE(#21,$,$);
#21=IFCALIGNMENT2DHORIZONTAL($,(#25,#28));

/* Horizontal segments */
#23=IFCLINESEGMENT2D(#24,1.5707963267948966,1000.);
#24=IFCCARTESIANPOINT((0.,0.));
#25=IFCALIGNMENT2DHORIZONTALSEGMENT($,$,$,#23);

#26=IFCCIRCULARARCSEGMENT2D(#27,1.5707963267948966,785.39816339744823,500.,.F.);
#27=IFCCARTESIANPOINT((0.,1000.));
#28=IFCALIGNMENT2DHORIZONTALSEGMENT($,$,$,#26);

/* Vertical segments */


/* --- --- --- --- --- --- --- --- */

/* -- Geometry of product*/
/* Note: The placement point is NOT the center of mass! */
#50=IFCCARTESIANPOINTLIST3D(((10.,20.,50.),(0.,20.,50.),(10.,0.,50.),(10.,0.,50.),(0.,20.,50.),(0.,0.,50.),(10.,0.,0.),(0.,0.,0.),(10.,20.,0.),(10.,20.,0.),(0.,0.,0.),(0.,20.,0.),(0.,0.,50.),(0.,0.,0.),(10.,0.,50.),(10.,0.,50.),(0.,0.,0.),(10.,0.,0.),(0.,20.,50.),(0.,20.,0.),(0.,0.,50.),(0.,0.,50.),(0.,20.,0.),(0.,0.,0.),(10.,20.,50.),(10.,20.,0.),(0.,20.,50.),(0.,20.,50.),(10.,20.,0),(0,20.,0),(10.,0.,50.),(10.,0.,0.),(10.,20.,50.),(10.,20.,50.),(10.,0.,0.),(10.,20.,0.)),$);
#51=IFCTRIANGULATEDFACESET(#50,$,.T.,((1,2,3),(4,5,6),(7,8,9),(10,11,12),(13,14,15),(16,17,18),(19,20,21),(22,23,24),(25,26,27),(28,29,30),(31,32,33),(34,35,36)),$);
#52=IFCSHAPEREPRESENTATION(#15,'Body','Tessellation',(#51));
#53=IFCPRODUCTDEFINITIONSHAPE($,$,(#52));

/* -- IfcProduct instance with IfcLinearPlacement */
#90=IFCBUILDINGELEMENTPROXY('2uEmTbIVTEr94hFPqz1_N9',#2,'linear positioned in arc segment',$,$,#91,#53,$,$);
/* -- IfcLinearPlacement: station 600m, 14m lateral offset, 0m vertical offset, 0m logitudinal offset, measurement should be applied the horizontal projection (has no impact in this sample since no vertical alignment has been defined) */
#91=IFCLINEARPLACEMENT($,#20,#92,#93,$);
#92=IFCDISTANCEEXPRESSION(600.,-14.,0.,0.,.T.);
#93=IFCORIENTATIONEXPRESSION(#94,#95);
#94=IFCDIRECTION((1.,0.,0.));
#95=IFCDIRECTION((0.,0.,1.));

/* -- IfcProduct instance with IfcLinearPlacement, placement at arc segment */
#100=IFCBUILDINGELEMENTPROXY('2uEmTbIVTEr94hFPqz1_M9',#2,'linear positioned',$,$,#101,#53,$,$);

/* -- IfcLinearPlacement for #100:  */
#101=IFCLINEARPLACEMENT($,#20,#102,#103,$);
#102=IFCDISTANCEEXPRESSION(1500.,-14.,0.,0.,.T.);
#103=IFCORIENTATIONEXPRESSION(#104,#105);
#104=IFCDIRECTION((0.,0.,1.));
#105=IFCDIRECTION((1.,0.,0.));

/* -- IfcProduct instance with IfcLocalPlacement - no rotation */
#110=IFCBUILDINGELEMENTPROXY('3$fw5brl95uh4EJX8NGPg7',#2,'euclidian positioned','localPos',$,#111,#53,$,$);

/* -- IfcProduct instance with local/euclidian placement */
#111=IFCLOCALPLACEMENT($,#112);
#112=IFCAXIS2PLACEMENT3D(#113,#114,#115);
#113=IFCCARTESIANPOINT((100.,0.,0.));
#114=IFCDIRECTION((1.,0.,0.));
#115=IFCDIRECTION((0.,0.,1.));

/* -- IfcProduct instance with IfcLocalPlacement - rotated */
#120=IFCBUILDINGELEMENTPROXY('3$fw5brl95uh4EJX8NGPf7',#2,'euclidian and rotated positioned','localPos + Rotation',$,#121,#53,$,$);

/* -- IfcProduct instance with local/euclidian placement - rotated */
#121=IFCLOCALPLACEMENT($,#122);
#122=IFCAXIS2PLACEMENT3D(#123,#124,#125);
#123=IFCCARTESIANPOINT((100.,20.,0.));
#124=IFCDIRECTION((0.4142,0.4142,0.));
#125=IFCDIRECTION((0.,0.,1.));

ENDSEC;
END-ISO-10303-21;

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