【Revit API】梁构件支座检查算法
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一、前言
应该是第二次写关于Revit API的博文了。虽然在BIM企业中工作，从事桌面BIM软件开发，但是我是不怎么喜欢写Revit API相关的代码。平时更多的是在写界面展示，架构维护，授权验证这块。为什么不喜欢Revit API呢？其实Autodesk封装的这套API是不错的（我在之后的工作中用起来挺舒服的），可能还是人比较懒吧，老查英文的API手册有点烦，而且这手册界面让我想起了上学时帮导师写ObjectARX的痛苦经历。。。
吐槽完之后，开始上干货。为什么需要去判断梁构件是否有支座？原因有以下几个点：
1. 提醒BIM建模设计师其设计的梁构件是否正确，说白点就是：你丫画对了没？！
a. 如果有支座，支座与梁的位置是否符合图纸；
b. 如果没支座，为什么？是画错了（画成虚接触）还是本身就没有支座；
2. 如果梁有支座，OK！我根据平法规则自动分析节点并自动生成钢筋，完美；（这是后话，此篇不做节点分析与钢筋生成）
开发这个功能还是想帮助建模人员去检查自己画的模型。中国之大，BIM建模人员参差不齐，一个人就一种画法。
本篇会以图文代码结合的方式叙述，保证初来认识Revit的朋友也能看得懂，也希望高手能提提改进建议。
二、正文
Revit 版本：2016，
主函数：IsBeamHasSeat(Element element)，
作用：判断梁构件是否有支座，适用于直梁与弧形梁。
思路：因为梁有支座的话肯定要有2个构件作为其支座，不然就翘脚了。counter就是计数器，如果到2了，就不用执行了，返回true即可。
说明：
1. 相交构件的函数GetJointElements是自己封装的，各位可根据实际自己编写，不暴露了。作用就是获取该梁周围一定范围内的所有构件；
2. IsStructrualColumn()，IsStructrualBeam()也是自己封装的，比较简单，不暴露了。作用就是要求作为梁支座的柱与梁是结构型构件，墙不用。
3. IsCoulmnBeSeatForBeam()，IsWallBeSeatForBeam()，IsBeamBeSeatForBeam() 这三个函数是核心，下面会慢慢展开讲。
public static bool IsBeamHasSeat(Element element)
{ int counter = 0; //获取相交构件 var jointElements = BaseGeomUtils.GetJointElements(element); if (jointElements != null && jointElements.Any()) { //检查柱的 foreach (var column in jointElements) { if (column.IsStructuralColumn() && IsCoulmnBeSeatForBeam(element, column)) { counter++; } if (counter == 2) { return true; } } //检查墙的 foreach (var wall in jointElements) { if (IsWallBeSeatForBeam(element, wall)) { counter++; } if (counter == 2) { return true; } } //检查梁的 foreach (var beam in jointElements) { if (beam.IsStructuralBeam() && IsBeamBeSeatForBeam(element, beam)) { counter++; } if (counter == 2) { return true; } } } return false;}
A. 判断柱构件是否为当前梁的支座
这时候要上图了，方便理解。
第1个大条件：
如果不符合这个条件，说明梁与柱可能是侧面相交的关系：
private static bool IsCoulmnBeSeatForBeam(Element currentBeam, Element jointColumn){ try { var minArea = 0.1; var columnBottomFace = FaceUtils.GetBottomFace(jointColumn, minArea); var beamBottomFace = FaceUtils.GetBottomFace(currentBeam, minArea); //柱的下底面低于梁的下底面 bool isLower = columnBottomFace.Origin.Z < beamBottomFace.Origin.Z; //取Location和LocationCurve var columnLocation = jointColumn.Location as LocationPoint; var beamLocationCurve = currentBeam.Location as LocationCurve; if (columnLocation != null && beamLocationCurve != null) { //1.Column的Location在Beam的Location下面 //2.Column的LocationPoint能映射到Beam的下底面 //3.Beam中有点可以投影到Column的下底面 if (beamBottomFace.Project(columnLocation.Point) != null || beamLocationCurve.Curve.Tessellate().Any(x => columnBottomFace.Project(x) != null && isLower)) { return true; } //侧面关系 else { var bc = beamLocationCurve.Curve; //获取构件侧面（除去Z方向上下两个面） var columnFaces = FaceUtils.GetSideFaces(jointColumn); var beamFaces = FaceUtils.GetSideFaces(currentBeam); var line = bc as Line; if (line != null) { var beamLine = line.Direction; //梁两端的面 var terminalFaces = beamFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine)); //判断梁的两端面与支座梁的侧面有没有相交 if (columnFaces.Any(fc => terminalFaces.Any(tf => tf.Intersect(fc) == FaceIntersectionFaceResult.Intersecting))) { return true; } //没有相交则继续 //找到梁与柱相交面 var matchedItem = columnFaces.Where( x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine)); var sp = line.GetEndPoint(0); var ep = line.GetEndPoint(1); //梁的端点能否投影到柱的相交面上 if (matchedItem.Any()) { var canProject = matchedItem.Any(face => face.Project(sp) != null || face.Project(ep) != null); if (canProject && isLower) { return true; } } } else if (bc is Arc) { var sp = bc.GetEndPoint(0); var ep = bc.GetEndPoint(1); var points = bc.Tessellate().Where(x => !x.IsAlmostEqualTo(sp) && !x.IsAlmostEqualTo(ep)); var closeSp = points.FirstOrDefault(); var closeEp = points.LastOrDefault(); var tangentSp = closeSp - sp; var tangentEp = closeEp - ep; //找到梁与柱相交面 var matchedItem = columnFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentEp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentEp) < UnitConverter.AngleToRad(30)); //梁的端点能否投影到柱的相交面上 if (matchedItem.Any() && isLower) { var isInsect = columnFaces.Any(fc => beamFaces.Any(x => x.Intersect(fc) == FaceIntersectionFaceResult.Intersecting)); var canProject = matchedItem.Any(face => face.Project(sp) != null || face.Project(ep) != null); if ((isInsect || canProject) && isLower) { return true; } } } } } } catch (Exception) { return false; } return false;}
B. 判断墙构件是否为当前梁的支座
墙的判断与柱类似，但是墙没有LocationPoint，但有LocationCurve，所以是这样的：
private static bool IsWallBeSeatForBeam(Element currentBeam, Element jointWall) { try { if (jointWall is Wall) { var currentWall = jointWall as Wall; var minArea = 0.1; var wallBottomFace = FaceUtils.GetBottomFace(currentWall, minArea); var beamBottomFace = FaceUtils.GetBottomFace(currentBeam, minArea); //墙的下底面低于梁的下底面 bool isLower = wallBottomFace.Origin.Z < beamBottomFace.Origin.Z; //取LocationCurve var wallLocationCurve = currentWall.Location as LocationCurve; var beamLocationCurve = currentBeam.Location as LocationCurve; if (wallLocationCurve != null && beamLocationCurve != null) { //1.Wall的Location在Beam的Location下面 //2.Wall中有点可以投影到Beam的下底面 //3.Beam中有点可以投影到Wall的下底面 if (wallLocationCurve.Curve.Tessellate().Any(pt => beamBottomFace.Project(pt) != null || beamLocationCurve.Curve.Tessellate().Any(x => wallBottomFace.Project(x) != null && isLower))) { return true; } //侧面关系 else { var bc = beamLocationCurve.Curve; var wallFaces = FaceUtils.GetSideFaces(currentWall); var beamFaces = FaceUtils.GetSideFaces(currentBeam); var line = bc as Line; if (line != null) { var beamLine = line.Direction; //梁两端的面 var terminalFaces = beamFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine)); //判断梁的两端面与支座梁的侧面有没有相交 if (wallFaces.Any(fc => terminalFaces.Any(tf => tf.Intersect(fc) == FaceIntersectionFaceResult.Intersecting))) { return true; } //没有相交则继续 //找到梁与墙相交面 var matchedItem = wallFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine)); var sp = line.GetEndPoint(0); var ep = line.GetEndPoint(1); //梁的端点能否投影到墙的相交面上 if (matchedItem.Any()) { var canProject = matchedItem.Any(face => face.Project(sp) != null || face.Project(ep) != null); if (canProject && isLower) { return true; } } } else if (bc is Arc) { var sp = bc.GetEndPoint(0); var ep = bc.GetEndPoint(1); var points = bc.Tessellate().Where(x => !x.IsAlmostEqualTo(sp) && !x.IsAlmostEqualTo(ep)); var closeSp = points.FirstOrDefault(); var closeEp = points.LastOrDefault(); var tangentSp = closeSp - sp; var tangentEp = closeEp - ep; //找到梁与墙相交面 var matchedItem = wallFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentEp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentEp) < UnitConverter.AngleToRad(30)); //梁的端点能否投影到墙的相交面上 if (matchedItem.Any()) { var isInsect = wallFaces.Any(fc => beamFaces.Any(x => x.Intersect(fc) == FaceIntersectionFaceResult.Intersecting)); var canProject = matchedItem.Any(face => face.Project(sp) != null || face.Project(ep) != null); if ((isInsect || canProject) && isLower) { return true; } } } } } } } catch (Exception) { return false; } return false; }
C. 判断梁构件是否为当前梁的支座，这块是最最最烦的。
为什么？因为：
下面是梁作为另一个梁的支座的完整思路：
如果两个构件不是上下关系，那就要检查侧面相交关系。
我这里使用了若干个条件：conditionOne && (conditionTwo || conditionThree || conditionSp)
private static bool IsBeamBeSeatForBeam(Element currentBeam, Element jointBeam) { try { var beamLocationCurve = currentBeam.Location as LocationCurve; var seatBeamLocationCurve = jointBeam.Location as LocationCurve; var beamFaces = FaceUtils.GetSideFaces(currentBeam); var seatBeamFaces = FaceUtils.GetSideFaces(jointBeam); var seatBeamBottomFace = FaceUtils.GetBottomFace(jointBeam); if (beamLocationCurve != null && seatBeamLocationCurve != null) { var bc = beamLocationCurve.Curve; if (bc is Line) { var beamLine = (bc as Line).Direction; var sp = bc.GetEndPoint(0); var ep = bc.GetEndPoint(1); var matchedItem = seatBeamFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine) || (x as PlanarFace).SafelyFaceNormal().AngleTo(beamLine) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(-beamLine) < UnitConverter.AngleToRad(30)); if (matchedItem.Any()) { //支座梁在主体梁的下方 var canBeamCurvePointProjectToSeatBeamBottomFace = bc.Tessellate().Any(x => seatBeamBottomFace.Project(x) != null); if (canBeamCurvePointProjectToSeatBeamBottomFace) { return true; } } //支座梁在主体梁的侧面 //获取梁的两端的面 var terminalFaces = beamFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine) || (x as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine)); if (terminalFaces.Count() != 2) { terminalFaces = beamFaces; } //判断梁的两端面与支座梁的侧面有没有相交 var result = BeamHasSeatWithBeam(terminalFaces, seatBeamFaces, beamLine, matchedItem, sp, ep); if (result) { return true; } } else if (bc is Arc) { var sp = bc.GetEndPoint(0); var ep = bc.GetEndPoint(1); var points = bc.Tessellate().Where(x => !x.IsAlmostEqualTo(sp) && !x.IsAlmostEqualTo(ep)); var closeSp = points.FirstOrDefault(); var closeEp = points.LastOrDefault(); var tangentSp = closeSp - sp; var tangentEp = closeEp - ep; var matchedItem = seatBeamFaces.Where(x => (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentSp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(-tangentEp) < UnitConverter.AngleToRad(30) || (x as PlanarFace).SafelyFaceNormal().AngleTo(tangentEp) < UnitConverter.AngleToRad(30)); if (matchedItem.Any()) { var isInsect = seatBeamFaces.Any(fc => beamFaces.Any(x => x.Intersect(fc) == FaceIntersectionFaceResult.Intersecting)); var canProject = matchedItem.Any(face => face.Project(sp) != null || face.Project(ep) != null); if (isInsect || canProject) { return true; } } } } } catch (Exception) { return false; } return false; }
private static bool BeamHasSeatWithBeam(IEnumerable<Face> terminalFaces, IEnumerable<Face> seatBeamFaces, XYZ beamLine,
IEnumerable<Face> seatBeamSpecialFaces, XYZ startpoint, XYZ endpoint) { //梁任意端点能投影到支座梁的对迎面 var conditionSp = seatBeamSpecialFaces.Any() && seatBeamSpecialFaces.Any(x => x.Project(startpoint) != null || x.Project(endpoint) != null); foreach (var tf in terminalFaces) { foreach (var fc in seatBeamFaces) { //支座梁的Face生成Solid var seatBeamCl = (fc as PlanarFace).GetEdgesAsCurveLoops().ToList(); Solid seatBeamTempSolid = GeometryCreationUtilities.CreateExtrusionGeometry(seatBeamCl, fc.ComputeNormal(new UV().Negate()), UnitUtils.ConvertToInternalUnits(0.5, DisplayUnitType.DUT_MILLIMETERS)); var seatBeamDestFaces = (from object f in seatBeamTempSolid.Faces where (f as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(beamLine) ||
(f as PlanarFace).SafelyFaceNormal().IsAlmostEqualTo(-beamLine) ||
(f as PlanarFace).Project(startpoint) != null ||
(f as PlanarFace).Project(endpoint) != null select f as PlanarFace).ToList(); if (!seatBeamDestFaces.Any()) { seatBeamDestFaces = (from object f in seatBeamTempSolid.Faces select f as PlanarFace).ToList(); } //梁的Face生成Solid var beamCL = (tf as PlanarFace).GetEdgesAsCurveLoops().ToList(); Solid beamTempSolid = GeometryCreationUtilities.CreateExtrusionGeometry(beamCL, tf.ComputeNormal(new UV().Negate()), UnitUtils.ConvertToInternalUnits(0.5, DisplayUnitType.DUT_MILLIMETERS)); var beamDestFaces = (from object f in beamTempSolid.Faces select f as PlanarFace).ToList(); //梁与支座梁有相交 var conditionOne = seatBeamDestFaces.Any(x=> tf.Intersect(x) == FaceIntersectionFaceResult.Intersecting || x.Project(startpoint) != null || x.Project(endpoint) != null) || seatBeamDestFaces.Any(x=> beamDestFaces.Any(y=>y.Intersect(x) == FaceIntersectionFaceResult.Intersecting)); var fc1 = (tf as PlanarFace).SafelyFaceNormal(); var conditionTwo = seatBeamDestFaces.Any(x=> fc1.IsAlmostEqualTo(x.SafelyFaceNormal()) || fc1.IsAlmostEqualTo(-x.SafelyFaceNormal())); var conditionThree = seatBeamDestFaces.Any(x => fc1.AngleTo(x.SafelyFaceNormal()) < UnitConverter.AngleToRad(30) || fc1.AngleTo(x.SafelyFaceNormal()) < UnitConverter.AngleToRad(30)); if (conditionOne && (conditionTwo || conditionThree || conditionSp)) { return true; } } } return false; }
代码中有一些自己封装的函数，比如求构件所有底面，求构件所有侧面，比较简单，这里就不暴露了。本篇主要以思路为主，掌握了思路代码也就清晰了。
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