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Arch: Allow to export structural analysis model to IFC
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| # *************************************************************************** | ||
| # * Copyright (c) 2020 Yorik van Havre <yorik@uncreated.net> * | ||
| # * * | ||
| # * This program is free software; you can redistribute it and/or modify * | ||
| # * it under the terms of the GNU Lesser General Public License (LGPL) * | ||
| # * as published by the Free Software Foundation; either version 2 of * | ||
| # * the License, or (at your option) any later version. * | ||
| # * for detail see the LICENCE text file. * | ||
| # * * | ||
| # * This program is distributed in the hope that it will be useful, * | ||
| # * but WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
| # * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
| # * GNU Library General Public License for more details. * | ||
| # * * | ||
| # * You should have received a copy of the GNU Library General Public * | ||
| # * License along with this program; if not, write to the Free Software * | ||
| # * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * | ||
| # * USA * | ||
| # * * | ||
| # *************************************************************************** | ||
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| from __future__ import print_function | ||
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| __title__ = "FreeCAD structural IFC export tools" | ||
| __author__ = "Yorik van Havre" | ||
| __url__ = "https://www.freecadweb.org" | ||
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| ALLOW_LINEAR_OBJECTS = True # allow non-solid objects (wires, etc) to become analytic objects? | ||
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| structural_nodes = {} # this keeps track of nodes during this session | ||
| scaling = 1.0 # this keeps track of scaling during this session | ||
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| def setup(ifcfile,ifcbin,scale): | ||
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| """Creates all the needed setup for structural model.""" | ||
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| global structural_nodes,scaling | ||
| structural_nodes = {} | ||
| scaling = scale | ||
| import ifcopenshell | ||
| uid = ifcopenshell.guid.new | ||
| owh = ifcfile.by_type("IfcOwnerHistory")[0] | ||
| prj = ifcfile.by_type("IfcProject")[0] | ||
| ctx = createStructuralContext(ifcfile) | ||
| if ifcfile.wrapped_data.schema_name == "IFC2X3": | ||
| mod = ifcfile.createIfcStructuralAnalysisModel(uid(),owh,"Structural Analysis Model",None,None,"NOTDEFINED",None,None,None) | ||
| else: | ||
| pla = ifcbin.createIfcLocalPlacement() | ||
| mod = ifcfile.createIfcStructuralAnalysisModel(uid(),owh,"Structural Analysis Model",None,None,"NOTDEFINED",None,None,None,pla) | ||
| rel = ifcfile.createIfcRelDeclares(uid(),owh,None,None,prj,[mod]) | ||
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| def createStructuralContext(ifcfile): | ||
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| """Creates an additional geometry context for structural objects. Returns the new context""" | ||
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| contexts = ifcfile.by_type("IfcGeometricRepresentationContext") | ||
| # filter out subcontexts | ||
| contexts = [c for c in contexts if c.is_a() == "IfcGeometricRepresentationContext"] | ||
| ctx = contexts[0] # arbitrarily take the first one... | ||
| structcontext = ifcfile.createIfcGeometricRepresentationSubContext('Analysis','Axis',None,None,None,None,ctx,None,"GRAPH_VIEW",None) | ||
| return structcontext | ||
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| def getStructuralContext(ifcfile): | ||
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| """Returns the structural context from the file""" | ||
| for c in ifcfile.by_type("IfcGeometricRepresentationSubContext"): | ||
| if c.ContextIdentifier == "Analysis": | ||
| return c | ||
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| def createStructuralNode(ifcfile,ifcbin,point): | ||
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| """Creates a connection node at the given point""" | ||
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| import ifcopenshell | ||
| uid = ifcopenshell.guid.new | ||
| owh = ifcfile.by_type("IfcOwnerHistory")[0] | ||
| ctx = getStructuralContext(ifcfile) | ||
| cpt = ifcbin.createIfcCartesianPoint(tuple(point)) | ||
| vtx = ifcfile.createIfcVertexPoint(cpt) | ||
| rep = ifcfile.createIfcTopologyRepresentation(ctx,'Analysis','Vertex',[vtx]) | ||
| psh = ifcfile.createIfcProductDefinitionShape(None,None,[rep]) | ||
| # boundary conditions serve for ex. to create fixed nodes | ||
| #cnd = ifcfile.createIfcBoundaryNodeCondition("Fixed",ifcfile.createIfcBoolean(True),ifcfile.createIfcBoolean(True),ifcfile.createIfcBoolean(True),ifcfile.createIfcBoolean(True),ifcfile.createIfcBoolean(True),ifcfile.createIfcBoolean(True)) | ||
| # for now we don't create any boundary condition | ||
| cnd = None | ||
| pla = ifcbin.createIfcLocalPlacement() | ||
| prd = ifcfile.createIfcStructuralPointConnection(uid(),owh,'Vertex',None,None,pla,psh,cnd,None) | ||
| return prd | ||
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| def createStructuralMember(ifcfile,ifcbin,obj): | ||
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| """Creates a structural member if possible. Returns the member""" | ||
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| global structural_nodes | ||
| prd = None | ||
| import Draft | ||
| import Part | ||
| import ifcopenshell | ||
| uid = ifcopenshell.guid.new | ||
| owh = ifcfile.by_type("IfcOwnerHistory")[0] | ||
| ctx = getStructuralContext(ifcfile) | ||
| edges = None | ||
| if Draft.getType(obj) not in ["Structure"]: | ||
| if ALLOW_LINEAR_OBJECTS and obj.isDerivedFrom("Part::Feature"): | ||
| if obj.Shape.Faces: | ||
| return None | ||
| elif not obj.Shape.Edges: | ||
| return None | ||
| else: | ||
| edges = obj.Shape.Edges | ||
| else: | ||
| wire = Part.makePolygon([obj.Placement.multVec(n) for n in obj.Nodes]) | ||
| edges = wire.Edges | ||
| if not edges: | ||
| return None | ||
| for edge in edges: | ||
| if len(edge.Vertexes) > 1: | ||
| # we don't care about curved edges just now... | ||
| v0 = edge.Vertexes[0].Point.multiply(scaling) | ||
| v1 = edge.Vertexes[-1].Point.multiply(scaling) | ||
| cp1 = ifcbin.createIfcCartesianPoint(tuple(v0)) | ||
| cp2 = ifcbin.createIfcCartesianPoint(tuple(v1)) | ||
| upv = ifcbin.createIfcDirection((0,0,1)) | ||
| pla = ifcbin.createIfcLocalPlacement() | ||
| vp1 = ifcfile.createIfcVertexPoint(cp1) | ||
| vp2 = ifcfile.createIfcVertexPoint(cp2) | ||
| edg = ifcfile.createIfcEdge(vp1,vp2) | ||
| rep = ifcfile.createIfcTopologyRepresentation(ctx,'Analysis','Edge',[edg]) | ||
| psh = ifcfile.createIfcProductDefinitionShape(None,None,[rep]) | ||
| prd = ifcfile.createIfcStructuralCurveMember(uid(),owh,obj.Label,None,None,pla,psh,"RIGID_JOINED_MEMBER",upv) | ||
| # check for existing connection nodes | ||
| for v in [v0,v1]: | ||
| vk = tuple(v) | ||
| if vk in structural_nodes: | ||
| if structural_nodes[vk]: | ||
| n = structural_nodes[vk] | ||
| else: | ||
| # there is another member with same point, create a new node | ||
| n = createStructuralNode(ifcfile,ifcbin,v) | ||
| structural_nodes[vk] = n | ||
| ifcfile.createIfcRelConnectsStructuralMember(uid(),None,None,None,prd,n,None,None,None,None); | ||
| else: | ||
| # just add the point, no other member using it yet | ||
| structural_nodes[vk] = None | ||
| return prd | ||
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| def createStructuralGroup(ifcfile): | ||
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| "Assigns all structural objects found in the file to the structual model""" | ||
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| import ifcopenshell | ||
| uid = ifcopenshell.guid.new | ||
| owh = ifcfile.by_type("IfcOwnerHistory")[0] | ||
| edges = ifcfile.by_type("IfcStructuralCurveMember") | ||
| verts = ifcfile.by_type("IfcStructuralPointConnection") | ||
| model = ifcfile.by_type("IfcStructuralAnalysisModel")[0] | ||
| if model: | ||
| members = edges + verts | ||
| if members: | ||
| ifcfile.createIfcRelAssignsToGroup(uid(),owh,None,None,members,"PRODUCT",model) | ||
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| def associates(ifcfile,aobj,sobj): | ||
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| """Associates an arch object with a struct object""" | ||
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| # This is probably not the right way to do this, ie. relate a structural | ||
| # object with an IfcProduct. Needs to investigate more.... | ||
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| import ifcopenshell | ||
| uid = ifcopenshell.guid.new | ||
| owh = ifcfile.by_type("IfcOwnerHistory")[0] | ||
| ifcfile.createIfcRelAssignsToProduct(uid(),owh,None,None,[sobj],None,aobj) |