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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the
+ following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the
+ following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+ contributors may be used to endorse or promote products
+ derived from this software without specific prior
+ written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file IFC.cpp
+ * @brief Implementation of the Industry Foundation Classes loader.
+ */
+
+#ifndef INCLUDED_IFCUTIL_H
+#define INCLUDED_IFCUTIL_H
+
+#include "AssetLib/IFC/IFCReaderGen_2x3.h"
+#include "AssetLib/IFC/IFCLoader.h"
+#include "AssetLib/Step/STEPFile.h"
+
+#include <assimp/mesh.h>
+#include <assimp/material.h>
+
+#include <utility>
+
+struct aiNode;
+
+namespace Assimp {
+namespace IFC {
+
+ typedef double IfcFloat;
+
+ // IfcFloat-precision math data types
+ typedef aiVector2t<IfcFloat> IfcVector2;
+ typedef aiVector3t<IfcFloat> IfcVector3;
+ typedef aiMatrix4x4t<IfcFloat> IfcMatrix4;
+ typedef aiMatrix3x3t<IfcFloat> IfcMatrix3;
+ typedef aiColor4t<IfcFloat> IfcColor4;
+
+
+// ------------------------------------------------------------------------------------------------
+// Helper for std::for_each to delete all heap-allocated items in a container
+// ------------------------------------------------------------------------------------------------
+template<typename T>
+struct delete_fun {
+ void operator()(T* del) {
+ delete del;
+ }
+};
+
+
+
+// ------------------------------------------------------------------------------------------------
+// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.
+// ------------------------------------------------------------------------------------------------
+struct TempMesh {
+ std::vector<IfcVector3> mVerts;
+ std::vector<unsigned int> mVertcnt;
+
+ // utilities
+ aiMesh* ToMesh();
+ void Clear();
+ void Transform(const IfcMatrix4& mat);
+ IfcVector3 Center() const;
+ void Append(const TempMesh& other);
+ bool IsEmpty() const;
+ void RemoveAdjacentDuplicates();
+ void RemoveDegenerates();
+ void FixupFaceOrientation();
+ static IfcVector3 ComputePolygonNormal(const IfcVector3* vtcs, size_t cnt, bool normalize = true);
+ IfcVector3 ComputeLastPolygonNormal(bool normalize = true) const;
+ void ComputePolygonNormals(std::vector<IfcVector3>& normals, bool normalize = true, size_t ofs = 0) const;
+ void Swap(TempMesh& other);
+};
+
+inline
+bool TempMesh::IsEmpty() const {
+ return mVerts.empty() && mVertcnt.empty();
+}
+
+
+// ------------------------------------------------------------------------------------------------
+// Temporary representation of an opening in a wall or a floor
+// ------------------------------------------------------------------------------------------------
+struct TempOpening
+{
+ const IFC::Schema_2x3::IfcSolidModel *solid;
+ IfcVector3 extrusionDir;
+
+ std::shared_ptr<TempMesh> profileMesh;
+ std::shared_ptr<TempMesh> profileMesh2D;
+
+ // list of points generated for this opening. This is used to
+ // create connections between two opposing holes created
+ // from a single opening instance (two because walls tend to
+ // have two sides). If !empty(), the other side of the wall
+ // has already been processed.
+ std::vector<IfcVector3> wallPoints;
+
+ // ------------------------------------------------------------------------------
+ TempOpening()
+ : solid()
+ , extrusionDir()
+ , profileMesh()
+ {
+ }
+
+ // ------------------------------------------------------------------------------
+ TempOpening(const IFC::Schema_2x3::IfcSolidModel *solid, IfcVector3 extrusionDir,
+ std::shared_ptr<TempMesh> profileMesh,
+ std::shared_ptr<TempMesh> profileMesh2D) :
+ solid(solid), extrusionDir(extrusionDir), profileMesh(std::move(profileMesh)), profileMesh2D(std::move(profileMesh2D)) {
+ }
+
+ // ------------------------------------------------------------------------------
+ void Transform(const IfcMatrix4& mat); // defined later since TempMesh is not complete yet
+
+
+
+ // ------------------------------------------------------------------------------
+ // Helper to sort openings by distance from a given base point
+ struct DistanceSorter {
+
+ DistanceSorter(const IfcVector3& base) : base(base) {}
+
+ bool operator () (const TempOpening& a, const TempOpening& b) const {
+ return (a.profileMesh->Center()-base).SquareLength() < (b.profileMesh->Center()-base).SquareLength();
+ }
+
+ IfcVector3 base;
+ };
+};
+
+
+// ------------------------------------------------------------------------------------------------
+// Intermediate data storage during conversion. Keeps everything and a bit more.
+// ------------------------------------------------------------------------------------------------
+struct ConversionData
+{
+ ConversionData(const STEP::DB& db, const IFC::Schema_2x3::IfcProject& proj, aiScene* out,const IFCImporter::Settings& settings)
+ : len_scale(1.0)
+ , angle_scale(-1.0)
+ , db(db)
+ , proj(proj)
+ , out(out)
+ , settings(settings)
+ , apply_openings()
+ , collect_openings()
+ {}
+
+ ~ConversionData() {
+ std::for_each(meshes.begin(),meshes.end(),delete_fun<aiMesh>());
+ std::for_each(materials.begin(),materials.end(),delete_fun<aiMaterial>());
+ }
+
+ IfcFloat len_scale, angle_scale;
+ bool plane_angle_in_radians;
+
+ const STEP::DB& db;
+ const IFC::Schema_2x3::IfcProject& proj;
+ aiScene* out;
+
+ IfcMatrix4 wcs;
+ std::vector<aiMesh*> meshes;
+ std::vector<aiMaterial*> materials;
+
+ struct MeshCacheIndex {
+ const IFC::Schema_2x3::IfcRepresentationItem* item; unsigned int matindex;
+ MeshCacheIndex() : item(nullptr), matindex(0) { }
+ MeshCacheIndex(const IFC::Schema_2x3::IfcRepresentationItem* i, unsigned int mi) : item(i), matindex(mi) { }
+ bool operator == (const MeshCacheIndex& o) const { return item == o.item && matindex == o.matindex; }
+ bool operator < (const MeshCacheIndex& o) const { return item < o.item || (item == o.item && matindex < o.matindex); }
+ };
+ typedef std::map<MeshCacheIndex, std::set<unsigned int> > MeshCache;
+ MeshCache cached_meshes;
+
+ typedef std::map<const IFC::Schema_2x3::IfcSurfaceStyle*, unsigned int> MaterialCache;
+ MaterialCache cached_materials;
+
+ const IFCImporter::Settings& settings;
+
+ // Intermediate arrays used to resolve openings in walls: only one of them
+ // can be given at a time. apply_openings if present if the current element
+ // is a wall and needs its openings to be poured into its geometry while
+ // collect_openings is present only if the current element is an
+ // IfcOpeningElement, for which all the geometry needs to be preserved
+ // for later processing by a parent, which is a wall.
+ std::vector<TempOpening>* apply_openings;
+ std::vector<TempOpening>* collect_openings;
+
+ std::set<uint64_t> already_processed;
+};
+
+
+// ------------------------------------------------------------------------------------------------
+// Binary predicate to compare vectors with a given, quadratic epsilon.
+// ------------------------------------------------------------------------------------------------
+struct FuzzyVectorCompare {
+
+ FuzzyVectorCompare(IfcFloat epsilon) : epsilon(epsilon) {}
+ bool operator()(const IfcVector3& a, const IfcVector3& b) {
+ return std::abs((a-b).SquareLength()) < epsilon;
+ }
+
+ const IfcFloat epsilon;
+};
+
+
+// ------------------------------------------------------------------------------------------------
+// Ordering predicate to totally order R^2 vectors first by x and then by y
+// ------------------------------------------------------------------------------------------------
+struct XYSorter {
+
+ // sort first by X coordinates, then by Y coordinates
+ bool operator () (const IfcVector2&a, const IfcVector2& b) const {
+ if (a.x == b.x) {
+ return a.y < b.y;
+ }
+ return a.x < b.x;
+ }
+};
+
+
+
+// conversion routines for common IFC entities, implemented in IFCUtil.cpp
+void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourRgb& in);
+void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base);
+void ConvertCartesianPoint(IfcVector3& out, const Schema_2x3::IfcCartesianPoint& in);
+void ConvertDirection(IfcVector3& out, const Schema_2x3::IfcDirection& in);
+void ConvertVector(IfcVector3& out, const Schema_2x3::IfcVector& in);
+void AssignMatrixAxes(IfcMatrix4& out, const IfcVector3& x, const IfcVector3& y, const IfcVector3& z);
+void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement3D& in);
+void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement2D& in);
+void ConvertAxisPlacement(IfcVector3& axis, IfcVector3& pos, const IFC::Schema_2x3::IfcAxis1Placement& in);
+void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement& in, ConversionData& conv);
+void ConvertTransformOperator(IfcMatrix4& out, const Schema_2x3::IfcCartesianTransformationOperator& op);
+bool IsTrue(const Assimp::STEP::EXPRESS::BOOLEAN& in);
+IfcFloat ConvertSIPrefix(const std::string& prefix);
+
+
+// IFCProfile.cpp
+bool ProcessProfile(const Schema_2x3::IfcProfileDef& prof, TempMesh& meshout, ConversionData& conv);
+bool ProcessCurve(const Schema_2x3::IfcCurve& curve, TempMesh& meshout, ConversionData& conv);
+
+// IFCMaterial.cpp
+unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionData& conv, bool forceDefaultMat);
+
+// IFCGeometry.cpp
+IfcMatrix3 DerivePlaneCoordinateSpace(const TempMesh& curmesh, bool& ok, IfcVector3& norOut);
+bool ProcessRepresentationItem(const Schema_2x3::IfcRepresentationItem& item, unsigned int matid, std::set<unsigned int>& mesh_indices, ConversionData& conv);
+void AssignAddedMeshes(std::set<unsigned int>& mesh_indices,aiNode* nd,ConversionData& /*conv*/);
+
+void ProcessSweptAreaSolid(const Schema_2x3::IfcSweptAreaSolid& swept, TempMesh& meshout,
+ ConversionData& conv);
+
+void ProcessExtrudedAreaSolid(const Schema_2x3::IfcExtrudedAreaSolid& solid, TempMesh& result,
+ ConversionData& conv, bool collect_openings);
+
+// IFCBoolean.cpp
+
+void ProcessBoolean(const Schema_2x3::IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv);
+void ProcessBooleanHalfSpaceDifference(const Schema_2x3::IfcHalfSpaceSolid* hs, TempMesh& result,
+ const TempMesh& first_operand,
+ ConversionData& conv);
+
+void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const Schema_2x3::IfcPolygonalBoundedHalfSpace* hs, TempMesh& result,
+ const TempMesh& first_operand,
+ ConversionData& conv);
+void ProcessBooleanExtrudedAreaSolidDifference(const Schema_2x3::IfcExtrudedAreaSolid* as, TempMesh& result,
+ const TempMesh& first_operand,
+ ConversionData& conv);
+
+
+// IFCOpenings.cpp
+
+bool GenerateOpenings(std::vector<TempOpening>& openings,
+ TempMesh& curmesh,
+ bool check_intersection,
+ bool generate_connection_geometry,
+ const IfcVector3& wall_extrusion_axis = IfcVector3(0,1,0));
+
+
+
+// IFCCurve.cpp
+
+// ------------------------------------------------------------------------------------------------
+// Custom exception for use by members of the Curve class
+// ------------------------------------------------------------------------------------------------
+class CurveError {
+public:
+ CurveError(const std::string& s)
+ : mStr(s) {
+ // empty
+ }
+
+ std::string mStr;
+};
+
+// ------------------------------------------------------------------------------------------------
+// Temporary representation for an arbitrary sub-class of IfcCurve. Used to sample the curves
+// to obtain a list of line segments.
+// ------------------------------------------------------------------------------------------------
+class Curve {
+protected:
+ Curve(const Schema_2x3::IfcCurve& base_entity, ConversionData& conv)
+ : base_entity(base_entity)
+ , conv(conv) {
+ // empty
+ }
+
+public:
+ typedef std::pair<IfcFloat, IfcFloat> ParamRange;
+
+ virtual ~Curve() {}
+
+
+ // check if a curve is closed
+ virtual bool IsClosed() const = 0;
+
+ // evaluate the curve at the given parametric position
+ virtual IfcVector3 Eval(IfcFloat p) const = 0;
+
+ // try to match a point on the curve to a given parameter
+ // for self-intersecting curves, the result is not ambiguous and
+ // it is undefined which parameter is returned.
+ virtual bool ReverseEval(const IfcVector3& val, IfcFloat& paramOut) const;
+
+ // get the range of the curve (both inclusive).
+ // +inf and -inf are valid return values, the curve is not bounded in such a case.
+ virtual std::pair<IfcFloat,IfcFloat> GetParametricRange() const = 0;
+ IfcFloat GetParametricRangeDelta() const;
+
+ // estimate the number of sample points that this curve will require
+ virtual size_t EstimateSampleCount(IfcFloat start,IfcFloat end) const;
+
+ // intelligently sample the curve based on the current settings
+ // and append the result to the mesh
+ virtual void SampleDiscrete(TempMesh& out,IfcFloat start,IfcFloat end) const;
+
+#ifdef ASSIMP_BUILD_DEBUG
+ // check if a particular parameter value lies within the well-defined range
+ bool InRange(IfcFloat) const;
+#endif
+ static Curve* Convert(const IFC::Schema_2x3::IfcCurve&,ConversionData& conv);
+
+protected:
+ const Schema_2x3::IfcCurve& base_entity;
+ ConversionData& conv;
+};
+
+
+// --------------------------------------------------------------------------------
+// A BoundedCurve always holds the invariant that GetParametricRange()
+// never returns infinite values.
+// --------------------------------------------------------------------------------
+class BoundedCurve : public Curve {
+public:
+ BoundedCurve(const Schema_2x3::IfcBoundedCurve& entity, ConversionData& conv)
+ : Curve(entity,conv)
+ {}
+
+public:
+
+ bool IsClosed() const;
+
+public:
+
+ // sample the entire curve
+ void SampleDiscrete(TempMesh& out) const;
+ using Curve::SampleDiscrete;
+};
+
+// IfcProfile.cpp
+bool ProcessCurve(const Schema_2x3::IfcCurve& curve, TempMesh& meshout, ConversionData& conv);
+}
+}
+
+#endif
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