assimp/code/AssetLib/IFC/IFCUtil.h

/*
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/** @file  IFC.cpp
 *  @brief Implementation of the Industry Foundation Classes loader.
 */

#ifndef INCLUDED_IFCUTIL_H
#define INCLUDED_IFCUTIL_H

#include "AssetLib/IFC/IFCLoader.h"
#include "AssetLib/IFC/IFCReaderGen_2x3.h"
#include "AssetLib/Step/STEPFile.h"

#include <assimp/material.h>
#include <assimp/mesh.h>

struct aiNode;

namespace Assimp {
namespace IFC {

using IfcFloat = double;

// IfcFloat-precision math data types
using IfcVector2 = aiVector2t<IfcFloat>;
using IfcVector3 = aiVector3t<IfcFloat>;
using IfcMatrix4 = aiMatrix4x4t<IfcFloat>;
using IfcMatrix3 = aiMatrix3x3t<IfcFloat>;
using IfcColor4 = aiColor4t<IfcFloat>;

// ------------------------------------------------------------------------------------------------
// 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() {
        // empty
    }

    // ------------------------------------------------------------------------------
    TempOpening(const IFC::Schema_2x3::IfcSolidModel *solid, IfcVector3 extrusionDir,
            std::shared_ptr<TempMesh> profileMesh,
            std::shared_ptr<TempMesh> profileMesh2D) :
            solid(solid),
            extrusionDir(extrusionDir),
            profileMesh(profileMesh),
            profileMesh2D(profileMesh2D) {
        // empty
    }

    // ------------------------------------------------------------------------------
    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),
            plane_angle_in_radians(true),
            db(db),
            proj(proj),
            out(out),
            wcs(),
            meshes(),
            materials(),
            cached_meshes(),
            cached_materials(),
            settings(settings),
            apply_openings(nullptr),
            collect_openings(nullptr),
            already_processed() {
        // empty
    }

    ~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); }
    };
    using MeshCache = std::map<MeshCacheIndex, std::set<unsigned int>>;
    MeshCache cached_meshes;

    using MaterialCache = std::map<const IFC::Schema_2x3::IfcSurfaceStyle *, unsigned int>;
    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,
        const std::vector<IfcVector3> &nors,
        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:
    using ParamRange = std::pair<IfcFloat, IfcFloat>;

    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 override;

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);

} // namespace IFC
} // namespace Assimp

#endif