FFaBody.H

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// SPDX-FileCopyrightText: 2023 SAP SE
//
// SPDX-License-Identifier: Apache-2.0
//
// This file is part of FEDEM - https://openfedem.org
 
#ifndef FFA_BODY_H
#define FFA_BODY_H
 
#include <vector>
#include <string>
 
#include "FFaLib/FFaAlgebra/FFaTensor3.H"
#include "FFaLib/FFaAlgebra/FFaVec3.H"
 
using FaEdge = std::pair<size_t,size_t>; 
class FaFace;
class FaMat34;
 
 
class FFaBody
{
public:
  FFaBody() : myVolume(0.0), startVx(0) { isVolumeComputed = isBBoxComputed = false; }
 
  size_t getNoVertices() const { return myVertices.size(); }
  size_t getNoFaces() const { return myFaces.size(); }
 
  bool computeBoundingBox(FaVec3& minX, FaVec3& maxX) const;
  bool computeTotalVolume(double& Vb, FaVec3& C0b, FFaTensor3* Ib = NULL) const;
  bool computeVolumeBelow(double& Vb, double& As, FaVec3& C0b, FaVec3& C0s,
              const FaVec3& normal, double z0,
              double zeroTol = 1.0e-16);
 
  bool saveIntersection(const FaMat34& cs);
  bool computeIncArea(double& dAs, FaVec3& C0s,
              const FaVec3& normal, const FaMat34& cs);
 
  size_t addFace(int v1, int v2, int v3, int v4 = -1);
  size_t addVertex(const FaVec3& pos, double tol = -1.0);
  const FaVec3& getVertex(size_t idx) const { return myVertices[idx]; }
  int getFaceVtx(size_t idx, int i) const;
 
  static FFaBody* readFromCAD(std::istream& in, double duplTol = -1.0);
  bool writeCAD(const std::string& fileName, const FaMat34& partCS) const;
 
protected:
  static FFaBody* readSTL(std::istream& in, double duplTol);
  static FFaBody* readCAD(std::istream& in);
  static FFaBody* readWRL(std::istream& in, int version);
 
  static void readWRL1     (FFaBody*& body, std::istream& in);
  static void readWRL2     (FFaBody*& body, std::istream& in);
  static void readChildren (FFaBody*& body, const FaMat34& bodyCS,
                            std::istream& in);
  static void readTransform(FFaBody*& body, const FaMat34& bodyCS,
                            std::istream& in);
  static void readShape    (FFaBody*& body, const FaMat34& bodyCS,
                            std::istream& in);
 
  void readIndexedFaceSet(std::istream& in, const FaMat34& partCS);
  void readBody(std::istream& in, const FaMat34& partCS);
  void readCoords(std::istream& in, const FaMat34& partCS, char endChar = '}');
  void readFaces(std::istream& in, char endChar = '}');
  void readFace(std::istream& in);
 
public:
  static std::string prefix;
 
private:
  mutable bool        isBBoxComputed;
  mutable FaVec3      myBBox[2];
  std::vector<FaVec3> myVertices;
  std::vector<FaFace> myFaces;
  FaVec3              myX0s;
  std::vector<FaVec3> myLoopVer;
  std::vector<FaEdge> myIntLoop;
  mutable char        isVolumeComputed;
  mutable double      myVolume;
  mutable FFaTensor3  myInertia;
  mutable FaVec3      myCentroid;
  size_t              startVx;
};
 
 
class FaFace
{
public:
  FaFace();
  FaFace(FFaBody* body, size_t i1, size_t i2, size_t i3, int i4 = -1);
 
  int intersect(const FaVec3& normal, double z0, double zeroTol = 1.0e-16);
  bool isIntersected() const { return iEdge.first != iEdge.second; }
  bool isBelow() const { return IAmBelow; }
 
  size_t size() const { return myVertices.size(); }
  size_t operator[](int i) const { return myVertices[i]; }
  const FaVec3& vertex(int i) const { return owner->getVertex(myVertices[i]); }
 
  double accumulateArea(const FaVec3& vn, const FaVec3& v0, FaVec3& X) const;
  double accumulateVolume(const FaVec3& v0, FaVec3& X, FFaTensor3* I) const;
 
  const std::vector<FaFace>& getSubFaces() const { return mySubFaces; }
  FaEdge getIntEdge() const { return iEdge; }
  FaVec3 getIntEdgeCoord() const;
  FFaBody* getBody() const { return owner; }
 
protected:
  int quad2Quads(const char* status, const double* dist);
  int quad2QuadTria(const char* status, const double* dist, bool oneAbove);
 
  friend std::ostream& operator<<(std::ostream& s, const FaFace& f);
 
private:
  std::vector<size_t> myVertices; 
  FaEdge              iEdge;      
  std::vector<FaFace> mySubFaces; 
  bool                IAmBelow;   
 
  FFaBody* owner; 
};
 
 
inline int FFaBody::getFaceVtx(size_t idx, int i) const
{
  return i >= 0 && (size_t)i < myFaces[idx].size() ? myFaces[idx][i] : -1;
}
 
#endif