Gabriele Cosmo
383 lines
15 KiB
C++
383 lines
15 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4PolyhedraSide
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//
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// Class description:
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//
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// Class implementing a face that represents one segmented side of a polyhedra:
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//
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// G4PolyhedraSide( const G4PolyhedraSideRZ* prevRZ,
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// const G4PolyhedraSideRZ* tail,
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// const G4PolyhedraSideRZ* head,
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// const G4PolyhedraSideRZ* nextRZ,
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// G4int numSide,
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// G4double phiStart, G4double phiTotal,
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// G4bool phiIsOpen, G4bool isAllBehind=false )
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//
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// Values for r1,z1 and r2,z2 should be specified in clockwise order in (r,z).
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// Author: David C. Williams (UCSC), 1998 - Created
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// --------------------------------------------------------------------
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#ifndef G4POLYHEDRASIDE_HH
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#define G4POLYHEDRASIDE_HH
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#include "G4VCSGface.hh"
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class G4IntersectingCone;
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struct G4PolyhedraSideRZ
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{
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G4double r, z; // start of vector
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};
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// ----------------------------------------------------------------------------
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// MT-specific utility code
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#include "G4GeomSplitter.hh"
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// The class G4PhSideData is introduced to encapsulate the
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// fields of the class G4PolyhedraSide that may not be read-only.
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//
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class G4PhSideData
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{
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public:
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void initialize()
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{
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fPhix = 0.; fPhiy = 0.; fPhiz = 0.; fPhik = 0.;
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}
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G4double fPhix=0., fPhiy=0., fPhiz=0., fPhik=0.; // Cached values for phi
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};
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// The type G4PhSideManager is introduced to encapsulate the methods used
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// by both the master thread and worker threads to allocate memory space
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// for the fields encapsulated by the class G4PhSideData.
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//
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using G4PhSideManager = G4GeomSplitter<G4PhSideData>;
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//
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// ----------------------------------------------------------------------------
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/**
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* @brief G4PolyhedraSide is a utility class implementing a face that
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* represents one segmented side of a polyhedra.
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*/
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class G4PolyhedraSide : public G4VCSGface
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{
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public:
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/**
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* Constructor for the segmented side of a polyhedra.
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* @param[in] prevRZ Pointer to previous r,Z section.
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* @param[in] tail Pointer to r,Z tail of section.
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* @param[in] head Pointer to r,Z head of section.
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* @param[in] nextRZ Pointer to next r,Z section.
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* @param[in] numSide The number od sides.
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* @param[in] phiStart Initial Phi starting angle.
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* @param[in] phiTotal Total Phi angle.
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* @param[in] phiIsOpen Flag indicating if it is a Phi section.
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* @param[in] isAllBehind Indicating if entire surface is behind normal.
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*/
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G4PolyhedraSide( const G4PolyhedraSideRZ* prevRZ,
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const G4PolyhedraSideRZ* tail,
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const G4PolyhedraSideRZ* head,
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const G4PolyhedraSideRZ* nextRZ,
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G4int numSide,
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G4double phiStart, G4double phiTotal,
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G4bool phiIsOpen, G4bool isAllBehind = false );
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/**
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* Destructor.
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*/
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~G4PolyhedraSide() override;
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/**
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* Copy constructor and assignment operator.
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*/
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G4PolyhedraSide( const G4PolyhedraSide& source );
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G4PolyhedraSide& operator=( const G4PolyhedraSide& source );
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/**
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* Determines the distance along a line to the face.
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* @param[in] p Position.
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* @param[in] v Direction (assumed to be a unit vector).
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* @param[in] outgoing Flag true, to consider only inside surfaces;
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* false, to consider only outside surfaces.
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* @param[in] surfTolerance Minimum distance from the surface.
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* @param[out] distance Distance to intersection.
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* @param[out] distFromSurface Distance from surface (along surface normal),
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* < 0 if the point is in front of the surface.
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* @param[out] normal Normal of surface at intersection point.
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* @param[out] allBehind Flag, true, if entire surface is behind normal.
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* @returns true if there is an intersection, false otherwise.
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*/
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G4bool Intersect( const G4ThreeVector& p, const G4ThreeVector& v,
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G4bool outgoing, G4double surfTolerance,
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G4double& distance, G4double& distFromSurface,
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G4ThreeVector& normal, G4bool& allBehind ) override;
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/**
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* Determines the distance of a point from either the inside or outside
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* surfaces of the face.
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* @param[in] p Position.
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* @param[in] outgoing Flag, true, to consider only inside surfaces
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* or false, to consider only outside surfaces.
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* @returns The distance to the closest surface satisfying requirements
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* or kInfinity if no such surface exists.
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*/
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G4double Distance( const G4ThreeVector& p, G4bool outgoing ) override;
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/**
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* Determines whether a point is inside, outside, or on the surface of
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* the face.
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* @param[in] p Position.
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* @param[in] tolerance Tolerance defining the bounds of the "kSurface",
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* nominally equal to kCarTolerance/2.
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* @param[out] bestDistance Distance to the closest surface (in or out).
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* @returns kInside if the point is closest to the inside surface;
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* kOutside if the point is closest to the outside surface;
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* kSurface if the point is withing tolerance of the surface.
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*/
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EInside Inside( const G4ThreeVector &p, G4double tolerance,
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G4double *bestDistance ) override;
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/**
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* Returns the normal of surface closest to the point.
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* @param[in] p Position.
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* @param[out] bestDistance Distance to the closest surface (in or out).
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* @returns The normal of the surface nearest the point.
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*/
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G4ThreeVector Normal( const G4ThreeVector& p,
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G4double* bestDistance ) override;
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/**
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* Returns the face extent along the axis.
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* @param[in] axis Unit vector defining the direction.
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* @returns The largest point along the given axis of the face's extent.
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*/
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G4double Extent( const G4ThreeVector axis ) override;
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/**
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* Calculates the extent of the face for the voxel navigator.
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* @param[in] axis The axis in which to check the shapes 3D extent against.
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* @param[in] voxelLimit Limits along x, y, and/or z axes.
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* @param[in] tranform A coordinate transformation on which to apply to
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* the shape before testing.
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* @param[out] extentList The list of (voxel) extents along the axis.
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*/
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void CalculateExtent( const EAxis axis,
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const G4VoxelLimits &voxelLimit,
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const G4AffineTransform& tranform,
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G4SolidExtentList& extentList ) override;
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/**
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* Method invoked by the copy constructor or the assignment operator.
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* Its purpose is to return a pointer to a duplicate copy of the face.
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*/
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inline G4VCSGface* Clone() override { return new G4PolyhedraSide( *this ); }
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/**
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* Returning an estimation of the face surface area, in internal units.
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*/
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G4double SurfaceArea() override;
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/**
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* Fake default constructor for usage restricted to direct object
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* persistency for clients requiring preallocation of memory for
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* persistifiable objects.
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*/
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G4PolyhedraSide(__void__&);
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/**
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* Returns the instance ID.
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*/
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inline G4int GetInstanceID() const { return instanceID; }
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/**
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* Returns the private data instance manager.
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*/
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static const G4PhSideManager& GetSubInstanceManager();
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private:
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/**
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* Internal data structures.
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*/
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struct sG4PolyhedraSideVec; // Secret recipe for allowing
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friend struct sG4PolyhedraSideVec; // protected nested structures
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using G4PolyhedraSideEdge = struct sG4PolyhedraSideEdge
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{
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G4ThreeVector normal; // Unit normal to this edge
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G4ThreeVector corner[2]; // The two corners of this phi edge
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G4ThreeVector cornNorm[2]; // The normals of these corners
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};
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using G4PolyhedraSideVec = struct sG4PolyhedraSideVec
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{
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G4ThreeVector normal, // Normal (point out of the shape)
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center, // Point in center of side
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surfPhi, // Unit vector on surface pointing along phi
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surfRZ; // Unit vector on surface pointing along R/Z
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G4PolyhedraSideEdge* edges[2]; // The phi boundary edges to this side
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// [0]=low phi [1]=high phi
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G4ThreeVector edgeNorm[2]; // RZ edge normals [i] at {r[i],z[i]}
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};
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/**
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* Calculates the surface area of a triangle.
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* At the same time a random point in the triangle is given.
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*/
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G4double SurfaceTriangle( const G4ThreeVector& p1,
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const G4ThreeVector& p2,
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const G4ThreeVector& p3,
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G4ThreeVector* p4 );
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/**
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* Returns a random point located and uniformly distributed on the face.
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*/
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G4ThreeVector GetPointOnFace() override;
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/**
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* Auxiliary method for GetPointOnSurface().
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*/
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G4ThreeVector GetPointOnPlane( const G4ThreeVector& p0, const G4ThreeVector& p1,
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const G4ThreeVector& p2, const G4ThreeVector& p3,
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G4double* Area );
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/**
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* Decides if a line correctly intersects one side plane of a segment.
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* It is assumed that the correct side has been chosen, and thus only
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* the Z bounds (of the entire segment) are checked.
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* @param[in] p The point to check.
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* @param[in] v The direction.
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* @param[in] vec Description record of the side plane.
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* @param[in] normSign Sign (+/- 1) to apply to normal.
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* @param[in] surfTolerance Surface tolerance (generally > 0, see below).
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* @param[out] distance Distance along v to intersection.
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* @param[out] distFromSurface Distance from surface normal.
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* @returns true is the line is intersecting, false otherwise.
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*/
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G4bool IntersectSidePlane( const G4ThreeVector& p, const G4ThreeVector& v,
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const G4PolyhedraSideVec& vec,
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G4double normSign,
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G4double surfTolerance,
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G4double& distance,
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G4double& distFromSurface );
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/**
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* Calculates which phi segments a line intersects in three dimensions.
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* No check is made as to whether the intersections are within the Z bounds
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* of the segment.
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*/
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G4int LineHitsSegments( const G4ThreeVector& p,
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const G4ThreeVector& v,
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G4int* i1, G4int* i2 );
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/**
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* Decides which phi segment an angle belongs to, counting from zero.
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* A returned value of -1 indicates that the phi value is outside the
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* shape (only possible if phiTotal < 360 degrees).
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*/
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G4int PhiSegment( G4double phi );
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/**
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* Decides which phi segment is closest in phi to the point.
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* The result is the same as PhiSegment() if there is no phi opening.
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*/
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G4int ClosestPhiSegment( G4double phi );
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/**
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* Calculates Phi for a given 3-vector (point 'p'), if not already cached
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* for the same point, in the attempt to avoid consecutive computation of
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* the same quantity.
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*/
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G4double GetPhi( const G4ThreeVector& p );
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/**
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* Computes the total distance from the side.
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* @param[in] p The point to check.
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* @param[in] vec The vector set of this side.
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* @param[out] normDist The returned distance normal to the side or edge,
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* as appropriate, signed.
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* @returns The total distance from the side.
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*/
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G4double DistanceToOneSide( const G4ThreeVector& p,
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const G4PolyhedraSideVec& vec,
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G4double* normDist );
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/**
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* Calculates the distance of a point from the segmented surface, including
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* the effect of any phi segmentation.
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* Adds distance from side edges, if necessary, to the total distance,
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* and updates 'normDist' appropriate depending on edge normals.
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* @param[in] p The point to check.
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* @param[in] opposite If true, check the opposite hemisphere (see below).
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* @param[out] normDist The returned normal distance.
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* @returns The distance from the segmented plane.
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*/
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G4double DistanceAway( const G4ThreeVector& p,
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const G4PolyhedraSideVec& vec,
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G4double* normDist );
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/**
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* Copies parameters from other object; used in copy constructor and
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* assignment operator.
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*/
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void CopyStuff( const G4PolyhedraSide& source );
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private:
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G4int numSide = 0; // Number sides
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G4double r[2], z[2]; // r, z parameters, in specified order
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G4double startPhi, // Start phi (0 to 2pi), if phiIsOpen
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deltaPhi, // Delta phi (0 to 2pi), if phiIsOpen
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endPhi; // End phi (>startPhi), if phiIsOpen
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G4bool phiIsOpen = false; // True if there is a phi slice
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G4bool allBehind = false; // True if the entire solid is "behind" this face
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G4IntersectingCone* cone = nullptr; // Our intersecting cone
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G4PolyhedraSideVec* vecs = nullptr; // Vector set for each facet of our face
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G4PolyhedraSideEdge* edges = nullptr; // The edges belong to vecs
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G4double lenRZ, // RZ length of each side
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lenPhi[2]; // Phi dimensions of each side
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G4double edgeNorm; // Normal in RZ/Phi space to each side
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G4double kCarTolerance; // Geometrical surface thickness
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G4double fSurfaceArea = 0.0; // Surface Area
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G4int instanceID;
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// This field is used as instance ID.
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G4GEOM_DLL static G4PhSideManager subInstanceManager;
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// This field helps to use the class G4PhSideManager introduced above.
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};
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#endif
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