Gabriele Cosmo
307 lines
12 KiB
C++
307 lines
12 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// $Id$
|
|
//
|
|
//
|
|
// --------------------------------------------------------------------
|
|
// GEANT 4 class header file
|
|
//
|
|
//
|
|
// G4VCSGface
|
|
//
|
|
// Class description:
|
|
//
|
|
// Definition of the virtual base class G4VCSGface, one side (or face)
|
|
// of a CSG-like solid. It should be possible to build a CSG entirely out of
|
|
// connecting CSG faces.
|
|
//
|
|
// Each face has an inside and outside surface, the former represents
|
|
// the inside of the volume, the latter, the outside.
|
|
//
|
|
// Virtual members:
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Intersect( const G4ThreeVector &p, const G4ThreeVector &v,
|
|
// G4bool outGoing, G4double surfTolerance,
|
|
// G4double &distance, G4double &distFromSurface,
|
|
// G4ThreeVector &normal, G4bool &allBehind );
|
|
//
|
|
// p - (in) position
|
|
// v - (in) direction (assumed to be a unit vector)
|
|
// outgoing - (in) true, to consider only inside surfaces
|
|
// false, to consider only outside surfaces
|
|
// distance - (out) distance to intersection
|
|
// distFromSurface - (out) distance from surface (along surface normal),
|
|
// < 0 if the point is in front of the surface
|
|
// normal - (out) normal of surface at intersection point
|
|
// allBehind - (out) true, if entire surface is behind normal
|
|
//
|
|
// return value = true if there is an intersection,
|
|
// false if there is no intersection
|
|
// (all output arguments undefined)
|
|
//
|
|
// Determine the distance along a line to the face.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Distance( const G4ThreeVector &p, const G4bool outgoing );
|
|
//
|
|
// p - (in) position
|
|
// outgoing - (in) true, to consider only inside surfaces
|
|
// false, to consider only outside surfaces
|
|
//
|
|
// return value = distance to closest surface satisifying requirements
|
|
// or kInfinity if no such surface exists
|
|
//
|
|
// Determine the distance of a point from either the inside or outside
|
|
// surfaces of the face.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Inside( const G4ThreeVector &p, const G4double tolerance,
|
|
// G4double *bestDistance );
|
|
//
|
|
// p - (in) position
|
|
// tolerance - (in) tolerance defining the bounds of the "kSurface",
|
|
// nominally equal to kCarTolerance/2
|
|
// bestDistance - (out) distance to closest surface (in or out)
|
|
//
|
|
// return value = kInside if the point is closest to the inside surface
|
|
// kOutside if the point is closest to the outside surface
|
|
// kSurface if the point is withing tolerance of the surface
|
|
//
|
|
// Determine whether a point is inside, outside, or on the surface of
|
|
// the face.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Normal( const G4ThreeVector &p, G4double *bestDistance );
|
|
//
|
|
// p - (in) position
|
|
// bestDistance - (out) distance to closest surface (in or out)
|
|
//
|
|
// return value = the normal of the surface nearest the point
|
|
//
|
|
// Return normal of surface closest to the point.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Extent( const G4ThreeVector axis );
|
|
//
|
|
// axis - (in) unit vector defining direction
|
|
//
|
|
// return value = the largest point along the given axis of the
|
|
// the face's extent.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// CalculateExtent( const EAxis pAxis,
|
|
// const G4VoxelLimit &pVoxelLimit,
|
|
// const G4AffineTransform &pTransform,
|
|
// G4double &min, G4double &max )
|
|
//
|
|
// pAxis - (in) The x,y, or z axis in which to check
|
|
// the shapes 3D extent against
|
|
// pVoxelLimit - (in) Limits along x, y, and/or z axes
|
|
// pTransform - (in) A coordinate transformation on which
|
|
// to apply to the shape before testing
|
|
// min - (out) If the face has any point on its
|
|
// surface after tranformation and limits
|
|
// along pAxis that is smaller than the value
|
|
// of min, than it is used to replace min.
|
|
// Undefined if the return value is false.
|
|
// max - (out) Same as min, except for the largest
|
|
// point.
|
|
// Undefined if the return value is false.
|
|
//
|
|
// return value = true if anything remains of the face
|
|
//
|
|
// Calculate the extent of the face for the voxel navigator.
|
|
// In analogy with CalculateExtent for G4VCSGfaceted, this is
|
|
// done in the following steps:
|
|
//
|
|
// 1. Transform the face using pTranform, an arbitrary 3D
|
|
// rotation/offset/reflection
|
|
// 2. Clip the face to those boundaries as specified in
|
|
// pVoxelLimit. This may include limits in any number
|
|
// of x, y, or z axes.
|
|
// 3. For each part of the face that remains (there could
|
|
// be many separate pieces in general):
|
|
// 4. Check to see if the piece overlaps the currently
|
|
// existing limits along axis pAxis. For
|
|
// pVoxelLimit.IsLimited(pAxis) = false, there are
|
|
// no limits.
|
|
// 5. For a piece that does overlap, update min/max
|
|
// accordingly (within confines of pre-existing
|
|
// limits) along the direction pAxis.
|
|
// 6. If min/max were updated, return true
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// G3VCSGface *Clone()
|
|
//
|
|
// This method is invoked by G4CSGfaceted during the copy constructor
|
|
// or the assignment operator. Its purpose is to return a pointer
|
|
// (of type G4VCSGface) to a duplicate copy of the face.
|
|
// The implementation is straight forward for inherited classes. Example:
|
|
//
|
|
// G4VCSGface G4PolySideFace::Clone() { return new G4PolySideFace(*this); }
|
|
//
|
|
// Of course, this assumes the copy constructor of G4PolySideFace is
|
|
// correctly implemented.
|
|
//
|
|
// Implementation notes:
|
|
// * distance.
|
|
// The meaning of distance includes the boundaries of the face.
|
|
// For example, for a rectangular, planer face:
|
|
//
|
|
// A | B | C
|
|
// | |
|
|
// -------+--------------+-----
|
|
// D | I | E
|
|
// | |
|
|
// -------+--------------+-----
|
|
// F | G | H
|
|
// | |
|
|
//
|
|
// A, C, F, and H: closest distance is the distance to
|
|
// the adjacent corner.
|
|
//
|
|
// B, D, E, and G: closest distance is the distance to
|
|
// the adjacent line.
|
|
//
|
|
// I: normal distance to plane
|
|
//
|
|
// For non-planer faces, one can use the normal to decide when
|
|
// a point falls off the edge and then act accordingly.
|
|
//
|
|
//
|
|
// Usage:
|
|
//
|
|
// A CSG shape can be defined by putting together any number of generic
|
|
// faces, as long as the faces cover the entire surface of the shape
|
|
// without overlapping.
|
|
//
|
|
// G4VSolid::CalculateExtent
|
|
//
|
|
// Define unit vectors along the specified transform axis.
|
|
// Use the inverse of the specified coordinate transformation to rotate
|
|
// these unit vectors. Loop over each face, call face->Extent, and save
|
|
// the maximum value.
|
|
//
|
|
// G4VSolid::Inside
|
|
//
|
|
// To decide if a point is inside, outside, or on the surface of the shape,
|
|
// loop through all faces, and find the answer from face->Inside which gives
|
|
// a value of "bestDistance" smaller than any other. While looping, if any
|
|
// face->Inside returns kSurface, this value can be returned immediately.
|
|
//
|
|
// EInside answer;
|
|
// G4VCSGface *face = faces;
|
|
// G4double best = kInfinity;
|
|
// do {
|
|
// G4double distance;
|
|
// EInside result = (*face)->Inside( p, kCarTolerance/2, distance );
|
|
// if (result == kSurface) return kSurface;
|
|
// if (distance < best) {
|
|
// best = distance;
|
|
// answer = result;
|
|
// }
|
|
// } while( ++face < faces + numFaces );
|
|
//
|
|
// return(answer);
|
|
//
|
|
// G4VSolid::SurfaceNormal
|
|
//
|
|
// Loop over all faces, call face->Normal, and return the normal to the face
|
|
// that is closest to the point.
|
|
//
|
|
// G4VSolid::DistanceToIn(p)
|
|
//
|
|
// Loop over all faces, invoking face->Distance with outgoing = false,
|
|
// and save the answer that is smallest.
|
|
//
|
|
// G4VSolid::DistanceToIn(p,v)
|
|
//
|
|
// Loop over all faces, invoking face->Intersect with outgoing = false,
|
|
// and save the answer that is smallest.
|
|
//
|
|
// G4VSolid::DistanceToOut(p)
|
|
//
|
|
// Loop over all faces, invoking face->Distance with outgoing = true,
|
|
// and save the answer that is smallest.
|
|
//
|
|
// G4VSolid::DistanceToOut(p,v)
|
|
//
|
|
// Loop over all faces, invoking face->Intersect with outgoing = true,
|
|
// and save the answer that is smallest. If there is more than one answer,
|
|
// or if allBehind is false for the one answer, return validNorm as false.
|
|
|
|
// Author:
|
|
// David C. Williams (davidw@scipp.ucsc.edu)
|
|
// --------------------------------------------------------------------
|
|
#ifndef G4VCSGface_hh
|
|
#define G4VCSGface_hh
|
|
|
|
#include "G4Types.hh"
|
|
#include "G4ThreeVector.hh"
|
|
#include "geomdefs.hh"
|
|
#include "G4VSolid.hh"
|
|
|
|
class G4VoxelLimits;
|
|
class G4AffineTransform;
|
|
class G4SolidExtentList;
|
|
|
|
class G4VCSGface
|
|
{
|
|
public: // with description
|
|
|
|
G4VCSGface() {}
|
|
virtual ~G4VCSGface() {}
|
|
|
|
virtual G4bool Intersect( const G4ThreeVector &p, const G4ThreeVector &v,
|
|
G4bool outgoing, G4double surfTolerance,
|
|
G4double &distance, G4double &distFromSurface,
|
|
G4ThreeVector &normal, G4bool &allBehind ) = 0;
|
|
|
|
virtual G4double Distance( const G4ThreeVector &p, G4bool outgoing ) = 0;
|
|
|
|
virtual EInside Inside( const G4ThreeVector &p, G4double tolerance,
|
|
G4double *bestDistance ) = 0;
|
|
|
|
virtual G4ThreeVector Normal( const G4ThreeVector &p,
|
|
G4double *bestDistance ) = 0;
|
|
|
|
virtual G4double Extent( const G4ThreeVector axis ) = 0;
|
|
|
|
virtual void CalculateExtent( const EAxis axis,
|
|
const G4VoxelLimits &voxelLimit,
|
|
const G4AffineTransform &tranform,
|
|
G4SolidExtentList &extentList ) = 0;
|
|
|
|
virtual G4VCSGface* Clone() = 0;
|
|
|
|
virtual G4double SurfaceArea( ) = 0;
|
|
virtual G4ThreeVector GetPointOnFace() = 0;
|
|
};
|
|
|
|
#endif
|