library: libGeom
#include "TGeoVolume.h" |
TGeoVolume
class description - source file - inheritance tree (.pdf)
public:
TGeoVolume()
TGeoVolume(const char* name, const TGeoShape* shape, const TGeoMedium* med = 0)
TGeoVolume(const TGeoVolume&)
virtual ~TGeoVolume()
virtual void AddNode(const TGeoVolume* vol, Int_t copy_no, TGeoMatrix* mat = 0, Option_t* option)
void AddNodeOffset(const TGeoVolume* vol, Int_t copy_no, Double_t offset = 0, Option_t* option)
virtual void AddNodeOverlap(const TGeoVolume* vol, Int_t copy_no, TGeoMatrix* mat = 0, Option_t* option)
virtual void Browse(TBrowser* b)
virtual void cd(Int_t inode) const
void CheckGeometry(Int_t nrays = 1, Double_t startx = 0, Double_t starty = 0, Double_t startz = 0) const
void CheckOverlaps(Double_t ovlp = 0.1, Option_t* option) const
void CheckShapes()
static TClass* Class()
void CleanAll()
void ClearNodes()
void ClearShape()
TGeoVolume* CloneVolume() const
Bool_t Contains(Double_t* point) const
Int_t CountNodes(Int_t nlevels = 1000, Int_t option = 0)
virtual Int_t DistancetoPrimitive(Int_t px, Int_t py)
virtual TGeoVolume* Divide(const char* divname, Int_t iaxis, Int_t ndiv, Double_t start, Double_t step, Int_t numed = 0, Option_t* option)
virtual void Draw(Option_t* option)
virtual void DrawOnly(Option_t* option)
virtual void ExecuteEvent(Int_t event, Int_t px, Int_t py)
Bool_t FindMatrixOfDaughterVolume(TGeoVolume* vol) const
TGeoNode* FindNode(const char* name) const
void FindOverlaps() const
virtual Int_t GetByteCount() const
TObject* GetField() const
TGeoPatternFinder* GetFinder() const
Int_t GetIndex(const TGeoNode* node) const
TGeoMaterial* GetMaterial() const
TGeoMedium* GetMedium() const
Int_t GetNdaughters() const
TGeoNode* GetNode(const char* name) const
TGeoNode* GetNode(Int_t i) const
Int_t GetNodeIndex(const TGeoNode* node, Int_t* check_list, Int_t ncheck) const
TObjArray* GetNodes()
Int_t GetNtotal() const
Int_t GetNumber()
virtual char* GetObjectInfo(Int_t px, Int_t py) const
Bool_t GetOptimalVoxels() const
virtual Option_t* GetOption() const
TGeoShape* GetShape() const
Char_t GetTransparency() const
TGeoVoxelFinder* GetVoxels() const
void GrabFocus()
void Gsord(Int_t)
void InspectMaterial() const
void InspectShape() const
void InvisibleAll(Bool_t flag = kTRUE)
virtual TClass* IsA() const
Bool_t IsAllInvisible() const
virtual Bool_t IsAssembly() const
Bool_t IsCylVoxels() const
virtual Bool_t IsFolder() const
Bool_t IsRaytracing() const
Bool_t IsRunTime() const
Bool_t IsStyleDefault() const
Bool_t IsTopVolume() const
Bool_t IsValid() const
Bool_t IsVisible() const
Bool_t IsVisibleDaughters() const
virtual Bool_t IsVolumeMulti() const
Bool_t IsXYZVoxels() const
TH2F* LegoPlot(Int_t ntheta = 20, Double_t themin = 0., Double_t themax = 180., Int_t nphi = 60, Double_t phimin = 0., Double_t phimax = 360., Double_t rmin = 0., Double_t rmax = 9999999, Option_t* option)
void* Make3DBuffer() const
void MakeCopyNodes(const TGeoVolume* other)
virtual TGeoVolume* MakeCopyVolume(TGeoShape* newshape)
TGeoVolume& operator=(const TGeoVolume&)
Bool_t OptimizeVoxels()
virtual void Paint(Option_t* option)
void PrintNodes() const
void PrintVoxels() const
void RandomPoints(Int_t npoints = 1000000, Option_t* option)
void RandomRays(Int_t nrays = 10000, Double_t startx = 0, Double_t starty = 0, Double_t startz = 0)
void Raytrace(Bool_t flag = kTRUE)
void SetAsTopVolume()
void SetCurrentPoint(Double_t x, Double_t y, Double_t z)
void SetCylVoxels(Bool_t flag = kTRUE)
void SetField(const TObject* field)
void SetFinder(const TGeoPatternFinder* finder)
void SetInvisible()
virtual void SetLineColor(Color_t lcolor)
virtual void SetLineStyle(Style_t lstyle)
virtual void SetLineWidth(Width_t lwidth)
virtual void SetMedium(const TGeoMedium* medium)
void SetNodes(TObjArray* nodes)
void SetNtotal(Int_t ntotal)
void SetNumber(Int_t number)
void SetOption(const char* option)
void SetShape(const TGeoShape* shape)
void SetTransparency(Char_t transparency = 0)
virtual void SetVisibility(Bool_t vis = kTRUE)
void SetVoxelFinder(const TGeoVoxelFinder* finder)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
void SortNodes()
virtual void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
Bool_t Valid() const
void VisibleDaughters(Bool_t vis = kTRUE)
void Voxelize(Option_t* option)
Double_t Weight(Double_t precision = 0.01, Option_t* option = "v")
protected:
TObjArray* fNodes array of nodes inside this volume
TGeoShape* fShape shape
TGeoMedium* fMedium tracking medium
TGeoPatternFinder* fFinder finder object for divisions
TGeoVoxelFinder* fVoxels finder object for bounding boxes
TObject* fField ! just a hook for now
TString fOption ! option - if any
Int_t fNumber volume serial number in the list of volumes
Int_t fNtotal total number of physical nodes
public:
static const TGeoVolume::EGeoVolumeTypes kVolumeDiv
static const TGeoVolume::EGeoVolumeTypes kVolumeOverlap
static const TGeoVolume::EGeoVolumeTypes kVolumeImportNodes
static const TGeoVolume::EGeoVolumeTypes kVolumeMulti
static const TGeoVolume::EGeoVolumeTypes kVoxelsXYZ
static const TGeoVolume::EGeoVolumeTypes kVoxelsCyl
static const TGeoVolume::EGeoVolumeTypes kVolumeClone
TGeoVolume - the base class representing solids.
Volumes are the basic objects used in building the geometrical hierarchy.
They represent unpositioned objects but store all information about the
placement of the other volumes they may contain. Therefore a volume can
be replicated several times in the geometry. In order to create a volume, one
has to put togeather a shape and a medium which are already defined. Volumes
have to be named by users at creation time. Every different name may represent a
an unique volume object, but may also represent more general a family (class)
of volume objects having the same shape type and medium, but possibly
different shape parameters. It is the user's task to provide different names
for different volume families in order to avoid ambiguities at tracking time.
A generic family rather than a single volume is created only in two cases :
when a generic shape is provided to the volume constructor or when a division
operation is applied. Each volume in the geometry stores an unique
ID corresponding to its family. In order to ease-up their creation, the manager
class is providing an API that allows making a shape and a volume in a single step.
Volumes are objects that can be visualized, therefore having visibility,
colour, line and fill attributes that can be defined or modified any time after
the volume creation. It is advisable however to define these properties just
after the first creation of a volume namespace, since in case of volume families
any new member created by the modeler inherits these properties.
In order to provide navigation features, volumes have to be able to find
the proper container of any point defined in the local reference frame. This
can be the volume itself, one of its positioned daughter volumes or none if
the point is actually outside. On the other hand, volumes have to provide also
other navigation methods such as finding the distances to its shape boundaries
or which daughter will be crossed first. The implementation of these features
is done at shape level, but the local mother-daughters management is handled
by volumes that builds additional optimisation structures upon geometry closure.
In order to have navigation features properly working one has to follow the
general rules for building a valid geometry (see TGeoManager class).
Now let's make a simple volume representing a copper wire. We suppose that
a medium is already created (see TGeoMedium class on how to create media).
We will create a TUBE shape for our wire, having Rmin=0cm, Rmax=0.01cm
and a half-length dZ=1cm :
TGeoTube *tube = new TGeoTube("wire_tube", 0, 0.01, 1);
One may ommit the name for the shape if no retreiving by name is further needed
during geometry building. The same shape can be shared by different volumes
having different names and materials. Now let's make the volume for our wire.
The prototype for volumes constructor looks like :
TGeoVolume::TGeoVolume(const char *name, TGeoShape *shape, TGeoMedium *med)
Since TGeoTube derives brom the base shape class, we can provide it to the volume
constructor :
TGeoVolume *wire_co = new TGeoVolume("WIRE_CO", tube, ptrCOPPER);
Do not bother to delete neither the media, shapes or volumes that you have
created since all will be automatically cleaned on exit by the manager class.
If we would have taken a look inside TGeoManager::MakeTube() method, we would
have been able to create our wire with a single line :
TGeoVolume *wire_co = gGeoManager->MakeTube("WIRE_CO", ptrCOPPER, 0, 0.01, 1);
The same applies for all primitive shapes, for which there can be found
corresponding MakeSHAPE() methods. Their usage is much more convenient unless
a shape has to be shared between more volumes. Let's make now an aluminium wire
having the same shape, supposing that we have created the copper wire with the
line above :
TGeoVolume *wire_al = new TGeoVolume("WIRE_AL", wire_co->GetShape(), ptrAL);
Now that we have learned how to create elementary volumes, let's see how we
can create a geometrical hierarchy.
Positioning volumes
-----------------------
When creating a volume one does not specify if this will contain or not other
volumes. Adding daughters to a volume implies creating those and adding them
one by one to the list of daughters. Since the volume has to know the position
of all its daughters, we will have to supply at the same time a geometrical
transformation with respect to its local reference frame for each of them.
The objects referencing a volume and a transformation are called NODES and
their creation is fully handled by the modeler. They represent the link
elements in the hierarchy of volumes. Nodes are unique and distinct geometrical
objects ONLY from their container point of view. Since volumes can be replicated
in the geometry, the same node may be found on different branches.
/*
*/
An important observation is that volume objects are owned by the TGeoManager
class. This stores a list of all volumes in the geometry, that is cleaned
upon destruction.
Let's consider positioning now our wire in the middle of a gas chamber. We
need first to define the gas chamber :
TGeoVolume *chamber = gGeoManager->MakeTube("CHAMBER", ptrGAS, 0, 1, 1);
Now we can put the wire inside :
chamber->AddNode(wire_co, 1);
If we inspect now the chamber volume in a browser, we will notice that it has
one daughter. Of course the gas has some container also, but let's keep it like
that for the sake of simplicity. The full prototype of AddNode() is :
TGeoVolume::AddNode(TGeoVolume *daughter, Int_t usernumber,
TGeoMatrix *matrix=gGeoIdentity)
Since we did not supplied the third argument, the wire will be positioned with
an identity transformation inside the chamber. One will notice that the inner
radii of the wire and chamber are both zero - therefore, aren't the two volumes
overlapping ? The answer is no, the modeler is even relaying on the fact that
any daughter is fully contained by its mother. On the other hand, neither of
the nodes positioned inside a volume should overlap with each other. We will
see that there are allowed some exceptions to those rules.
Overlapping volumes
--------------------
Positioning volumes that does not overlap their neighbours nor extrude
their container is sometimes quite strong contrain. Some parts of the geometry
might overlap naturally, e.g. two crossing tubes. The modeller supports such
cases only if the overlapping nodes are declared by the user. In order to do
that, one should use TGeoVolume::AddNodeOverlap() instead of TGeoVolume::AddNode().
When 2 or more positioned volumes are overlapping, not all of them have to
be declared so, but at least one. A point inside an overlapping region equally
belongs to all overlapping nodes, but the way these are defined can enforce
the modeler to give priorities.
The general rule is that the deepest node in the hierarchy containing a point
have the highest priority. For the same geometry level, non-overlapping is
prioritized over overlapping. In order to illustrate this, we will consider
few examples. We will designate non-overlapping nodes as ONLY and the others
MANY as in GEANT3, where this concept was introduced:
1. The part of a MANY node B extruding its container A will never be "seen"
during navigation, as if B was in fact the result of the intersection of A and B.
2. If we have two nodes A (ONLY) and B (MANY) inside the same container, all
points in the overlapping region of A and B will be designated as belonging to A.
3. If A an B in the above case were both MANY, points in the overlapping
part will be designated to the one defined first. Both nodes must have the
same medium.
4. The silces of a divided MANY will be as well MANY.
One needs to know that navigation inside geometry parts MANY nodes is much
slower. Any overlapping part can be defined based on composite shapes - this
is always recommended.
TGeoVolume()
dummy constructor
TGeoVolume(const char *name, const TGeoShape *shape, const TGeoMedium *med)
:TNamed(name, "")
default constructor
~TGeoVolume()
Destructor
void Browse(TBrowser *b)
How to browse a volume
void CheckGeometry(Int_t nrays, Double_t startx, Double_t starty, Double_t startz) const
Shoot nrays with random directions from starting point (startx, starty, startz)
in the reference frame of this volume. Track each ray until exiting geometry, then
shoot backwards from exiting point and compare boundary crossing points.
void CheckOverlaps(Double_t ovlp, Option_t *option) const
Overlap checking tool. Check for illegal overlaps within a limit OVLP.
void CleanAll()
void ClearShape()
void CheckShapes()
check for negative parameters in shapes.
THIS METHOD LEAVES SOME GARBAGE NODES -> memory leak, to be fixed
printf("---Checking daughters of volume %s\n", GetName());
Int_t CountNodes(Int_t nlevels, Int_t option)
Count total number of subnodes starting from this volume, nlevels down
option = 0 (default) - count only once per volume
option = 1 - count every time
option = 2 - count volumes on visible branches
Bool_t IsFolder() const
Return TRUE if volume contains nodes
Bool_t IsStyleDefault() const
check if the visibility and attributes are the default ones
Bool_t IsTopVolume() const
True if this is the top volume of the geometry
Bool_t IsRaytracing() const
void InspectMaterial() const
void cd(Int_t inode) const
Actualize matrix of node indexed <inode>
void AddNode(const TGeoVolume *vol, Int_t copy_no, TGeoMatrix *mat, Option_t * /*option*/)
Add a TGeoNode to the list of nodes. This is the usual method for adding
daughters inside the container volume.
void AddNodeOffset(const TGeoVolume *vol, Int_t copy_no, Double_t offset, Option_t * /*option*/)
Add a division node to the list of nodes. The method is called by
TGeoVolume::Divide() for creating the division nodes.
void AddNodeOverlap(const TGeoVolume *vol, Int_t copy_no, TGeoMatrix *mat, Option_t * /*option*/)
Add a TGeoNode to the list of nodes. This is the usual method for adding
daughters inside the container volume.
TGeoVolume* Divide(const char *divname, Int_t iaxis, Int_t ndiv, Double_t start, Double_t step, Int_t numed, Option_t *option)
Division a la G3. The volume will be divided along IAXIS (see shape classes), in NDIV
slices, from START with given STEP. The division volumes will have medium number NUMED.
If NUMED=0 they will get the medium number of the divided volume (this). If NDIV<=0,
all range of IAXIS will be divided and the resulting number of divisions will be centered on
IAXIS. If STEP<=0, the real STEP will be computed as the full range of IAXIS divided by NDIV.
Options (case insensitive):
N - divide all range in NDIV cells (same effect as STEP<=0) (GSDVN in G3)
NX - divide range starting with START in NDIV cells (GSDVN2 in G3)
S - divide all range with given STEP. NDIV is computed and divisions will be centered
in full range (same effect as NDIV<=0) (GSDVS, GSDVT in G3)
SX - same as DVS, but from START position. (GSDVS2, GSDVT2 in G3)
Int_t DistancetoPrimitive(Int_t px, Int_t py)
compute the closest distance of approach from point px,py to this volume
void Draw(Option_t *option)
draw top volume according to option
void DrawOnly(Option_t *option)
draw only this volume
Bool_t OptimizeVoxels()
Perform an exensive sampling to find which type of voxelization is
most efficient.
void Paint(Option_t *option)
paint volume
void PrintVoxels() const
void PrintNodes() const
print nodes
TH2F* LegoPlot(Int_t ntheta, Double_t themin, Double_t themax,
Int_t nphi, Double_t phimin, Double_t phimax,
Double_t rmin, Double_t rmax, Option_t *option)
Generate a lego plot fot the top volume, according to option.
void RandomPoints(Int_t npoints, Option_t *option)
Draw random points in the bounding box of this volume.
void RandomRays(Int_t nrays, Double_t startx, Double_t starty, Double_t startz)
Random raytracing method.
void Raytrace(Bool_t flag)
Draw this volume with current settings and perform raytracing in the pad.
void ExecuteEvent(Int_t event, Int_t px, Int_t py)
Execute mouse actions on this volume.
TGeoNode* FindNode(const char *name) const
search a daughter inside the list of nodes
Int_t GetNodeIndex(const TGeoNode *node, Int_t *check_list, Int_t ncheck) const
Int_t GetIndex(const TGeoNode *node) const
get index number for a given daughter
char* GetObjectInfo(Int_t px, Int_t py) const
Bool_t GetOptimalVoxels() const
--- Returns true if cylindrical voxelization is optimal.
void GrabFocus()
Move perspective view focus to this volume
TGeoVolume* CloneVolume() const
void MakeCopyNodes(const TGeoVolume *other)
make a new list of nodes and copy all nodes of other volume inside
TGeoVolume* MakeCopyVolume(TGeoShape *newshape)
make a copy of this volume
printf(" Making a copy of %s\n", GetName());
void SetAsTopVolume()
void SetCurrentPoint(Double_t x, Double_t y, Double_t z)
void SetShape(const TGeoShape *shape)
set the shape associated with this volume
void SortNodes()
sort nodes by decreasing volume of the bounding box. ONLY nodes comes first,
then overlapping nodes and finally division nodes.
void Streamer(TBuffer &R__b)
Stream an object of class TGeoVolume.
void SetOption(const char * /*option*/)
set the current options
void SetLineColor(Color_t lcolor)
void SetLineStyle(Style_t lstyle)
void SetLineWidth(Style_t lwidth)
TGeoNode* GetNode(const char *name) const
get the pointer to a daughter node
Int_t GetByteCount() const
get the total size in bytes for this volume
void FindOverlaps() const
loop all nodes marked as overlaps and find overlaping brothers
void SetVisibility(Bool_t vis)
set visibility of this volume
Bool_t Valid() const
Bool_t FindMatrixOfDaughterVolume(TGeoVolume *vol) const
Find a daughter node having VOL as volume and fill TGeoManager::fHMatrix
with its global matrix.
void VisibleDaughters(Bool_t vis)
set visibility for daughters
void Voxelize(Option_t *option)
build the voxels for this volume
Double_t Weight(Double_t precision, Option_t *option)
Estimate the weight of a volume with SIGMA(M)/M better than PRECISION.
Option can be : v - verbose (default)
Inline Functions
void ClearNodes()
Bool_t Contains(Double_t* point) const
Bool_t IsAssembly() const
Bool_t IsRunTime() const
Bool_t IsVolumeMulti() const
Bool_t IsCylVoxels() const
Bool_t IsXYZVoxels() const
Bool_t IsValid() const
Bool_t IsVisible() const
Bool_t IsVisibleDaughters() const
Bool_t IsAllInvisible() const
TObjArray* GetNodes()
Int_t GetNdaughters() const
Int_t GetNtotal() const
TGeoMaterial* GetMaterial() const
TGeoMedium* GetMedium() const
TObject* GetField() const
TGeoPatternFinder* GetFinder() const
TGeoVoxelFinder* GetVoxels() const
TGeoNode* GetNode(Int_t i) const
Int_t GetNumber()
Option_t* GetOption() const
Char_t GetTransparency() const
TGeoShape* GetShape() const
void Gsord(Int_t)
void InspectShape() const
void* Make3DBuffer() const
void SetCylVoxels(Bool_t flag = kTRUE)
void SetNodes(TObjArray* nodes)
void SetTransparency(Char_t transparency = 0)
void SetField(const TObject* field)
void SetInvisible()
void SetMedium(const TGeoMedium* medium)
void SetVoxelFinder(const TGeoVoxelFinder* finder)
void SetFinder(const TGeoPatternFinder* finder)
void SetNumber(Int_t number)
void SetNtotal(Int_t ntotal)
void InvisibleAll(Bool_t flag = kTRUE)
TClass* Class()
TClass* IsA() const
void ShowMembers(TMemberInspector& insp, char* parent)
void StreamerNVirtual(TBuffer& b)
TGeoVolume TGeoVolume(const TGeoVolume&)
TGeoVolume& operator=(const TGeoVolume&)
Author: Andrei Gheata 30/05/02
Last update: root/geom:$Name: $:$Id: TGeoVolume.cxx,v 1.50 2004/11/19 06:39:54 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
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