class description - source file - inheritance tree

class TGeoNodeMatrix : public TGeoNode

TGeoNodeMatrix TGeoNodeMatrix() TGeoNodeMatrix TGeoNodeMatrix(const TGeoVolume* vol, const TGeoMatrix* matrix) TGeoNodeMatrix TGeoNodeMatrix(const TGeoNodeMatrix&) virtual void ~TGeoNodeMatrix() static TClass* Class() virtual Int_t GetByteCount() const virtual TGeoMatrix* GetMatrix() const virtual Int_t GetOptimalVoxels() const virtual TClass* IsA() const virtual Bool_t IsFolder() const virtual TGeoNode* MakeCopyNode() const void SetMatrix(const TGeoMatrix* matrix) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

Data Members

TGeoMatrix* fMatrix transf. matrix of fNode in fMother system

Class Description

   Nodes are positioned volumes. They have a pointer to the corresponding
 volume. Nodes always belong to a mother container volume, so they also
 have a pointer to this. The base class for nodes is TGeoNode, describing only
 the logical tree. The position of the node with respect to its mother is
 defined by classes deriving from TGeoNode and is stored as a transformation
 matrix by TGeoNodeMatrix or just an offset by division nodes (TGeoNodeXXX).
   Nodes are invisible to user at build time : to create a node one has only
 to call TGeoVolume::AddNode() or TGeoVolume::Divide() methods. In the first
 case, the volume pointed by the node and the geometrical transformation with
 respect to the mother must be created a priori :

   TGeoVolume *vol = new TGeoSphere("SPH", 200, 400);
   TGeoVolume *mother = gGeoManager->MakeBox("HALL", "mat1", 1000, 1000, 3000);
   TGeoTranslation *t1 = new TGeoTranslation(0, 0, 300);
   mother->AddNode(vol, t1);

   The last line will create a branch : HALL->SPH . A node named SPH:0 will
 be created. If trying to place the same volume many times inside the same
 mother, the automatic naming scheme for the corresponding nodes is just
 appending <:copy_number> to the name of the volume. Therefore :

   TGeoTranslation *t2 = new TGeoTranslation(0,0,-300);
   mother->AddNode(vol, t2);

 will create a TGeoNodeMatrix named SPH:1 inside HALL.

   When creating division nodes (TGeoVolume::Divide()), one has to specify the
 number of divisions, optionally the range for dividing and an string option
 specifying the division type. A list of TGeoNodeOffset will be generated :

   mother->Divide(5, "X");

 will create five TGeoNodeOffset nodes, pointing to the same basic cell volume
 which is automatically generated :

   HALL:0 --|
   HALL:1 --|
   HALL:2 --|---> HALL_C = gGeoManager->MakeBox("HALL_C", "mat1", 200, 1000, 3000)
   HALL:3 --|
   HALL:4 --|

   One can subsequently add usual nodes inside HALL_C cell or divide it, and the
 action will affect all nodes HALL:i .
   If the basic cell volumes coming from a division operation are not identical,
 a volume will be generated per division node, and the naming sheme for them
 will be HALL_d1, HALL_d2, ... .

 Browsing nodes. (to be added)

 Node flags.(to be added)



 Default constructor

TGeoNodeMatrix(const TGeoVolume *vol, const TGeoMatrix *matrix) : TGeoNode(vol)
 Constructor. Null pointer to matrix means identity transformation


Int_t GetByteCount() const
 return the total size in bytes of this node

Int_t GetOptimalVoxels() const
--- Returns type of optimal voxelization for this node.
 type = 0 -> cartesian
 type = 1 -> cylindrical

TGeoNode* MakeCopyNode() const
 make a copy of this node
   printf("      Making a copy of node %sn", GetName());

Inline Functions

                Bool_t IsFolder() const
           TGeoMatrix* GetMatrix() const
                  void SetMatrix(const TGeoMatrix* matrix)
               TClass* Class()
               TClass* IsA() const
                  void ShowMembers(TMemberInspector& insp, char* parent)
                  void Streamer(TBuffer& b)
                  void StreamerNVirtual(TBuffer& b)
        TGeoNodeMatrix TGeoNodeMatrix(const TGeoNodeMatrix&)

Author: Andrei Gheata 24/10/01
Last update: root/geom:$Name: $:$Id: TGeoNode.cxx,v 1.17 2003/01/27 13:16:26 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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