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16 /** @file AliFMDGeometry.cxx
17 @author Christian Holm Christensen <cholm@nbi.dk>
18 @date Mon Mar 27 12:40:37 2006
19 @brief Geometry mananger for the FMD
21 //____________________________________________________________________
23 // Forward Multiplicity Detector based on Silicon wafers.
25 // This class is a singleton that handles the geometry parameters of
28 // The actual code is done by various separate classes. Below is
29 // diagram showing the relationship between the various FMD classes
30 // that handles the geometry
35 // +----------------+<>--+ |
36 // | AliFMDGeometry | ^
37 // +----------------+<>--+ V 1..2
38 // 3 | +----------------+
39 // +-| AliFMDDetector |
43 // +-------------+-------------+
45 // +---------+ +---------+ +---------+
46 // | AliFMD1 | | AliFMD2 | | AliFMD3 |
47 // +---------+ +---------+ +---------+
51 // This class contains all stuff needed to do with a ring. It's
52 // used by the AliFMDDetector objects to instantise inner and
53 // outer rings. The AliFMDRing objects are shared by the
54 // AliFMDDetector objects, and owned by the AliFMDv1 object.
56 // * AliFMD1, AliFMD2, and AliFMD3
57 // These are specialisation of AliFMDDetector, that contains the
58 // particularities of each of the sub-detector system. It is
59 // envisioned that the classes should also define the support
60 // volumes and material for each of the detectors.
63 #include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H
64 #include "AliFMDRing.h" // ALIFMDRING_H
65 #include "AliFMD1.h" // ALIFMD1_H
66 #include "AliFMD2.h" // ALIFMD2_H
67 #include "AliFMD3.h" // ALIFMD2_H
68 #include "AliRecPoint.h" // ALIRECPOINT_H
69 #include "AliLog.h" // ALIRECPOINT_H
70 #include <TVector3.h> // ROOT_TVector3
71 // #include <TMatrix.h> // ROOT_TMatrix
72 // #include <TParticle.h> // ROOT_TParticle
73 #include <Riostream.h>
74 #include "AliFMDGeometryBuilder.h"
75 // #include <TArrayI.h>
76 #include <TGeoManager.h>
77 #include <TGeoVolume.h>
79 static Int_t FindNodeDepth(const char* name, const char* volname);
82 //====================================================================
83 ClassImp(AliFMDGeometry)
85 ; // This is here to keep Emacs for indenting the next line
88 //____________________________________________________________________
89 AliFMDGeometry* AliFMDGeometry::fgInstance = 0;
91 //____________________________________________________________________
93 AliFMDGeometry::Instance()
95 // Return (newly created) singleton instance
96 if (!fgInstance) fgInstance = new AliFMDGeometry;
100 //____________________________________________________________________
101 AliFMDGeometry::AliFMDGeometry()
102 : AliGeometry("FMD", "Forward multiplicity"),
106 // Default constructor
111 fUseAssembly = kTRUE;
112 fInner = new AliFMDRing('I');
113 fOuter = new AliFMDRing('O');
114 fFMD1 = new AliFMD1(fInner);
115 fFMD2 = new AliFMD2(fInner, fOuter);
116 fFMD3 = new AliFMD3(fInner, fOuter);
117 fIsInitialized = kFALSE;
121 //____________________________________________________________________
122 AliFMDGeometry::AliFMDGeometry(const AliFMDGeometry& other)
123 : AliGeometry(other),
124 fIsInitialized(other.fIsInitialized),
125 fInner(other.fInner),
126 fOuter(other.fOuter),
130 fUseFMD1(other.fUseFMD1),
131 fUseFMD2(other.fUseFMD2),
132 fUseFMD3(other.fUseFMD3),
133 fActive(other.fActive),
134 fDetailed(other.fDetailed),
135 fUseAssembly(other.fUseAssembly)
143 //____________________________________________________________________
145 AliFMDGeometry::operator=(const AliFMDGeometry& other)
148 // Assignment operator
149 fUseFMD1 = other.fUseFMD1;
150 fUseFMD2 = other.fUseFMD2;
151 fUseFMD3 = other.fUseFMD3;
155 fInner = other.fInner;
156 fOuter = other.fOuter;
157 fIsInitialized = other.fIsInitialized;
161 //____________________________________________________________________
163 AliFMDGeometry::Init()
165 // Initialize the the singleton if not done so already
166 if (fIsInitialized) return;
174 //____________________________________________________________________
176 AliFMDGeometry::InitTransformations()
178 // Find all local <-> global transforms
180 AliError("No TGeoManager defined");
183 AliDebug(0, "Initialising transforms for FMD geometry");
184 if (fFMD1) fFMD1->InitTransformations();
185 if (fFMD2) fFMD2->InitTransformations();
186 if (fFMD3) fFMD3->InitTransformations();
189 //____________________________________________________________________
191 AliFMDGeometry::Build()
193 // Build the geometry
194 if (!fBuilder) fBuilder = new AliFMDGeometryBuilder(fDetailed);
195 fBuilder->SetDetailed(fDetailed);
196 fBuilder->UseAssembly(fUseAssembly);
200 //____________________________________________________________________
202 AliFMDGeometry::SetActive(Int_t* active, Int_t n)
204 // Set active volumes
206 for (Int_t i = 0; i < n; i++) {
207 AliDebug(1, Form("Active vol id # %d: %d", i, active[i]));
208 fActive[i] = active[i];
212 //____________________________________________________________________
214 AliFMDGeometry::AddActive(Int_t active)
216 // Add an active volume
217 Int_t n = fActive.fN;
222 //____________________________________________________________________
224 AliFMDGeometry::IsActive(Int_t vol) const
226 // Check if a volume is active
227 for (Int_t i = 0; i < fActive.fN; i++)
228 if (fActive[i] == vol) return kTRUE;
232 //____________________________________________________________________
234 AliFMDGeometry::GetDetector(Int_t i) const
236 // Get the ith detector. i should be one of 1, 2, or 3. If an
237 // invalid value is passed, 0 (NULL) is returned.
239 case 1: return fUseFMD1 ? static_cast<AliFMDDetector*>(fFMD1) : 0;
240 case 2: return fUseFMD2 ? static_cast<AliFMDDetector*>(fFMD2) : 0;
241 case 3: return fUseFMD3 ? static_cast<AliFMDDetector*>(fFMD3) : 0;
246 //____________________________________________________________________
248 AliFMDGeometry::GetRing(Char_t i) const
250 // Get the ith ring. i should be one of 'I' or 'O' (case
251 // insensitive). If an invalid parameter is passed, 0 (NULL) is
255 case 'i': return fInner;
257 case 'o': return fOuter;
262 //____________________________________________________________________
264 AliFMDGeometry::Enable(Int_t i)
266 // Enable the ith detector. i should be one of 1, 2, or 3
268 case 1: fUseFMD1 = kTRUE; break;
269 case 2: fUseFMD2 = kTRUE; break;
270 case 3: fUseFMD3 = kTRUE; break;
274 //____________________________________________________________________
276 AliFMDGeometry::Disable(Int_t i)
278 // Disable the ith detector. i should be one of 1, 2, or 3
280 case 1: fUseFMD1 = kFALSE; break;
281 case 2: fUseFMD2 = kFALSE; break;
282 case 3: fUseFMD3 = kFALSE; break;
286 //____________________________________________________________________
288 AliFMDGeometry::Detector2XYZ(UShort_t detector,
296 // Translate detector coordinates (detector, ring, sector, strip) to
297 // spatial coordinates (x, y, z) in the master reference frame of
299 AliFMDDetector* det = GetDetector(detector);
301 AliWarning(Form("Unknown detector %d", detector));
304 det->Detector2XYZ(ring, sector, strip, x, y, z);
307 //____________________________________________________________________
309 AliFMDGeometry::XYZ2Detector(Double_t x,
315 UShort_t& strip) const
317 // Translate spatial coordinates (x,y,z) in the master reference frame of
318 // ALICE to the detector coordinates (detector, ring, sector,
319 // strip). Note, that if this method is to be used in
320 // reconstruction or the like, then the input z-coordinate should be
321 // corrected for the events interactions points z-coordinate, like
322 // geom->XYZ2Detector(x,y,z-ipz,d,r,s,t);
323 AliFMDDetector* det = 0;
325 for (int i = 1; i <= 3; i++) {
326 det = GetDetector(i);
328 if (det->XYZ2Detector(x, y, z, ring, sector, strip)) {
329 detector = det->GetId();
337 //____________________________________________________________________
339 AliFMDGeometry::GetGlobal(const AliRecPoint* p,
341 TMatrixF& /* mat */) const
343 // Get the global coordinates cooresponding to the reconstructed
344 // point p. The coordiates is returned in the 3-vector pos passed
345 // to this member function. The matrix mat is used for rotations.
349 //____________________________________________________________________
351 AliFMDGeometry::GetGlobal(const AliRecPoint* p, TVector3& pos) const
353 // Get the global coordinates cooresponding to the reconstructed
354 // point p. The coordiates is returned in the 3-vector pos passed
355 // to this member function. Note, as AliRecPoint only has places for
356 // 3 indicies, it is assumed that the ring hit is an inner ring -
357 // which obviously needn't be the case. This makes the member
358 // function pretty darn useless.
359 // FIXME: Implement this function to work with outer rings too.
362 p->GetLocalPosition(local);
363 UShort_t detector = UShort_t(local.X());
364 UShort_t sector = UShort_t(local.Y());
365 UShort_t strip = UShort_t(local.Z());
366 Detector2XYZ(detector, 'I', sector, strip, x, y, z);
370 //____________________________________________________________________
372 AliFMDGeometry::Impact(const TParticle* /* particle */) const
374 // Return true, if the particle will hit the active detector
375 // elements, and false if not. Should be used for fast
376 // simulations. Note, that the function currently return false
378 // FIXME: Implement this function.
382 //____________________________________________________________________
384 AliFMDGeometry::ExtractGeomInfo()
386 // Check the volume depth of some nodes, get the active volume
387 // numbers, and so forth.
389 // TODO: Here, we should actually also get the parameters of the
390 // shapes, like the verticies of the polygon shape that makes up the
391 // silicon sensor, the strip pitch, the ring radii, the z-positions,
392 // and so on - that is, all the geometric information we need for
393 // futher processing, such as simulation, digitization,
394 // reconstruction, etc.
395 Int_t detectorDepth = FindNodeDepth("FMD1_1", "ALIC");
396 Int_t ringDepth = FindNodeDepth(Form("FMDI_%d", Int_t('I')), "ALIC");
397 Int_t moduleDepth = FindNodeDepth("FIFV_0", "ALIC");
398 Int_t sectorDepth = FindNodeDepth("FISE_1", "ALIC");
400 AliDebug(1, Form("Geometry depths:\n"
405 sectorDepth, moduleDepth, ringDepth, detectorDepth));
406 if (sectorDepth < 0 && moduleDepth < 0) {
411 fDetectorOff = (ringDepth - detectorDepth);
412 TGeoVolume* actiVol = gGeoManager->GetVolume("FIAC");
413 TGeoVolume* actoVol = gGeoManager->GetVolume("FOAC");
414 if (actiVol) AddActive(actiVol->GetNumber());
415 if (actiVol) AddActive(actoVol->GetNumber());
417 else if (sectorDepth < 0) {
421 fRingOff = (moduleDepth - ringDepth) + 1;
422 fDetectorOff = (moduleDepth - detectorDepth) + 1;
423 TGeoVolume* modiVol = gGeoManager->GetVolume("FIMO");
424 TGeoVolume* modoVol = gGeoManager->GetVolume("FOMO");
425 if (modiVol) AddActive(modiVol->GetNumber());
426 if (modoVol) AddActive(modoVol->GetNumber());
429 Int_t stripDepth = FindNodeDepth("FIST_1", "ALIC");
431 fSectorOff = (stripDepth - sectorDepth);
432 fModuleOff = (moduleDepth >= 0 ? (stripDepth - moduleDepth) : -1);
433 fRingOff = (stripDepth - ringDepth);
434 fDetectorOff = (stripDepth - detectorDepth );
435 TGeoVolume* striVol = gGeoManager->GetVolume("FIST");
436 TGeoVolume* stroVol = gGeoManager->GetVolume("FOST");
437 if (striVol) AddActive(striVol->GetNumber());
438 if (stroVol) AddActive(stroVol->GetNumber());
440 AliDebug(1, Form("Geometry offsets:\n"
445 fSectorOff, fModuleOff, fRingOff, fDetectorOff));
449 //____________________________________________________________________
451 CheckNodes(TGeoNode* node, const char* name, Int_t& lvl)
453 // If there's no node here.
454 if (!node) return -1;
455 // Check if it this one
457 if (sname == node->GetName()) return lvl;
459 // Check if the node is an immediate daugther
460 TObjArray* nodes = node->GetNodes();
461 if (!nodes) return -1;
462 // Increase the level, and search immediate sub nodes.
464 TGeoNode* found = static_cast<TGeoNode*>(nodes->FindObject(name));
465 if (found) return lvl;
467 // Check the sub node, if any of their sub-nodes match.
468 for (Int_t i = 0; i < nodes->GetEntries(); i++) {
469 TGeoNode* sub = static_cast<TGeoNode*>(nodes->At(i));
472 if (CheckNodes(sub, name, lvl) >= 0) return lvl;
474 // If not found, decrease the level
478 //____________________________________________________________________
480 FindNodeDepth(const char* name, const char* volname)
482 // Find the depth of a node
483 TGeoVolume* vol = gGeoManager->GetVolume(volname);
485 std::cerr << "No top volume defined" << std::endl;
488 TObjArray* nodes = vol->GetNodes();
490 std::cerr << "No nodes in top volume" << std::endl;
496 while ((node = static_cast<TGeoNode*>(next())))
497 if (CheckNodes(node, name, lvl) >= 0) return lvl;
501 //____________________________________________________________________