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21dd83fc | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * SigmaEffect_thetadegrees * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpeateose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | // $Id$ | |
17 | // | |
18 | // Class AliMUONGeometryMisAligner | |
19 | // ---------------------------- | |
20 | // Class for misalignment of geometry transformations | |
21 | // | |
22 | // Author:Bruce Becker | |
23 | ||
24 | //__________________________________________________________________ | |
25 | // | |
26 | ///////////////////////////////////////////////////////////////////// | |
27 | //This performs the misalignment on an existing muon arm geometry | |
28 | // based on the standard definition of the detector elements in | |
29 | // $ALICE_ROOT/MUON/data | |
30 | // | |
31 | // --> User has to specify the magnitude of the alignments, in the Cartesian | |
32 | // co-ordiantes (which are used to apply translation misalignments) and in the | |
33 | // spherical co-ordinates (which are used to apply angular displacements) | |
34 | // --> If the constructor is used with no arguments, user has to set | |
35 | // misalignment ranges by hand using the methods : | |
36 | // SetApplyMisAlig, SetMaxCartMisAlig, SetMaxAngMisAlig, SetXYAngMisAligFactor | |
37 | // (last method takes account of the fact that the misalingment is greatest in | |
38 | // the XY plane, since the detection elements are fixed to a support structure | |
39 | // in this plane. Misalignments in the XZ and YZ plane will be very small | |
40 | // compared to those in the XY plane, which are small already - of the order | |
41 | // of microns) | |
42 | ||
43 | // Note : If the detection elements are allowed to be misaligned in all | |
44 | // directions, this has consequences for the alignment algorithm | |
45 | // (AliMUONAlignment), which needs to know the number of free parameters. | |
46 | // Eric only allowed 3 : x,y,theta_xy, but in principle z and the other | |
47 | // two angles are alignable as well. | |
48 | ||
49 | ||
50 | ||
51 | #include "AliMUONGeometryMisAligner.h" | |
52 | #include "AliMUONGeometryTransformer.h" | |
53 | #include "AliMUONGeometryModuleTransformer.h" | |
54 | #include "AliMUONGeometryDetElement.h" | |
55 | #include "AliMUONGeometryStore.h" | |
56 | #include "AliMUONGeometryBuilder.h" | |
57 | #include <TGeoManager.h> | |
58 | #include <Riostream.h> | |
59 | #include <TObjArray.h> | |
60 | #include <TSystem.h> | |
61 | #include <TMath.h> | |
62 | #include <TRandom.h> | |
63 | ||
64 | #include "AliLog.h" | |
65 | ||
66 | #include <sstream> | |
67 | ||
68 | ClassImp(AliMUONGeometryMisAligner) | |
69 | //______________________________________________________________________________ | |
70 | AliMUONGeometryMisAligner::AliMUONGeometryMisAligner(Double_t cartMisAlig, Double_t angMisAlig) | |
71 | :TObject(), fDisplacementGenerator(0) | |
72 | { | |
73 | /// Standard constructor | |
74 | fMaxCartMisAlig = cartMisAlig; // 0.5 mm. Perhaps this should go into AliMUONConstants.h ? | |
75 | fMaxAngMisAlig = angMisAlig; | |
76 | fXYAngMisAligFactor = 1.0; | |
77 | fDisplacementGenerator = new TRandom(0); | |
78 | } | |
79 | ||
80 | //_____________________________________________________________________________ | |
81 | AliMUONGeometryMisAligner::AliMUONGeometryMisAligner() | |
82 | :TObject(), fDisplacementGenerator(0) | |
83 | { | |
84 | /// Default constructor | |
85 | } | |
86 | ||
87 | //______________________________________________________________________________ | |
88 | AliMUONGeometryMisAligner:: | |
89 | AliMUONGeometryMisAligner(const AliMUONGeometryMisAligner & right): | |
90 | TObject(right) | |
91 | { | |
92 | /// Copy constructor (not implemented) | |
93 | ||
94 | AliFatal("Copy constructor not provided."); | |
95 | } | |
96 | ||
97 | //______________________________________________________________________________ | |
98 | AliMUONGeometryMisAligner::~AliMUONGeometryMisAligner() | |
99 | { | |
100 | /// Destructor | |
101 | ||
102 | delete fDisplacementGenerator; | |
103 | } | |
104 | ||
105 | //______________________________________________________________________________ | |
106 | AliMUONGeometryMisAligner & AliMUONGeometryMisAligner:: | |
107 | operator=(const AliMUONGeometryMisAligner & right) | |
108 | { | |
109 | /// Assignement operator (not implemented) | |
110 | ||
111 | // check assignement to self | |
112 | if (this == &right) | |
113 | return *this; | |
114 | ||
115 | AliFatal("Assignement operator not provided."); | |
116 | ||
117 | return *this; | |
118 | } | |
119 | ||
120 | void | |
121 | AliMUONGeometryMisAligner::SetXYAngMisAligFactor(Double_t factor) | |
122 | { | |
123 | if (TMath::Abs(factor) > 1.0 && factor > 0.) | |
124 | fXYAngMisAligFactor = factor; | |
125 | else | |
126 | AliError(Form("Invalid factor, %d", factor)); | |
127 | } | |
128 | ||
129 | //_________________________________________________________________________ | |
130 | TGeoCombiTrans AliMUONGeometryMisAligner::MisAlign(const TGeoCombiTrans & transform) const | |
131 | { | |
132 | /// Misalign given transformation and return the misaligned transformation | |
133 | ||
134 | Double_t cartMisAlig[3] = {0,0,0}; | |
135 | Double_t angMisAlig[3] = {0,0,0}; | |
136 | const Double_t *trans = transform.GetTranslation(); | |
137 | TGeoRotation *rot; | |
138 | // check if the rotation we obtain is not NULL | |
139 | if (transform.GetRotation()) | |
140 | { | |
141 | rot = transform.GetRotation(); | |
142 | } | |
143 | else | |
144 | { | |
145 | rot = new TGeoRotation("rot"); | |
146 | } // default constructor. | |
147 | ||
148 | cartMisAlig[0] = fDisplacementGenerator->Uniform(-1. * fMaxCartMisAlig, fMaxCartMisAlig); | |
149 | cartMisAlig[1] = fDisplacementGenerator->Uniform(-1. * fMaxCartMisAlig, fMaxCartMisAlig); | |
150 | cartMisAlig[2] = fDisplacementGenerator->Uniform(-1. * fMaxCartMisAlig, fMaxCartMisAlig); | |
151 | ||
152 | TGeoTranslation newTrans(cartMisAlig[0] + trans[0], cartMisAlig[1] + trans[1], cartMisAlig[2] + trans[2]); | |
153 | ||
154 | /* | |
155 | misalign the centre of the local transformation | |
156 | rotation axes : | |
157 | fAngMisAlig[1,2,3] = [x,y,z] | |
158 | Assume that misalignment about the x and y axes (misalignment of z plane) | |
159 | is much smaller, since the entire detection plane has to be moved (the | |
160 | detection elements are on a support structure), while rotation of the x-y | |
161 | plane is more free. | |
162 | */ | |
163 | ||
164 | angMisAlig[0] = fDisplacementGenerator->Uniform(fXYAngMisAligFactor * fMaxAngMisAlig, 1.0 * fMaxAngMisAlig); | |
165 | angMisAlig[1] = fDisplacementGenerator->Uniform(fXYAngMisAligFactor * fMaxAngMisAlig, 1.0 * fMaxAngMisAlig); | |
166 | angMisAlig[2] = fDisplacementGenerator->Uniform(-1. * fMaxAngMisAlig, fMaxAngMisAlig); // degrees | |
167 | AliInfo(Form("Rotated by %f about Z axis.", angMisAlig[2])); | |
168 | rot->RotateX(angMisAlig[0]); | |
169 | rot->RotateY(angMisAlig[1]); | |
170 | rot->RotateZ(angMisAlig[2]); | |
171 | ||
172 | return TGeoCombiTrans(newTrans, *rot); | |
173 | } | |
174 | ||
175 | ||
176 | //______________________________________________________________________ | |
177 | AliMUONGeometryTransformer * | |
178 | AliMUONGeometryMisAligner::MisAlign(const AliMUONGeometryTransformer * | |
179 | transformer, Bool_t verbose) | |
180 | { | |
181 | ///////////////////////////////////////////////////////////////////// | |
182 | // Takes the internal geometry module transformers, copies them | |
183 | // and gets the Detection Elements from them. | |
184 | // Calculates misalignment parameters and applies these | |
185 | // to the local transform of the Detection Element | |
186 | // Obtains the global transform by multiplying the module transformer | |
187 | // transformation with the local transformation | |
188 | // Applies the global transform to a new detection element | |
189 | // Adds the new detection element to a new module transformer | |
190 | // Adds the new module transformer to a new geometry transformer | |
191 | // Returns the new geometry transformer | |
192 | ||
193 | ||
194 | AliMUONGeometryTransformer *newGeometryTransformer = | |
195 | new AliMUONGeometryTransformer(kTRUE); | |
196 | for (Int_t iMt = 0; iMt < transformer->GetNofModuleTransformers(); iMt++) | |
197 | { // module transformers | |
198 | ||
199 | const AliMUONGeometryModuleTransformer *kModuleTransformer = | |
200 | transformer->GetModuleTransformer(iMt, true); | |
201 | ||
202 | AliMUONGeometryModuleTransformer *newModuleTransformer = | |
203 | new AliMUONGeometryModuleTransformer(iMt); | |
204 | newGeometryTransformer->AddModuleTransformer(newModuleTransformer); | |
205 | ||
206 | const TGeoCombiTrans *kModuleTransform = | |
207 | kModuleTransformer->GetTransformation(); | |
208 | TGeoCombiTrans *newModuleTransform = new TGeoCombiTrans(*kModuleTransform); // same module transform as the previous one | |
209 | newModuleTransformer->SetTransformation(*kModuleTransform); | |
210 | ||
211 | AliMUONGeometryStore *detElements = | |
212 | kModuleTransformer->GetDetElementStore(); | |
213 | ||
214 | if (verbose) | |
215 | AliInfo(Form | |
216 | ("%i DEs in old GeometryStore %i", | |
217 | detElements->GetNofEntries(), iMt)); | |
218 | ||
219 | for (Int_t iDe = 0; iDe < detElements->GetNofEntries(); iDe++) | |
220 | { // detection elements. | |
221 | AliMUONGeometryDetElement *detElement = | |
222 | (AliMUONGeometryDetElement *) detElements->GetEntry(iDe); | |
223 | if (!detElement) | |
224 | AliFatal("Detection element not found."); | |
225 | ||
226 | // local transformation of this detection element. | |
227 | const TGeoCombiTrans *kLocalTransform = | |
228 | detElement->GetLocalTransformation(); | |
229 | TGeoCombiTrans newLocalTransform = MisAlign(*kLocalTransform); | |
230 | ||
231 | /// make a new detection element with this local transform | |
232 | AliMUONGeometryDetElement *newDetElement = | |
233 | new AliMUONGeometryDetElement(detElement->GetId(), | |
234 | detElement->GetAlignedVolume(), | |
235 | newLocalTransform); | |
236 | ||
237 | TGeoHMatrix newGlobalTransform = | |
238 | AliMUONGeometryBuilder::Multiply(newLocalTransform, | |
239 | *newModuleTransform); | |
240 | ||
241 | newDetElement->SetGlobalTransformation(newGlobalTransform); | |
242 | if (verbose) | |
243 | AliInfo("GlobalTransforms:"); | |
244 | newModuleTransformer->GetDetElementStore()->Add( | |
245 | newDetElement->GetId(), | |
246 | newDetElement); | |
247 | } | |
248 | if (verbose) | |
249 | AliInfo(Form("Added module transformer %i to the transformer", iMt)); | |
250 | newGeometryTransformer->AddModuleTransformer(newModuleTransformer); | |
251 | } | |
252 | return newGeometryTransformer; | |
253 | } | |
254 | ||
255 | ||
256 | ||
257 |