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25 //
26 // G4ErrorCylSurfaceTarget class implementation
27 //
28 // Created: P.Arce, September 2004
29 // --------------------------------------------------------------------
30
31 #include "G4ErrorCylSurfaceTarget.hh"
32 #include "G4GeometryTolerance.hh"
33
34 #ifdef G4VERBOSE
35 #include "G4ErrorPropagatorData.hh" // for verbosity checking
36 #endif
37
38 #include "geomdefs.hh"
39 #include "G4Normal3D.hh"
40 #include "G4Plane3D.hh"
41
42 //---------------------------------------------------------------------
43
44 G4ErrorCylSurfaceTarget::
45 G4ErrorCylSurfaceTarget( const G4double& radius,
46 const G4ThreeVector& trans,
47 const G4RotationMatrix& rotm )
48 : fradius(radius)
49 {
50 theType = G4ErrorTarget_CylindricalSurface;
51
52 ftransform = G4AffineTransform( rotm.inverse(), -trans );
53 #ifdef G4VERBOSE
54 if(G4ErrorPropagatorData::verbose() >= 2 )
55 {
56 Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
57 }
58 #endif
59 }
60
61 //---------------------------------------------------------------------
62
63 G4ErrorCylSurfaceTarget::
64 G4ErrorCylSurfaceTarget( const G4double& radius,
65 const G4AffineTransform& trans )
66 : fradius(radius), ftransform(trans.Inverse())
67 {
68 theType = G4ErrorTarget_CylindricalSurface;
69
70 #ifdef G4VERBOSE
71 if(G4ErrorPropagatorData::verbose() >= 2 )
72 {
73 Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
74 }
75 #endif
76 }
77
78 //---------------------------------------------------------------------
79
80 G4double G4ErrorCylSurfaceTarget::
81 GetDistanceFromPoint( const G4ThreeVector& point,
82 const G4ThreeVector& dir ) const
83 {
84 if( dir.mag() == 0. )
85 {
86 G4Exception("G4ErrorCylSurfaceTarget::GetDistanceFromPoint()",
87 "GeomMgt0003", FatalException, "Direction is zero !");
88 }
89
90 //----- Get intersection point
91 G4ThreeVector localPoint = ftransform.TransformPoint( point );
92 G4ThreeVector localDir = ftransform.TransformAxis( dir );
93 G4ThreeVector inters = IntersectLocal(localPoint, localDir);
94
95 G4double dist = (localPoint-inters).mag();
96
97 #ifdef G4VERBOSE
98 if(G4ErrorPropagatorData::verbose() >= 3 )
99 {
100 G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint():" << G4endl
101 << " Global point " << point << " dir " << dir << G4endl
102 << " Intersection " << inters << G4endl
103 << " Distance " << dist << G4endl;
104 Dump( " CylSurface: " );
105 }
106 #endif
107
108 return dist;
109 }
110
111
112 //---------------------------------------------------------------------
113
114 G4double G4ErrorCylSurfaceTarget::
115 GetDistanceFromPoint( const G4ThreeVector& point ) const
116 {
117 G4ThreeVector localPoint = ftransform.TransformPoint( point );
118
119 #ifdef G4VERBOSE
120 if(G4ErrorPropagatorData::verbose() >= 3 )
121 {
122 G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint:" << G4endl
123 << " Global point " << point << G4endl
124 << " Distance " << fradius - localPoint.perp() << G4endl;
125 Dump( " CylSurface: " );
126 }
127 #endif
128
129 return fradius - localPoint.perp();
130 }
131
132 //---------------------------------------------------------------------
133
134 G4ThreeVector G4ErrorCylSurfaceTarget::
135 IntersectLocal( const G4ThreeVector& localPoint,
136 const G4ThreeVector& localDir ) const
137 {
138 G4double eqa = localDir.x()*localDir.x()+localDir.y()*localDir.y();
139 G4double eqb = 2*(localPoint.x()*localDir.x()+localPoint.y()*localDir.y());
140 G4double eqc = -fradius*fradius+localPoint.x()*localPoint.x()
141 +localPoint.y()*localPoint.y();
142 G4int inside = (localPoint.perp() > fradius) ? -1 : 1;
143 G4double lambda;
144
145 if( eqa*inside > 0. )
146 {
147 lambda = (-eqb + std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
148 }
149 else if( eqa*inside < 0. )
150 {
151 lambda = (-eqb - std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
152 }
153 else
154 {
155 if( eqb != 0. )
156 {
157 lambda = -eqc/eqb;
158 }
159 else
160 {
161 std::ostringstream message;
162 message << "Intersection not possible !" << G4endl
163 << " Point: " << localPoint << ", direction: "
164 << localDir;
165 Dump( " CylSurface: " );
166 G4Exception("G4ErrorCylSurfaceTarget::IntersectLocal()",
167 "GeomMgt1002", JustWarning, message);
168 lambda = kInfinity;
169 }
170 }
171
172 G4ThreeVector inters = localPoint + lambda*localDir/localDir.mag();
173
174 #ifdef G4VERBOSE
175 if(G4ErrorPropagatorData::verbose() >= 4 ) {
176 G4cout << " G4ErrorCylSurfaceTarget::IntersectLocal " << inters << " "
177 << inters.perp() << " localPoint " << localPoint << " localDir "
178 << localDir << G4endl;
179 }
180 #endif
181
182 return inters;
183 }
184
185 //---------------------------------------------------------------------
186
187 G4Plane3D G4ErrorCylSurfaceTarget::
188 GetTangentPlane( const G4ThreeVector& point ) const
189 {
190 G4ThreeVector localPoint = ftransform.TransformPoint( point );
191
192 // check that point is at cylinder surface
193 //
194 if( std::fabs( localPoint.perp() - fradius )
195 > 1000.*G4GeometryTolerance::GetInstance()->GetSurfaceTolerance() )
196 {
197 std::ostringstream message;
198 message << "Local point not at surface !" << G4endl
199 << " Point: " << point << ", local: " << localPoint
200 << G4endl
201 << " is not at surface, but far away by: "
202 << localPoint.perp() - fradius << " !";
203 G4Exception("G4ErrorCylSurfaceTarget::GetTangentPlane()",
204 "GeomMgt1002", JustWarning, message);
205 }
206
207 G4Normal3D normal = localPoint - ftransform.NetTranslation();
208
209 return G4Plane3D( normal, point );
210 }
211
212
213 //---------------------------------------------------------------------
214
215 void G4ErrorCylSurfaceTarget::Dump( const G4String& msg ) const
216 {
217 G4cout << msg << " radius " << fradius
218 << " centre " << ftransform.NetTranslation()
219 << " rotation " << ftransform.NetRotation() << G4endl;
220 }
221