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25 //
26 // G4EllipticalTube implementation
27 //
28 // Author: David C. Williams (davidw@scipp.ucsc.edu)
29 // Revision: Evgueni Tcherniaev (evgueni.tcherniaev@cern.ch), 23.12.2019
30 // --------------------------------------------------------------------
31
32 #include "G4EllipticalTube.hh"
33
34 #if !(defined(G4GEOM_USE_UELLIPTICALTUBE) && defined(G4GEOM_USE_SYS_USOLIDS))
35
36 #include "G4GeomTools.hh"
37 #include "G4RandomTools.hh"
38 #include "G4ClippablePolygon.hh"
39 #include "G4AffineTransform.hh"
40 #include "G4VoxelLimits.hh"
41 #include "G4BoundingEnvelope.hh"
42
43 #include "Randomize.hh"
44
45 #include "G4VGraphicsScene.hh"
46 #include "G4VisExtent.hh"
47
48 #include "G4AutoLock.hh"
49
50 namespace
51 {
52 G4Mutex polyhedronMutex = G4MUTEX_INITIALIZER;
53 }
54
55 using namespace CLHEP;
56
57 //////////////////////////////////////////////////////////////////////////
58 //
59 // Constructor
60
61 G4EllipticalTube::G4EllipticalTube( const G4String &name,
62 G4double Dx,
63 G4double Dy,
64 G4double Dz )
65 : G4VSolid(name), fDx(Dx), fDy(Dy), fDz(Dz)
66 {
67 CheckParameters();
68 }
69
70 //////////////////////////////////////////////////////////////////////////
71 //
72 // Fake default constructor - sets only member data and allocates memory
73 // for usage restricted to object persistency.
74
75 G4EllipticalTube::G4EllipticalTube( __void__& a )
76 : G4VSolid(a), halfTolerance(0.), fDx(0.), fDy(0.), fDz(0.),
77 fRsph(0.), fDDx(0.), fDDy(0.), fSx(0.), fSy(0.), fR(0.),
78 fQ1(0.), fQ2(0.), fScratch(0.)
79 {
80 }
81
82 //////////////////////////////////////////////////////////////////////////
83 //
84 // Destructor
85
86 G4EllipticalTube::~G4EllipticalTube()
87 {
88 delete fpPolyhedron; fpPolyhedron = nullptr;
89 }
90
91 //////////////////////////////////////////////////////////////////////////
92 //
93 // Copy constructor
94
95 G4EllipticalTube::G4EllipticalTube(const G4EllipticalTube& rhs)
96 : G4VSolid(rhs), halfTolerance(rhs.halfTolerance),
97 fDx(rhs.fDx), fDy(rhs.fDy), fDz(rhs.fDz),
98 fCubicVolume(rhs.fCubicVolume), fSurfaceArea(rhs.fSurfaceArea),
99 fRsph(rhs.fRsph), fDDx(rhs.fDDx), fDDy(rhs.fDDy),
100 fSx(rhs.fSx), fSy(rhs.fSy), fR(rhs.fR),
101 fQ1(rhs.fQ1), fQ2(rhs.fQ2), fScratch(rhs.fScratch)
102 {
103 }
104
105 //////////////////////////////////////////////////////////////////////////
106 //
107 // Assignment operator
108
109 G4EllipticalTube& G4EllipticalTube::operator = (const G4EllipticalTube& rhs)
110 {
111 // Check assignment to self
112 //
113 if (this == &rhs) { return *this; }
114
115 // Copy base class data
116 //
117 G4VSolid::operator=(rhs);
118
119 // Copy data
120 //
121 halfTolerance = rhs.halfTolerance;
122 fDx = rhs.fDx;
123 fDy = rhs.fDy;
124 fDz = rhs.fDz;
125 fCubicVolume = rhs.fCubicVolume;
126 fSurfaceArea = rhs.fSurfaceArea;
127
128 fRsph = rhs.fRsph;
129 fDDx = rhs.fDDx;
130 fDDy = rhs.fDDy;
131 fSx = rhs.fSx;
132 fSy = rhs.fSy;
133 fR = rhs.fR;
134 fQ1 = rhs.fQ1;
135 fQ2 = rhs.fQ2;
136 fScratch = rhs.fScratch;
137
138 fRebuildPolyhedron = false;
139 delete fpPolyhedron; fpPolyhedron = nullptr;
140
141 return *this;
142 }
143
144 //////////////////////////////////////////////////////////////////////////
145 //
146 // Check dimensions
147
148 void G4EllipticalTube::CheckParameters()
149 {
150 // Check dimensions
151 //
152 halfTolerance = 0.5*kCarTolerance; // half tolerance
153 G4double dmin = 2*kCarTolerance;
154 if (fDx < dmin || fDy < dmin || fDz < dmin)
155 {
156 std::ostringstream message;
157 message << "Invalid (too small or negative) dimensions for Solid: "
158 << GetName()
159 << "\n Dx = " << fDx
160 << "\n Dy = " << fDy
161 << "\n Dz = " << fDz;
162 G4Exception("G4EllipticalTube::CheckParameters()", "GeomSolids0002",
163 FatalException, message);
164 }
165
166 // Set pre-calculatated values
167 //
168 halfTolerance = 0.5*kCarTolerance; // half tolerance
169 fRsph = std::sqrt(fDx * fDx + fDy * fDy + fDz * fDz); // radius of surrounding sphere
170 fDDx = fDx * fDx; // X semi-axis squared
171 fDDy = fDy * fDy; // Y semi-axis squared
172
173 fR = std::min(fDx, fDy); // resulting radius, after scaling elipse to circle
174 fSx = fR / fDx; // X scale factor
175 fSy = fR / fDy; // Y scale factor
176
177 fQ1 = 0.5 / fR; // distance approxiamtion dist = Q1 * (x^2 + y^2) - Q2
178 fQ2 = 0.5 * (fR + halfTolerance * halfTolerance / fR);
179 fScratch = 2. * fR * fR * DBL_EPSILON; // scratch within calculation error thickness
180 // fScratch = (B * B / A) * (2. + halfTolerance / A) * halfTolerance; // alternative
181 }
182
183 //////////////////////////////////////////////////////////////////////////
184 //
185 // Get bounding box
186
187 void G4EllipticalTube::BoundingLimits( G4ThreeVector& pMin,
188 G4ThreeVector& pMax ) const
189 {
190 pMin.set(-fDx,-fDy,-fDz);
191 pMax.set( fDx, fDy, fDz);
192 }
193
194 //////////////////////////////////////////////////////////////////////////
195 //
196 // Calculate extent under transform and specified limit
197
198 G4bool
199 G4EllipticalTube::CalculateExtent( const EAxis pAxis,
200 const G4VoxelLimits& pVoxelLimit,
201 const G4AffineTransform& pTransform,
202 G4double& pMin, G4double& pMax ) const
203 {
204 G4ThreeVector bmin, bmax;
205 G4bool exist;
206
207 // Check bounding box (bbox)
208 //
209 BoundingLimits(bmin,bmax);
210 G4BoundingEnvelope bbox(bmin,bmax);
211 #ifdef G4BBOX_EXTENT
212 return bbox.CalculateExtent(pAxis,pVoxelLimit, pTransform, pMin, pMax);
213 #endif
214 if (bbox.BoundingBoxVsVoxelLimits(pAxis, pVoxelLimit, pTransform, pMin, pMax))
215 {
216 return exist = pMin < pMax;
217 }
218
219 G4double dx = fDx;
220 G4double dy = fDy;
221 G4double dz = fDz;
222
223 // Set bounding envelope (benv) and calculate extent
224 //
225 const G4int NSTEPS = 24; // number of steps for whole circle
226 G4double ang = twopi/NSTEPS;
227
228 G4double sinHalf = std::sin(0.5*ang);
229 G4double cosHalf = std::cos(0.5*ang);
230 G4double sinStep = 2.*sinHalf*cosHalf;
231 G4double cosStep = 1. - 2.*sinHalf*sinHalf;
232 G4double sx = dx/cosHalf;
233 G4double sy = dy/cosHalf;
234
235 G4double sinCur = sinHalf;
236 G4double cosCur = cosHalf;
237 G4ThreeVectorList baseA(NSTEPS),baseB(NSTEPS);
238 for (G4int k=0; k<NSTEPS; ++k)
239 {
240 baseA[k].set(sx*cosCur,sy*sinCur,-dz);
241 baseB[k].set(sx*cosCur,sy*sinCur, dz);
242
243 G4double sinTmp = sinCur;
244 sinCur = sinCur*cosStep + cosCur*sinStep;
245 cosCur = cosCur*cosStep - sinTmp*sinStep;
246 }
247
248 std::vector<const G4ThreeVectorList *> polygons(2);
249 polygons[0] = &baseA;
250 polygons[1] = &baseB;
251 G4BoundingEnvelope benv(bmin, bmax, polygons);
252 exist = benv.CalculateExtent(pAxis, pVoxelLimit, pTransform, pMin, pMax);
253 return exist;
254 }
255
256 //////////////////////////////////////////////////////////////////////////
257 //
258 // Determine where is point: inside, outside or on surface
259 //
260
261 EInside G4EllipticalTube::Inside( const G4ThreeVector& p ) const
262 {
263 G4double x = p.x() * fSx;
264 G4double y = p.y() * fSy;
265 G4double distR = fQ1 * (x * x + y * y) - fQ2;
266 G4double distZ = std::abs(p.z()) - fDz;
267 G4double dist = std::max(distR, distZ);
268
269 if (dist > halfTolerance) return kOutside;
270 return (dist > -halfTolerance) ? kSurface : kInside;
271 }
272
273 //////////////////////////////////////////////////////////////////////////
274 //
275 // Return unit normal at surface closest to p
276
277 G4ThreeVector G4EllipticalTube::SurfaceNormal( const G4ThreeVector& p ) const
278 {
279 G4ThreeVector norm(0, 0, 0);
280 G4int nsurf = 0;
281
282 // check lateral surface
283 G4double x = p.x() * fSx;
284 G4double y = p.y() * fSy;
285 G4double distR = fQ1 * (x * x + y * y) - fQ2;
286 if (std::abs(distR) <= halfTolerance)
287 {
288 norm = G4ThreeVector(p.x() * fDDy, p.y() * fDDx, 0.).unit();
289 ++nsurf;
290 }
291
292 // check lateral bases
293 G4double distZ = std::abs(p.z()) - fDz;
294 if (std::abs(distZ) <= halfTolerance)
295 {
296 norm.setZ(p.z() < 0 ? -1. : 1.);
297 ++nsurf;
298 }
299
300 // return normal
301 if (nsurf == 1) return norm;
302 else if (nsurf > 1) return norm.unit(); // edge
303 else
304 {
305 // Point is not on the surface
306 //
307 #ifdef G4SPECDEBUG
308 std::ostringstream message;
309 G4long oldprc = message.precision(16);
310 message << "Point p is not on surface (!?) of solid: "
311 << GetName() << G4endl;
312 message << "Position:\n";
313 message << " p.x() = " << p.x()/mm << " mm\n";
314 message << " p.y() = " << p.y()/mm << " mm\n";
315 message << " p.z() = " << p.z()/mm << " mm";
316 G4cout.precision(oldprc);
317 G4Exception("G4EllipticalTube::SurfaceNormal(p)", "GeomSolids1002",
318 JustWarning, message );
319 DumpInfo();
320 #endif
321 return ApproxSurfaceNormal(p);
322 }
323 }
324
325 //////////////////////////////////////////////////////////////////////////
326 //
327 // Find surface nearest to point and return corresponding normal.
328 // The algorithm is similar to the algorithm used in Inside().
329 // This method normally should not be called.
330
331 G4ThreeVector
332 G4EllipticalTube::ApproxSurfaceNormal( const G4ThreeVector& p ) const
333 {
334 G4double x = p.x() * fSx;
335 G4double y = p.y() * fSy;
336 G4double distR = fQ1 * (x * x + y * y) - fQ2;
337 G4double distZ = std::abs(p.z()) - fDz;
338 if (distR > distZ && (x * x + y * y) > 0)
339 return G4ThreeVector(p.x() * fDDy, p.y() * fDDx, 0.).unit();
340 else
341 return {0, 0, (p.z() < 0 ? -1. : 1.)};
342 }
343
344 //////////////////////////////////////////////////////////////////////////
345 //
346 // Calculate distance to shape from outside, along normalised vector,
347 // return kInfinity if no intersection, or distance < halfTolerance
348
349 G4double G4EllipticalTube::DistanceToIn( const G4ThreeVector& p,
350 const G4ThreeVector& v ) const
351 {
352 G4double offset = 0.;
353 G4ThreeVector pcur = p;
354
355 // Check if point is flying away
356 //
357 G4double safex = std::abs(pcur.x()) - fDx;
358 G4double safey = std::abs(pcur.y()) - fDy;
359 G4double safez = std::abs(pcur.z()) - fDz;
360
361 if (safez >= -halfTolerance && pcur.z() * v.z() >= 0.) return kInfinity;
362 if (safey >= -halfTolerance && pcur.y() * v.y() >= 0.) return kInfinity;
363 if (safex >= -halfTolerance && pcur.x() * v.x() >= 0.) return kInfinity;
364
365 // Relocate point, if required
366 //
367 G4double Dmax = 32. * fRsph;
368 if (std::max(std::max(safex, safey), safez) > Dmax)
369 {
370 offset = (1. - 1.e-08) * pcur.mag() - 2. * fRsph;
371 pcur += offset * v;
372 G4double dist = DistanceToIn(pcur, v);
373 return (dist == kInfinity) ? kInfinity : dist + offset;
374 }
375
376 // Scale elliptical tube to cylinder
377 //
378 G4double px = pcur.x() * fSx;
379 G4double py = pcur.y() * fSy;
380 G4double pz = pcur.z();
381 G4double vx = v.x() * fSx;
382 G4double vy = v.y() * fSy;
383 G4double vz = v.z();
384
385 // Set coefficients of quadratic equation: A t^2 + 2B t + C = 0
386 //
387 G4double rr = px * px + py * py;
388 G4double A = vx * vx + vy * vy;
389 G4double B = px * vx + py * vy;
390 G4double C = rr - fR * fR;
391 G4double D = B * B - A * C;
392
393 // Check if point is flying away relative to lateral surface
394 //
395 G4double distR = fQ1 * rr - fQ2;
396 G4bool parallelToZ = (A < DBL_EPSILON || std::abs(vz) >= 1.);
397 if (distR >= -halfTolerance && (B >= 0. || parallelToZ)) return kInfinity;
398
399 // Find intersection with Z planes
400 //
401 G4double invz = (vz == 0) ? DBL_MAX : -1./vz;
402 G4double dz = std::copysign(fDz, invz);
403 G4double tzmin = (pz - dz) * invz;
404 G4double tzmax = (pz + dz) * invz;
405
406 // Solve qudratic equation. There are two cases special where D <= 0:
407 // 1) trajectory parallel to Z axis (A = 0, B = 0, C - any, D = 0)
408 // 2) touch (D = 0) or no intersection (D < 0) with lateral surface
409 //
410 if (parallelToZ) return (tzmin<halfTolerance) ? offset : tzmin + offset; // 1)
411 if (D <= A * A * fScratch) return kInfinity; // 2)
412
413 // Find roots of quadratic equation
414 G4double tmp = -B - std::copysign(std::sqrt(D), B);
415 G4double t1 = tmp / A;
416 G4double t2 = C / tmp;
417 G4double trmin = std::min(t1, t2);
418 G4double trmax = std::max(t1, t2);
419
420 // Return distance
421 G4double tin = std::max(tzmin, trmin);
422 G4double tout = std::min(tzmax, trmax);
423
424 if (tout <= tin + halfTolerance) return kInfinity; // touch or no hit
425 return (tin<halfTolerance) ? offset : tin + offset;
426 }
427
428 //////////////////////////////////////////////////////////////////////////
429 //
430 // Estimate distance to the surface from outside,
431 // returns 0 if point is inside
432
433 G4double G4EllipticalTube::DistanceToIn( const G4ThreeVector& p ) const
434 {
435 // safety distance to bounding box
436 G4double distX = std::abs(p.x()) - fDx;
437 G4double distY = std::abs(p.y()) - fDy;
438 G4double distZ = std::abs(p.z()) - fDz;
439 G4double distB = std::max(std::max(distX, distY), distZ);
440 // return (distB < 0) ? 0 : distB;
441
442 // safety distance to lateral surface
443 G4double x = p.x() * fSx;
444 G4double y = p.y() * fSy;
445 G4double distR = std::sqrt(x * x + y * y) - fR;
446
447 // return SafetyToIn
448 G4double dist = std::max(distB, distR);
449 return (dist < 0) ? 0 : dist;
450 }
451
452 //////////////////////////////////////////////////////////////////////////
453 //
454 // Calculate distance to shape from inside and find normal
455 // at exit point, if required
456 // - when leaving the surface, return 0
457
458 G4double G4EllipticalTube::DistanceToOut( const G4ThreeVector& p,
459 const G4ThreeVector& v,
460 const G4bool calcNorm,
461 G4bool* validNorm,
462 G4ThreeVector* n ) const
463 {
464 // Check if point flying away relative to Z planes
465 //
466 G4double pz = p.z();
467 G4double vz = v.z();
468 G4double distZ = std::abs(pz) - fDz;
469 if (distZ >= -halfTolerance && pz * vz > 0)
470 {
471 if (calcNorm)
472 {
473 *validNorm = true;
474 n->set(0, 0, (pz < 0) ? -1. : 1.);
475 }
476 return 0.;
477 }
478 G4double tzmax = (vz == 0) ? DBL_MAX : (std::copysign(fDz, vz) - pz) / vz;
479
480 // Scale elliptical tube to cylinder
481 //
482 G4double px = p.x() * fSx;
483 G4double py = p.y() * fSy;
484 G4double vx = v.x() * fSx;
485 G4double vy = v.y() * fSy;
486
487 // Check if point is flying away relative to lateral surface
488 //
489 G4double rr = px * px + py * py;
490 G4double B = px * vx + py * vy;
491 G4double distR = fQ1 * rr - fQ2;
492 if (distR >= -halfTolerance && B > 0.)
493 {
494 if (calcNorm)
495 {
496 *validNorm = true;
497 *n = G4ThreeVector(px * fDDy, py * fDDx, 0.).unit();
498 }
499 return 0.;
500 }
501
502 // Just in case check if point is outside, normally it should never be
503 //
504 if (std::max(distZ, distR) > halfTolerance)
505 {
506 #ifdef G4SPECDEBUG
507 std::ostringstream message;
508 G4long oldprc = message.precision(16);
509 message << "Point p is outside (!?) of solid: "
510 << GetName() << G4endl;
511 message << "Position: " << p << G4endl;;
512 message << "Direction: " << v;
513 G4cout.precision(oldprc);
514 G4Exception("G4EllipticalTube::DistanceToOut(p,v)", "GeomSolids1002",
515 JustWarning, message );
516 DumpInfo();
517 #endif
518 if (calcNorm)
519 {
520 *validNorm = true;
521 *n = ApproxSurfaceNormal(p);
522 }
523 return 0.;
524 }
525
526 // Set coefficients of quadratic equation: A t^2 + 2B t + C = 0
527 //
528 G4double A = vx * vx + vy * vy;
529 G4double C = rr - fR * fR;
530 G4double D = B * B - A * C;
531
532 // Solve qudratic equation. There are two special cases where D <= 0:
533 // 1) trajectory parallel to Z axis (A = 0, B = 0, C - any, D = 0)
534 // 2) touch (D = 0) or no intersection (D < 0) with lateral surface
535 //
536 G4bool parallelToZ = (A < DBL_EPSILON || std::abs(vz) >= 1.);
537 if (parallelToZ) // 1)
538 {
539 if (calcNorm)
540 {
541 *validNorm = true;
542 n->set(0, 0, (vz < 0) ? -1. : 1.);
543 }
544 return tzmax;
545 }
546 if (D <= A * A * fScratch) // 2)
547 {
548 if (calcNorm)
549 {
550 *validNorm = true;
551 *n = G4ThreeVector(px * fDDy, py * fDDx, 0.).unit();
552 }
553 return 0.;
554 }
555
556 // Find roots of quadratic equation
557 G4double tmp = -B - std::copysign(std::sqrt(D), B);
558 G4double t1 = tmp / A;
559 G4double t2 = C / tmp;
560 G4double trmax = std::max(t1, t2);
561
562 // Return distance
563 G4double tmax = std::min(tzmax, trmax);
564
565 // Set normal, if required, and return distance
566 //
567 if (calcNorm)
568 {
569 *validNorm = true;
570 G4ThreeVector pnew = p + tmax * v;
571 if (tmax == tzmax)
572 n->set(0, 0, (pnew.z() < 0) ? -1. : 1.);
573 else
574 *n = G4ThreeVector(pnew.x() * fDDy, pnew.y() * fDDx, 0.).unit();
575 }
576 return tmax;
577 }
578
579 //////////////////////////////////////////////////////////////////////////
580 //
581 // Estimate distance to the surface from inside,
582 // returns 0 if point is outside
583 //
584
585 G4double G4EllipticalTube::DistanceToOut( const G4ThreeVector& p ) const
586 {
587 #ifdef G4SPECDEBUG
588 if( Inside(p) == kOutside )
589 {
590 std::ostringstream message;
591 G4long oldprc = message.precision(16);
592 message << "Point p is outside (!?) of solid: " << GetName() << "\n"
593 << "Position:\n"
594 << " p.x() = " << p.x()/mm << " mm\n"
595 << " p.y() = " << p.y()/mm << " mm\n"
596 << " p.z() = " << p.z()/mm << " mm";
597 message.precision(oldprc) ;
598 G4Exception("G4ElliptocalTube::DistanceToOut(p)", "GeomSolids1002",
599 JustWarning, message);
600 DumpInfo();
601 }
602 #endif
603 // safety distance to Z-bases
604 G4double distZ = fDz - std::abs(p.z());
605
606 // safety distance lateral surface
607 G4double x = p.x() * fSx;
608 G4double y = p.y() * fSy;
609 G4double distR = fR - std::sqrt(x * x + y * y);
610
611 // return SafetyToOut
612 G4double dist = std::min(distZ, distR);
613 return (dist < 0) ? 0 : dist;
614 }
615
616 //////////////////////////////////////////////////////////////////////////
617 //
618 // GetEntityType
619
620 G4GeometryType G4EllipticalTube::GetEntityType() const
621 {
622 return {"G4EllipticalTube"};
623 }
624
625 //////////////////////////////////////////////////////////////////////////
626 //
627 // Make a clone of the object
628
629 G4VSolid* G4EllipticalTube::Clone() const
630 {
631 return new G4EllipticalTube(*this);
632 }
633
634 //////////////////////////////////////////////////////////////////////////
635 //
636 // Return volume
637
638 G4double G4EllipticalTube::GetCubicVolume()
639 {
640 if (fCubicVolume == 0.)
641 {
642 fCubicVolume = twopi * fDx * fDy * fDz;
643 }
644 return fCubicVolume;
645 }
646
647 //////////////////////////////////////////////////////////////////////////
648 //
649 // Return cached surface area
650
651 G4double G4EllipticalTube::GetCachedSurfaceArea() const
652 {
653 G4ThreadLocalStatic G4double cached_Dx = 0;
654 G4ThreadLocalStatic G4double cached_Dy = 0;
655 G4ThreadLocalStatic G4double cached_Dz = 0;
656 G4ThreadLocalStatic G4double cached_area = 0;
657 if (cached_Dx != fDx || cached_Dy != fDy || cached_Dz != fDz)
658 {
659 cached_Dx = fDx;
660 cached_Dy = fDy;
661 cached_Dz = fDz;
662 cached_area = 2.*(pi*fDx*fDy + G4GeomTools::EllipsePerimeter(fDx, fDy)*fDz);
663 }
664 return cached_area;
665 }
666
667 //////////////////////////////////////////////////////////////////////////
668 //
669 // Return surface area
670
671 G4double G4EllipticalTube::GetSurfaceArea()
672 {
673 if(fSurfaceArea == 0.)
674 {
675 fSurfaceArea = GetCachedSurfaceArea();
676 }
677 return fSurfaceArea;
678 }
679
680 //////////////////////////////////////////////////////////////////////////
681 //
682 // Stream object contents to output stream
683
684 std::ostream& G4EllipticalTube::StreamInfo(std::ostream& os) const
685 {
686 G4long oldprc = os.precision(16);
687 os << "-----------------------------------------------------------\n"
688 << " *** Dump for solid - " << GetName() << " ***\n"
689 << " ===================================================\n"
690 << " Solid type: G4EllipticalTube\n"
691 << " Parameters: \n"
692 << " length Z: " << fDz/mm << " mm \n"
693 << " lateral surface equation: \n"
694 << " (X / " << fDx << ")^2 + (Y / " << fDy << ")^2 = 1 \n"
695 << "-----------------------------------------------------------\n";
696 os.precision(oldprc);
697
698 return os;
699 }
700
701
702 //////////////////////////////////////////////////////////////////////////
703 //
704 // Pick up a random point on the surface
705
706 G4ThreeVector G4EllipticalTube::GetPointOnSurface() const
707 {
708 // Select surface (0 - base at -Z, 1 - base at +Z, 2 - lateral surface)
709 //
710 G4double sbase = pi * fDx * fDy;
711 G4double ssurf = GetCachedSurfaceArea();
712 G4double select = ssurf * G4UniformRand();
713
714 G4int k = 0;
715 if (select > sbase) k = 1;
716 if (select > 2. * sbase) k = 2;
717
718 // Pick random point on selected surface (rejection sampling)
719 //
720 G4ThreeVector p;
721 switch (k) {
722 case 0: // base at -Z
723 {
724 G4TwoVector rho = G4RandomPointInEllipse(fDx, fDy);
725 p.set(rho.x(), rho.y(), -fDz);
726 break;
727 }
728 case 1: // base at +Z
729 {
730 G4TwoVector rho = G4RandomPointInEllipse(fDx, fDy);
731 p.set(rho.x(), rho.y(), fDz);
732 break;
733 }
734 case 2: // lateral surface
735 {
736 G4TwoVector rho = G4RandomPointOnEllipse(fDx, fDy);
737 p.set(rho.x(), rho.y(), (2. * G4UniformRand() - 1.) * fDz);
738 break;
739 }
740 }
741 return p;
742 }
743
744
745 //////////////////////////////////////////////////////////////////////////
746 //
747 // CreatePolyhedron
748
749 G4Polyhedron* G4EllipticalTube::CreatePolyhedron() const
750 {
751 // create cylinder with radius=1...
752 //
753 G4Polyhedron* eTube = new G4PolyhedronTube(0., 1., fDz);
754
755 // apply non-uniform scaling...
756 //
757 eTube->Transform(G4Scale3D(fDx, fDy, 1.));
758 return eTube;
759 }
760
761 //////////////////////////////////////////////////////////////////////////
762 //
763 // GetPolyhedron
764
765 G4Polyhedron* G4EllipticalTube::GetPolyhedron () const
766 {
767 if (fpPolyhedron == nullptr ||
768 fRebuildPolyhedron ||
769 fpPolyhedron->GetNumberOfRotationStepsAtTimeOfCreation() !=
770 fpPolyhedron->GetNumberOfRotationSteps())
771 {
772 G4AutoLock l(&polyhedronMutex);
773 delete fpPolyhedron;
774 fpPolyhedron = CreatePolyhedron();
775 fRebuildPolyhedron = false;
776 l.unlock();
777 }
778 return fpPolyhedron;
779 }
780
781 //////////////////////////////////////////////////////////////////////////
782 //
783 // DescribeYourselfTo
784
785 void G4EllipticalTube::DescribeYourselfTo( G4VGraphicsScene& scene ) const
786 {
787 scene.AddSolid (*this);
788 }
789
790 //////////////////////////////////////////////////////////////////////////
791 //
792 // GetExtent
793
794 G4VisExtent G4EllipticalTube::GetExtent() const
795 {
796 return { -fDx, fDx, -fDy, fDy, -fDz, fDz };
797 }
798
799 #endif // !defined(G4GEOM_USE_UELLIPTICALTUBE) || !defined(G4GEOM_USE_SYS_USOLIDS)
800