TGeoParaboloid.cxx

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// @(#)root/geom:$Id$
// Author: Mihaela Gheata   20/06/04
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
/** \class TGeoParaboloid
\ingroup Shapes_classes
 
A paraboloid is defined by the revolution surface generated by a
parabola and is bounded by two planes perpendicular to Z axis. The
parabola equation is taken in the form: `z = a·r2 + b`, where:
`r2 = x2 + y2`. Note the missing linear term (parabola symmetric with
respect to Z axis).
 
The coefficients a and b are computed from the input values which are
the radii of the circular sections cut by the planes at `+/-dz`:
 
  - `-dz = a*r2low  + b`
  - ` dz = a*r2high + b`
 
~~~{.cpp}
TGeoParaboloid(Double_t rlo,Double_t rhi,Double_t dz);
~~~
 
Begin_Macro
{
   new TGeoManager("parab", "paraboloid");
   TGeoMaterial *mat = new TGeoMaterial("Al", 26.98,13,2.7);
   TGeoMedium *med = new TGeoMedium("MED",1,mat);
   TGeoVolume *top = gGeoManager->MakeBox("TOP",med,100,100,100);
   gGeoManager->SetTopVolume(top);
   TGeoVolume *vol = gGeoManager->MakeParaboloid("PARAB",med,0, 40, 50);
   TGeoParaboloid *par = (TGeoParaboloid*)vol->GetShape();
   top->AddNode(vol,1);
   gGeoManager->CloseGeometry();
   gGeoManager->SetNsegments(80);
   top->Draw();
   TView *view = gPad->GetView();
   view->ShowAxis();
}
End_Macro
*/
 
#include <iostream>
#include "TGeoManager.h"
#include "TGeoVolume.h"
#include "TVirtualGeoPainter.h"
#include "TGeoParaboloid.h"
#include "TBuffer3D.h"
#include "TBuffer3DTypes.h"
#include "TMath.h"
 
ClassImp(TGeoParaboloid);
 
////////////////////////////////////////////////////////////////////////////////
/// Dummy constructor
 
TGeoParaboloid::TGeoParaboloid()
{
   fRlo = 0;
   fRhi = 0;
   fDz  = 0;
   fA   = 0;
   fB   = 0;
   SetShapeBit(TGeoShape::kGeoParaboloid);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor specifying X and Y semiaxis length
 
TGeoParaboloid::TGeoParaboloid(Double_t rlo, Double_t rhi, Double_t dz)
           :TGeoBBox(0,0,0)
{
   fRlo = 0;
   fRhi = 0;
   fDz  = 0;
   fA   = 0;
   fB   = 0;
   SetShapeBit(TGeoShape::kGeoParaboloid);
   SetParaboloidDimensions(rlo, rhi, dz);
   ComputeBBox();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor specifying X and Y semiaxis length
 
TGeoParaboloid::TGeoParaboloid(const char *name, Double_t rlo, Double_t rhi, Double_t dz)
           :TGeoBBox(name, 0, 0, 0)
{
   fRlo = 0;
   fRhi = 0;
   fDz  = 0;
   fA   = 0;
   fB   = 0;
   SetShapeBit(TGeoShape::kGeoParaboloid);
   SetParaboloidDimensions(rlo, rhi, dz);
   ComputeBBox();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor specifying minimum and maximum radius
///  - param[0] =  rlo
///  - param[1] =  rhi
///  - param[2] = dz
 
TGeoParaboloid::TGeoParaboloid(Double_t *param)
{
   SetShapeBit(TGeoShape::kGeoParaboloid);
   SetDimensions(param);
   ComputeBBox();
}
 
////////////////////////////////////////////////////////////////////////////////
/// destructor
 
TGeoParaboloid::~TGeoParaboloid()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Computes capacity of the shape in [length^3]
 
Double_t TGeoParaboloid::Capacity() const
{
   Double_t capacity = TMath::Pi()*fDz*(fRlo*fRlo+fRhi*fRhi);
   return capacity;
}
 
////////////////////////////////////////////////////////////////////////////////
/// compute bounding box of the tube
 
void TGeoParaboloid::ComputeBBox()
{
   fDX = TMath::Max(fRlo, fRhi);
   fDY = fDX;
   fDZ = fDz;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute normal to closest surface from POINT.
 
void TGeoParaboloid::ComputeNormal(const Double_t *point, const Double_t *dir, Double_t *norm)
{
   norm[0] = norm[1] = 0.0;
   if (TMath::Abs(point[2]) > fDz) {
      norm[2] = TMath::Sign(1., dir[2]);
      return;
   }
   Double_t safz = fDz-TMath::Abs(point[2]);
   Double_t r = TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
   Double_t safr = TMath::Abs(r-TMath::Sqrt((point[2]-fB)/fA));
   if (safz<safr) {
      norm[2] = TMath::Sign(1., dir[2]);
      return;
   }
   Double_t talf = -2.*fA*r;
   Double_t calf = 1./TMath::Sqrt(1.+talf*talf);
   Double_t salf = talf * calf;
   Double_t phi = TMath::ATan2(point[1], point[0]);
 
   norm[0] = salf*TMath::Cos(phi);
   norm[1] = salf*TMath::Sin(phi);
   norm[2] = calf;
   Double_t ndotd = norm[0]*dir[0]+norm[1]*dir[1]+norm[2]*dir[2];
   if (ndotd < 0) {
      norm[0] = -norm[0];
      norm[1] = -norm[1];
      norm[2] = -norm[2];
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// test if point is inside the elliptical tube
 
Bool_t TGeoParaboloid::Contains(const Double_t *point) const
{
   if (TMath::Abs(point[2])>fDz) return kFALSE;
   Double_t aa = fA*(point[2]-fB);
   if (aa < 0) return kFALSE;
   Double_t rsq = point[0]*point[0]+point[1]*point[1];
   if (aa < fA*fA*rsq) return kFALSE;
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// compute closest distance from point px,py to each vertex
 
Int_t TGeoParaboloid::DistancetoPrimitive(Int_t px, Int_t py)
{
   Int_t n = gGeoManager->GetNsegments();
   const Int_t numPoints=n*(n+1)+2;
   return ShapeDistancetoPrimitive(numPoints, px, py);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute distance from a point to the parabola given by:
///  `z = a*rsq + b;   rsq = x*x+y*y`
 
Double_t TGeoParaboloid::DistToParaboloid(const Double_t *point, const Double_t *dir, Bool_t in) const
{
   Double_t rsq = point[0]*point[0]+point[1]*point[1];
   Double_t a = fA * (dir[0]*dir[0] + dir[1]*dir[1]);
   Double_t b = 2.*fA*(point[0]*dir[0]+point[1]*dir[1])-dir[2];
   Double_t c = fA*rsq + fB - point[2];
   Double_t dist = TGeoShape::Big();
   if (TMath::Abs(a)<TGeoShape::Tolerance()) {
      if (TMath::Abs(b)<TGeoShape::Tolerance()) return dist; // big
      dist = -c/b;
      if (dist < 0) return TGeoShape::Big();
      return dist; // OK
   }
   Double_t ainv = 1./a;
   Double_t sum = - b*ainv;
   Double_t prod = c*ainv;
   Double_t delta = sum*sum - 4.*prod;
   if (delta<0) return dist; // big
   delta = TMath::Sqrt(delta);
   Double_t sone = TMath::Sign(1.,ainv);
   Int_t i = -1;
   while (i<2) {
      dist = 0.5*(sum+i*sone*delta);
      i += 2;
      if (dist<0) continue;
      if (dist<1.E-8) {
         Double_t talf = -2.*fA*TMath::Sqrt(rsq);
         Double_t phi = TMath::ATan2(point[1], point[0]);
         Double_t ndotd = talf*(TMath::Cos(phi)*dir[0]+TMath::Sin(phi)*dir[1])+dir[2];
         if (!in) ndotd *= -1;
         if (ndotd<0) return dist;
      } else return dist;
   }
   return TGeoShape::Big();
}
 
////////////////////////////////////////////////////////////////////////////////
/// compute distance from inside point to surface of the paraboloid
 
Double_t TGeoParaboloid::DistFromInside(const Double_t *point, const Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
   if (iact<3 && safe) {
   // compute safe distance
      *safe = Safety(point, kTRUE);
      if (iact==0) return TGeoShape::Big();
      if (iact==1 && step<*safe) return TGeoShape::Big();
   }
 
   Double_t dz = TGeoShape::Big();
   if (dir[2]<0) {
      dz = -(point[2]+fDz)/dir[2];
   } else if (dir[2]>0) {
      dz = (fDz-point[2])/dir[2];
   }
   Double_t dpara = DistToParaboloid(point, dir, kTRUE);
   return TMath::Min(dz, dpara);
}
 
////////////////////////////////////////////////////////////////////////////////
/// compute distance from outside point to surface of the paraboloid and safe distance
 
Double_t TGeoParaboloid::DistFromOutside(const Double_t *point, const Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
   if (iact<3 && safe) {
   // compute safe distance
      *safe = Safety(point, kFALSE);
      if (iact==0) return TGeoShape::Big();
      if (iact==1 && step<*safe) return TGeoShape::Big();
   }
   Double_t xnew, ynew, znew;
   if (point[2]<=-fDz) {
      if (dir[2]<=0) return TGeoShape::Big();
      Double_t snxt = -(fDz+point[2])/dir[2];
      // find extrapolated X and Y
      xnew = point[0]+snxt*dir[0];
      ynew = point[1]+snxt*dir[1];
      if ((xnew*xnew+ynew*ynew) <= fRlo*fRlo) return snxt;
   } else if (point[2]>=fDz) {
      if (dir[2]>=0) return TGeoShape::Big();
      Double_t snxt = (fDz-point[2])/dir[2];
      // find extrapolated X and Y
      xnew = point[0]+snxt*dir[0];
      ynew = point[1]+snxt*dir[1];
      if ((xnew*xnew+ynew*ynew) <= fRhi*fRhi) return snxt;
   }
   Double_t snxt = DistToParaboloid(point, dir, kFALSE);
   if (snxt > 1E20) return snxt;
   znew = point[2]+snxt*dir[2];
   if (TMath::Abs(znew) <= fDz) return snxt;
   return TGeoShape::Big();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Divide the paraboloid along one axis.
 
TGeoVolume *TGeoParaboloid::Divide(TGeoVolume * /*voldiv*/, const char * /*divname*/, Int_t /*iaxis*/, Int_t /*ndiv*/,
                             Double_t /*start*/, Double_t /*step*/)
{
   Error("Divide", "Paraboloid divisions not implemented");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Fill vector param[4] with the bounding cylinder parameters. The order
/// is the following : Rmin, Rmax, Phi1, Phi2
 
void TGeoParaboloid::GetBoundingCylinder(Double_t *param) const
{
   param[0] = 0.;                  // Rmin
   param[1] = fDX;                 // Rmax
   param[1] *= param[1];
   param[2] = 0.;                  // Phi1
   param[3] = 360.;                // Phi2
}
 
////////////////////////////////////////////////////////////////////////////////
/// in case shape has some negative parameters, these has to be computed
/// in order to fit the mother
 
TGeoShape *TGeoParaboloid::GetMakeRuntimeShape(TGeoShape *, TGeoMatrix *) const
{
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// print shape parameters
 
void TGeoParaboloid::InspectShape() const
{
   printf("*** Shape %s: TGeoParaboloid ***\n", GetName());
   printf("    rlo    = %11.5f\n", fRlo);
   printf("    rhi    = %11.5f\n", fRhi);
   printf("    dz     = %11.5f\n", fDz);
   printf(" Bounding box:\n");
   TGeoBBox::InspectShape();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Creates a TBuffer3D describing *this* shape.
/// Coordinates are in local reference frame.
 
TBuffer3D *TGeoParaboloid::MakeBuffer3D() const
{
   Int_t n = gGeoManager->GetNsegments();
   Int_t nbPnts = n*(n+1)+2;
   Int_t nbSegs = n*(2*n+3);
   Int_t nbPols = n*(n+2);
 
   TBuffer3D* buff = new TBuffer3D(TBuffer3DTypes::kGeneric,
                                   nbPnts, 3*nbPnts, nbSegs, 3*nbSegs, nbPols, 2*n*5 + n*n*6);
 
   if (buff)
   {
      SetPoints(buff->fPnts);
      SetSegsAndPols(*buff);
   }
 
   return buff;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Fill TBuffer3D structure for segments and polygons.
 
void TGeoParaboloid::SetSegsAndPols(TBuffer3D &buff) const
{
   Int_t indx, i, j;
   Int_t n = gGeoManager->GetNsegments();
 
   Int_t c = GetBasicColor();
 
   Int_t nn1 = (n+1)*n+1;
   indx = 0;
   // Lower end-cap (n radial segments)
   for (j=0; j<n; j++) {
      buff.fSegs[indx++] = c+2;
      buff.fSegs[indx++] = 0;
      buff.fSegs[indx++] = j+1;
   }
   // Sectors (n)
   for (i=0; i<n+1; i++) {
      // lateral (circles) segments (n)
      for (j=0; j<n; j++) {
         buff.fSegs[indx++] = c;
         buff.fSegs[indx++] = n*i+1+j;
         buff.fSegs[indx++] = n*i+1+((j+1)%n);
      }
      if (i==n) break;  // skip i=n for generators
      // generator segments (n)
      for (j=0; j<n; j++) {
         buff.fSegs[indx++] = c;
         buff.fSegs[indx++] = n*i+1+j;
         buff.fSegs[indx++] = n*(i+1)+1+j;
      }
   }
   // Upper end-cap
   for (j=0; j<n; j++) {
      buff.fSegs[indx++] = c+1;
      buff.fSegs[indx++] = n*n+1+j;
      buff.fSegs[indx++] = nn1;
   }
 
   indx = 0;
 
   // lower end-cap (n polygons)
   for (j=0; j<n; j++) {
      buff.fPols[indx++] = c+2;
      buff.fPols[indx++] = 3;
      buff.fPols[indx++] = n+j;
      buff.fPols[indx++] = (j+1)%n;
      buff.fPols[indx++] = j;
   }
   // Sectors (n)
   for (i=0; i<n; i++) {
      // lateral faces (n)
      for (j=0; j<n; j++) {
         buff.fPols[indx++] = c;
         buff.fPols[indx++] = 4;
         buff.fPols[indx++] = (2*i+1)*n+j;
         buff.fPols[indx++] = 2*(i+1)*n+j;
         buff.fPols[indx++] = (2*i+3)*n+j;
         buff.fPols[indx++] = 2*(i+1)*n+((j+1)%n);
      }
   }
   // upper end-cap (n polygons)
   for (j=0; j<n; j++) {
      buff.fPols[indx++] = c+1;
      buff.fPols[indx++] = 3;
      buff.fPols[indx++] = 2*n*(n+1)+j;
      buff.fPols[indx++] = 2*n*(n+1)+((j+1)%n);
      buff.fPols[indx++] = (2*n+1)*n+j;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Computes the closest distance from given point to this shape.
 
Double_t TGeoParaboloid::Safety(const Double_t *point, Bool_t in) const
{
   Double_t safz = fDz-TMath::Abs(point[2]);
   if (!in) safz = -safz;
   Double_t safr;
   Double_t rsq = point[0]*point[0]+point[1]*point[1];
   Double_t z0 = fA*rsq+fB;
   Double_t r0sq = (point[2]-fB)/fA;
   if (r0sq<0) {
      if (in) return 0.;
      return safz;
   }
   Double_t dr = TMath::Sqrt(rsq)-TMath::Sqrt(r0sq);
   if (in) {
      if (dr>-1.E-8) return 0.;
      Double_t dz = TMath::Abs(point[2]-z0);
      safr = -dr*dz/TMath::Sqrt(dr*dr+dz*dz);
   } else {
      if (dr<1.E-8) return safz;
      Double_t talf = -2.*fA*TMath::Sqrt(r0sq);
      Double_t salf = talf/TMath::Sqrt(1.+talf*talf);
      safr = TMath::Abs(dr*salf);
   }
   if (in) return TMath::Min(safr,safz);
   return TMath::Max(safr,safz);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set paraboloid dimensions.
 
void TGeoParaboloid::SetParaboloidDimensions(Double_t rlo, Double_t rhi, Double_t dz)
{
   if ((rlo<0) || (rhi<0) || (dz<=0) || TMath::Abs(rlo-rhi)<TGeoShape::Tolerance()) {
      SetShapeBit(kGeoRunTimeShape);
      Error("SetParaboloidDimensions", "Dimensions of %s invalid: check (rlo>=0) (rhi>=0) (rlo!=rhi) dz>0",GetName());
      return;
   }
   fRlo = rlo;
   fRhi = rhi;
   fDz  = dz;
   Double_t dd = 1./(fRhi*fRhi - fRlo*fRlo);
   fA = 2.*fDz*dd;
   fB = - fDz * (fRlo*fRlo + fRhi*fRhi)*dd;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set paraboloid dimensions starting from an array.
 
void TGeoParaboloid::SetDimensions(Double_t *param)
{
   Double_t rlo    = param[0];
   Double_t rhi    = param[1];
   Double_t dz     = param[2];
   SetParaboloidDimensions(rlo, rhi, dz);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create paraboloid mesh points.
/// ~~~ {.cpp}
/// Npoints = n*(n+1) + 2
///     ifirst = 0
///     ipoint(i,j) = 1+i*n+j;                              i=[0,n]  j=[0,n-1]
///     ilast = 1+n*(n+1)
/// Nsegments = n*(2*n+3)
///     lower: (0, j+1);                                    j=[0,n-1]
///     circle(i): (n*i+1+j, n*i+1+(j+1)%n);                i=[0,n]  j=[0,n-1]
///     generator(i): (n*i+1+j, n*(i+1)+1+j);               i,j=[0,n-1]
///     upper: (n*n+1+j, (n+1)*n+1)                           j=[0,n-1]
/// Npolygons = n*(n+2)
///     lower: (n+j, (j+1)%n, j)                              j=[0,n-1]
///     lateral(i): ((2*i+1)*n+j, 2*(i+1)*n+j, (2*i+3)*n+j, 2*(i+1)*n+(j+1)%n)
///                                                        i,j = [0,n-1]
///     upper: ((2n+1)*n+j, 2*n*(n+1)+(j+1)%n, 2*n*(n+1)+j)   j=[0,n-1]
/// ~~~
 
void TGeoParaboloid::SetPoints(Double_t *points) const
{
   if (!points) return;
   Double_t ttmin, ttmax;
   ttmin = TMath::ATan2(-fDz, fRlo);
   ttmax = TMath::ATan2(fDz, fRhi);
   Int_t n = gGeoManager->GetNsegments();
   Double_t dtt = (ttmax-ttmin)/n;
   Double_t dphi = 360./n;
   Double_t tt;
   Double_t r, z, delta;
   Double_t phi, sph, cph;
   Int_t indx = 0;
   // center of the lower endcap:
   points[indx++] = 0; // x
   points[indx++] = 0; // y
   points[indx++] = -fDz;
   for (Int_t i=0; i<n+1; i++) {  // nz planes = n+1
      if (i==0) {
         r = fRlo;
         z = -fDz;
      } else if (i==n) {
         r = fRhi;
         z = fDz;
      } else {
         tt = TMath::Tan(ttmin + i*dtt);
         delta = tt*tt - 4*fA*fB; // should be always positive (a*b<0)
         r = 0.5*(tt+TMath::Sqrt(delta))/fA;
         z = r*tt;
      }
      for (Int_t j=0; j<n; j++) {
         phi = j*dphi*TMath::DegToRad();
         sph=TMath::Sin(phi);
         cph=TMath::Cos(phi);
         points[indx++] = r*cph;
         points[indx++] = r*sph;
         points[indx++] = z;
      }
   }
   // center of the upper endcap
   points[indx++] = 0; // x
   points[indx++] = 0; // y
   points[indx++] = fDz;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns numbers of vertices, segments and polygons composing the shape mesh.
 
void TGeoParaboloid::GetMeshNumbers(Int_t &nvert, Int_t &nsegs, Int_t &npols) const
{
   Int_t n = gGeoManager->GetNsegments();
   nvert = n*(n+1)+2;
   nsegs = n*(2*n+3);
   npols = n*(n+2);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns number of vertices on the paraboloid mesh.
 
Int_t TGeoParaboloid::GetNmeshVertices() const
{
   Int_t n = gGeoManager->GetNsegments();
   return (n*(n+1)+2);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save a primitive as a C++ statement(s) on output stream "out".
 
void TGeoParaboloid::SavePrimitive(std::ostream &out, Option_t * /*option*/ /*= ""*/)
{
   if (TObject::TestBit(kGeoSavePrimitive)) return;
   out << "   // Shape: " << GetName() << " type: " << ClassName() << std::endl;
   out << "   rlo = " << fRlo << ";" << std::endl;
   out << "   rhi = " << fRhi << ";" << std::endl;
   out << "   dz  = " << fDZ << ";" << std::endl;
   out << "   TGeoShape *" << GetPointerName() << " = new TGeoParaboloid(\"" << GetName() << "\", rlo,rhi,dz);" << std::endl;
   TObject::SetBit(TGeoShape::kGeoSavePrimitive);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create paraboloid mesh points.
 
void TGeoParaboloid::SetPoints(Float_t *points) const
{
   if (!points) return;
   Double_t ttmin, ttmax;
   ttmin = TMath::ATan2(-fDz, fRlo);
   ttmax = TMath::ATan2(fDz, fRhi);
   Int_t n = gGeoManager->GetNsegments();
   Double_t dtt = (ttmax-ttmin)/n;
   Double_t dphi = 360./n;
   Double_t tt;
   Double_t r, z, delta;
   Double_t phi, sph, cph;
   Int_t indx = 0;
   // center of the lower endcap:
   points[indx++] = 0; // x
   points[indx++] = 0; // y
   points[indx++] = -fDz;
   for (Int_t i=0; i<n+1; i++) {  // nz planes = n+1
      if (i==0) {
         r = fRlo;
         z = -fDz;
      } else if (i==n) {
         r = fRhi;
         z = fDz;
      } else {
         tt = TMath::Tan(ttmin + i*dtt);
         delta = tt*tt - 4*fA*fB; // should be always positive (a*b<0)
         r = 0.5*(tt+TMath::Sqrt(delta))/fA;
         z = r*tt;
      }
      for (Int_t j=0; j<n; j++) {
         phi = j*dphi*TMath::DegToRad();
         sph=TMath::Sin(phi);
         cph=TMath::Cos(phi);
         points[indx++] = r*cph;
         points[indx++] = r*sph;
         points[indx++] = z;
      }
   }
   // center of the upper endcap
   points[indx++] = 0; // x
   points[indx++] = 0; // y
   points[indx++] = fDz;
}
 
////////////////////////////////////////////////////////////////////////////////
void TGeoParaboloid::Sizeof3D() const
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Fills a static 3D buffer and returns a reference.
 
const TBuffer3D & TGeoParaboloid::GetBuffer3D(Int_t reqSections, Bool_t localFrame) const
{
   static TBuffer3D buffer(TBuffer3DTypes::kGeneric);
   TGeoBBox::FillBuffer3D(buffer, reqSections, localFrame);
 
   if (reqSections & TBuffer3D::kRawSizes) {
      Int_t n = gGeoManager->GetNsegments();
      Int_t nbPnts = n*(n+1)+2;
      Int_t nbSegs = n*(2*n+3);
      Int_t nbPols = n*(n+2);
      if (buffer.SetRawSizes(nbPnts, 3*nbPnts, nbSegs, 3*nbSegs, nbPols, 2*n*5 + n*n*6)) {
         buffer.SetSectionsValid(TBuffer3D::kRawSizes);
      }
   }
   if ((reqSections & TBuffer3D::kRaw) && buffer.SectionsValid(TBuffer3D::kRawSizes)) {
      SetPoints(buffer.fPnts);
      if (!buffer.fLocalFrame) {
         TransformPoints(buffer.fPnts, buffer.NbPnts());
      }
      SetSegsAndPols(buffer);
      buffer.SetSectionsValid(TBuffer3D::kRaw);
   }
 
   return buffer;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check the inside status for each of the points in the array.
/// Input: Array of point coordinates + vector size
/// Output: Array of Booleans for the inside of each point
 
void TGeoParaboloid::Contains_v(const Double_t *points, Bool_t *inside, Int_t vecsize) const
{
   for (Int_t i=0; i<vecsize; i++) inside[i] = Contains(&points[3*i]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute the normal for an array o points so that norm.dot.dir is positive
/// Input: Arrays of point coordinates and directions + vector size
/// Output: Array of normal directions
 
void TGeoParaboloid::ComputeNormal_v(const Double_t *points, const Double_t *dirs, Double_t *norms, Int_t vecsize)
{
   for (Int_t i=0; i<vecsize; i++) ComputeNormal(&points[3*i], &dirs[3*i], &norms[3*i]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute distance from array of input points having directions specified by dirs. Store output in dists
 
void TGeoParaboloid::DistFromInside_v(const Double_t *points, const Double_t *dirs, Double_t *dists, Int_t vecsize, Double_t* step) const
{
   for (Int_t i=0; i<vecsize; i++) dists[i] = DistFromInside(&points[3*i], &dirs[3*i], 3, step[i]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute distance from array of input points having directions specified by dirs. Store output in dists
 
void TGeoParaboloid::DistFromOutside_v(const Double_t *points, const Double_t *dirs, Double_t *dists, Int_t vecsize, Double_t* step) const
{
   for (Int_t i=0; i<vecsize; i++) dists[i] = DistFromOutside(&points[3*i], &dirs[3*i], 3, step[i]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute safe distance from each of the points in the input array.
/// Input: Array of point coordinates, array of statuses for these points, size of the arrays
/// Output: Safety values
 
void TGeoParaboloid::Safety_v(const Double_t *points, const Bool_t *inside, Double_t *safe, Int_t vecsize) const
{
   for (Int_t i=0; i<vecsize; i++) safe[i] = Safety(&points[3*i], inside[i]);
}