// @(#)root/geom:$Name:  $:$Id: TGeoBBox.cxx,v 1.46 2005/09/04 15:12:08 brun Exp $// Author: Andrei Gheata   24/10/01

// Contains() and DistFromOutside/Out() implemented by Mihaela Gheata

/*************************************************************************
 * 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.             *
 *************************************************************************/

//--------------------------------------------------------------------------
// TGeoBBox - box class. All shape primitives inherit from this, their 
//   constructor filling automatically the parameters of the box that bounds
//   the given shape. Defined by 6 parameters :
//      fDX, fDY, fDZ - half lengths on X, Y and Z axis
//      fOrigin[3]    - position of box origin
//
//--------------------------------------------------------------------------
//
//
//--- Building boxes
//  ==================
//  Normally a box has to be build only with 3 parameters : dx, dy, dz
// representing the half lengths on X, Y and Z axis. In this case, the origin 
// of the box will match the one of its reference frame. The translation of the
// origin is used only by the constructors of all other shapes in order to
// define their own bounding boxes. Users should be aware that building a
// translated box that will represent a physical shape by itself will affect any
// further positioning of other shapes inside. Therefore in order to build a
// positioned box one should follow the recipe described in class TGeoNode.
//
// Creation of boxes
// 1.   TGeoBBox *box = new TGeoBBox("BOX", 20, 30, 40);
//

//
// 2. A volume having a box shape can be built in one step:
//      TGeoVolume *vbox = gGeoManager->MakeBox("vbox", ptrMed, 20,30,40);
//
// Divisions of boxes.
//
//   Volumes having box shape can be divided with equal-length slices on 
// X, Y or Z axis. The following options are supported:
// a) Dividing the full range of one axis in N slices
//      TGeoVolume *divx = vbox->Divide("SLICEX", 1, N);
//   - here 1 stands for the division axis (1-X, 2-Y, 3-Z)
//

//
// b) Dividing in a limited range - general case.
//      TGeoVolume *divy = vbox->Divide("SLICEY",2,N,start,step);
//   - start = starting offset within (-fDY, fDY)
//   - step  = slicing step
//
//

//
// Both cases are supported by all shapes.
//   See also class TGeoShape for utility methods provided by any particular 
// shape.
//_____________________________________________________________________________

#include "Riostream.h"
#include "TROOT.h"

#include "TGeoManager.h"
#include "TGeoVolume.h"
#include "TVirtualGeoPainter.h"
#include "TGeoBBox.h"
#include "TVirtualPad.h"
#include "TBuffer3D.h"
#include "TBuffer3DTypes.h"

ClassImp(TGeoBBox)
   
//_____________________________________________________________________________
 TGeoBBox::TGeoBBox()
{
// Default constructor
   SetShapeBit(TGeoShape::kGeoBox);
   fDX = fDY = fDZ = 0;
   for (Int_t i=0; i<3; i++)
      fOrigin[i] = 0;
}   

//_____________________________________________________________________________
 TGeoBBox::TGeoBBox(Double_t dx, Double_t dy, Double_t dz, Double_t *origin)
         :TGeoShape("")
{
// Constructor
   SetShapeBit(TGeoShape::kGeoBox);
   SetBoxDimensions(dx, dy, dz, origin);
}

//_____________________________________________________________________________
 TGeoBBox::TGeoBBox(const char *name, Double_t dx, Double_t dy, Double_t dz, Double_t *origin)
         :TGeoShape(name)
{
// Constructor
   SetShapeBit(TGeoShape::kGeoBox);
   SetBoxDimensions(dx, dy, dz, origin);
}

//_____________________________________________________________________________
 TGeoBBox::TGeoBBox(Double_t *param)
         :TGeoShape("")
{
// constructor based on the array of parameters
// param[0] - half-length in x
// param[1] - half-length in y
// param[2] - half-length in z
   SetShapeBit(TGeoShape::kGeoBox);
   SetDimensions(param);
}   

//_____________________________________________________________________________
 TGeoBBox::~TGeoBBox()
{
// Destructor
}

//_____________________________________________________________________________
 void TGeoBBox::ComputeNormal(Double_t *point, Double_t *dir, Double_t *norm)
{
// Compute normal to closest surface from POINT. 
   memset(norm,0,3*sizeof(Double_t));
   Double_t saf[3];
   Int_t i;
   saf[0]=TMath::Abs(TMath::Abs(point[0]-fOrigin[0])-fDX);
   saf[1]=TMath::Abs(TMath::Abs(point[1]-fOrigin[1])-fDY);
   saf[2]=TMath::Abs(TMath::Abs(point[2]-fOrigin[2])-fDZ);
   i = TMath::LocMin(3,saf);
   norm[i] = (dir[i]>0)?1:(-1);
}

//_____________________________________________________________________________
 Bool_t TGeoBBox::CouldBeCrossed(Double_t *point, Double_t *dir) const
{
// decide fast if the bounding box could be crossed by a vector
   Double_t mind = fDX;
   if (fDY<mind) mind=fDY;
   if (fDZ<mind) mind=fDZ;
   Double_t dx = fOrigin[0]-point[0];
   Double_t dy = fOrigin[1]-point[1];
   Double_t dz = fOrigin[2]-point[2];
   Double_t do2 = dx*dx+dy*dy+dz*dz;
   if (do2<=(mind*mind)) return kTRUE;
   Double_t rmax2 = fDX*fDX+fDY*fDY+fDZ*fDZ;
   if (do2<=rmax2) return kTRUE;
   // inside bounding sphere
   Double_t doct = dx*dir[0]+dy*dir[1]+dz*dir[2];
   // leaving ray
   if (doct<=0) return kFALSE;
   Double_t dirnorm=dir[0]*dir[0]+dir[1]*dir[1]+dir[2]*dir[2];   
   if ((doct*doct)>=(do2-rmax2)*dirnorm) return kTRUE;
   return kFALSE;
}

//_____________________________________________________________________________
 Int_t TGeoBBox::DistancetoPrimitive(Int_t px, Int_t py)
{
// compute closest distance from point px,py to each corner
   const Int_t numPoints = 8;
   return ShapeDistancetoPrimitive(numPoints, px, py);
}

//_____________________________________________________________________________
 TGeoVolume *TGeoBBox::Divide(TGeoVolume *voldiv, const char *divname, Int_t iaxis, Int_t ndiv, 
                             Double_t start, Double_t step) 
{
//--- Divide this box shape belonging to volume "voldiv" into ndiv equal volumes
// called divname, from start position with the given step. Returns pointer
// to created division cell volume. In case a wrong division axis is supplied,
// returns pointer to volume to be divided.
   TGeoShape *shape;           //--- shape to be created
   TGeoVolume *vol;            //--- division volume to be created
   TGeoVolumeMulti *vmulti;    //--- generic divided volume
   TGeoPatternFinder *finder;  //--- finder to be attached
   TString opt = "";           //--- option to be attached
   Double_t end = start+ndiv*step;
   switch (iaxis) {
      case 1:                  //--- divide on X
         shape = new TGeoBBox(step/2., fDY, fDZ); 
         finder = new TGeoPatternX(voldiv, ndiv, start, end);
         opt = "X";
         break;
      case 2:                  //--- divide on Y
         shape = new TGeoBBox(fDX, step/2., fDZ); 
         finder = new TGeoPatternY(voldiv, ndiv, start, end);
         opt = "Y";
         break;
      case 3:                  //--- divide on Z
         shape = new TGeoBBox(fDX, fDY, step/2.); 
         finder = new TGeoPatternZ(voldiv, ndiv, start, end);
         opt = "Z";
         break;
      default:
         Error("Divide", "Wrong axis type for division");
         return 0;
   }
   vol = new TGeoVolume(divname, shape, voldiv->GetMedium());
   vmulti = gGeoManager->MakeVolumeMulti(divname, voldiv->GetMedium());
   vmulti->AddVolume(vol);
   voldiv->SetFinder(finder);
   finder->SetDivIndex(voldiv->GetNdaughters());
   for (Int_t ic=0; ic<ndiv; ic++) {
      voldiv->AddNodeOffset(vol, ic, start+step/2.+ic*step, opt.Data());
      ((TGeoNodeOffset*)voldiv->GetNodes()->At(voldiv->GetNdaughters()-1))->SetFinder(finder);
   }
   return vmulti;
}     

//_____________________________________________________________________________
 void TGeoBBox::ComputeBBox()
{
// compute bounding box - already computed in this case
}   

//_____________________________________________________________________________
 Bool_t TGeoBBox::Contains(Double_t *point) const
{
// test if point is inside this shape
   if (TMath::Abs(point[2]-fOrigin[2]) > fDZ) return kFALSE;
   if (TMath::Abs(point[0]-fOrigin[0]) > fDX) return kFALSE;
   if (TMath::Abs(point[1]-fOrigin[1]) > fDY) return kFALSE;
   return kTRUE;
}

//_____________________________________________________________________________
 Double_t TGeoBBox::DistFromInside(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
// Compute distance from inside point to surface of the box.
// Boundary safe algorithm.
   Double_t s,smin,saf[6];
   Double_t newpt[3];
   Int_t i;
   for (i=0; i<3; i++) newpt[i] = point[i] - fOrigin[i];
   saf[0] = fDX+newpt[0];
   saf[1] = fDX-newpt[0];
   saf[2] = fDY+newpt[1];
   saf[3] = fDY-newpt[1];
   saf[4] = fDZ+newpt[2];
   saf[5] = fDZ-newpt[2];
   if (iact<3 && safe) {
      smin = saf[0];
      // compute safe distance
      for (i=1;i<6;i++) if (saf[i] < smin) smin = saf[i];
      *safe = smin;
      if (smin<0) *safe = 0.0;
      if (iact==0) return TGeoShape::Big();
      if (iact==1 && step<*safe) return TGeoShape::Big();
   }
   // compute distance to surface
   smin=TGeoShape::Big();
   for (i=0; i<3; i++) {
      if (dir[i]!=0) {
         s = (dir[i]>0)?(saf[(i<<1)+1]/dir[i]):(-saf[i<<1]/dir[i]);
         if (s < 0) return 0.0;
         if (s < smin) smin = s;
      }
   }
   return smin;
}

//_____________________________________________________________________________
 Double_t TGeoBBox::DistFromOutside(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
// Compute distance from outside point to surface of the box.
// Boundary safe algorithm.
   Bool_t in = kTRUE;
   Double_t saf[3];
   Double_t par[3];
   Double_t newpt[3];
   Int_t i,j;
   for (i=0; i<3; i++) newpt[i] = point[i] - fOrigin[i];
   par[0] = fDX;
   par[1] = fDY;
   par[2] = fDZ;
   for (i=0; i<3; i++) {
      saf[i] = TMath::Abs(newpt[i])-par[i];
      if (in && saf[i]>0) in=kFALSE;
   }   
   if (iact<3 && safe) {
      // compute safe distance
      if (in) {
         *safe = 0.0;
      } else {   
         *safe = saf[0];
         if (saf[1] > *safe) *safe = saf[1];
         if (saf[2] > *safe) *safe = saf[2];
      }   
      if (iact==0) return TGeoShape::Big();
      if (iact==1 && step<*safe) return TGeoShape::Big();
   }
   // compute distance from point to box
   Double_t coord, snxt=TGeoShape::Big();
   Int_t ibreak=0;
   // protection in case point is actually inside box
   if (in) {
      j = 0;
      Double_t ss = saf[0];
      if (saf[1]>ss) {
         ss = saf[1];
         j = 1;
      }
      if (saf[2]>ss) j = 2;
      if (newpt[j]*dir[j]>0) return TGeoShape::Big(); // in fact exiting
      return 0.0;   
   }
   for (i=0; i<3; i++) {
      if (saf[i]<0) continue;
      if (newpt[i]*dir[i] >= 0) continue;
      snxt = saf[i]/TMath::Abs(dir[i]);
      ibreak = 0;
      for (j=0; j<3; j++) {
         if (j==i) continue;
         coord=newpt[j]+snxt*dir[j];
         if (TMath::Abs(coord)>par[j]) {
            ibreak=1;
            break;
         }
      }
      if (!ibreak) return snxt;
   }
   return TGeoShape::Big();
}

//_____________________________________________________________________________
 const char *TGeoBBox::GetAxisName(Int_t iaxis) const
{
// Returns name of axis IAXIS.
   switch (iaxis) {
      case 1:
         return "X";
      case 2:
         return "Y";
      case 3:
         return "Z";
      default:
         return "UNDEFINED";
   }
}   

//_____________________________________________________________________________
 Double_t TGeoBBox::GetAxisRange(Int_t iaxis, Double_t &xlo, Double_t &xhi) const
{
// Get range of shape for a given axis.
   xlo = 0;
   xhi = 0;
   Double_t dx = 0;
   switch (iaxis) {
      case 1:
         xlo = fOrigin[0]-fDX;
         xhi = fOrigin[0]+fDX;
         dx = 2*fDX;
         return dx;
      case 2:
         xlo = fOrigin[1]-fDY;
         xhi = fOrigin[1]+fDY;
         dx = 2*fDY;
         return dx;
      case 3:
         xlo = fOrigin[2]-fDZ;
         xhi = fOrigin[2]+fDZ;
         dx = 2*fDZ;
         return dx;
   }
   return dx;
}         
            
//_____________________________________________________________________________
 void TGeoBBox::GetBoundingCylinder(Double_t *param) const
{
//--- Fill vector param[4] with the bounding cylinder parameters. The order
// is the following : Rmin, Rmax, Phi1, Phi2
   param[0] = 0.;                  // Rmin
   param[1] = fDX*fDX+fDY*fDY;     // Rmax
   param[2] = 0.;                  // Phi1
   param[3] = 360.;                // Phi2
}

//_____________________________________________________________________________
 Int_t TGeoBBox::GetFittingBox(const TGeoBBox *parambox, TGeoMatrix *mat, Double_t &dx, Double_t &dy, Double_t &dz) const
{
// Fills real parameters of a positioned box inside this one. Returns 0 if successfull.
   dx=dy=dz=0;
   if (mat->IsRotation()) {
      Error("GetFittingBox", "cannot handle parametrized rotated volumes");
      return 1; // ### rotation not accepted ###
   }
   //--> translate the origin of the parametrized box to the frame of this box.
   Double_t origin[3];
   mat->LocalToMaster(parambox->GetOrigin(), origin);
   if (!Contains(origin)) {
      Error("GetFittingBox", "wrong matrix - parametrized box is outside this");
      return 1; // ### wrong matrix ###
   }
   //--> now we have to get the valid range for all parametrized axis
   Double_t xlo=0, xhi=0;
   Double_t dd[3];
   dd[0] = parambox->GetDX();
   dd[1] = parambox->GetDY();
   dd[2] = parambox->GetDZ();
   for (Int_t iaxis=0; iaxis<3; iaxis++) {
      if (dd[iaxis]>=0) continue;
      TGeoBBox::GetAxisRange(iaxis+1, xlo, xhi);
      //-> compute best fitting parameter
      dd[iaxis] = TMath::Min(origin[iaxis]-xlo, xhi-origin[iaxis]); 
      if (dd[iaxis]<0) {
         Error("GetFittingBox", "wrong matrix");
         return 1;
      }   
   }
   dx = dd[0];
   dy = dd[1];
   dz = dd[2];
   return 0;
}

//_____________________________________________________________________________
 TGeoShape *TGeoBBox::GetMakeRuntimeShape(TGeoShape *mother, TGeoMatrix *mat) const
{
// in case shape has some negative parameters, these has to be computed
// in order to fit the mother
   if (!TestShapeBit(kGeoRunTimeShape)) return 0;
   Double_t dx, dy, dz;
   Int_t ierr = mother->GetFittingBox(this, mat, dx, dy, dz);
   if (ierr) {
      Error("GetMakeRuntimeShape", "cannot fit this to mother");
      return 0;
   }   
   return (new TGeoBBox(dx, dy, dz));
}

//_____________________________________________________________________________
 void TGeoBBox::InspectShape() const
{
// print shape parameters
   printf("*** Shape %s: TGeoBBox ***\n", GetName());
   printf("    dX = %11.5f\n", fDX);
   printf("    dY = %11.5f\n", fDY);
   printf("    dZ = %11.5f\n", fDZ);
   printf("    origin: x=%11.5f y=%11.5f z=%11.5f\n", fOrigin[0], fOrigin[1], fOrigin[2]);
}

//_____________________________________________________________________________
 TBuffer3D *TGeoBBox::MakeBuffer3D() const
{
   // Creates a TBuffer3D describing *this* shape.
   // Coordinates are in local reference frame.   
   TBuffer3D* buff = new TBuffer3D(TBuffer3DTypes::kGeneric,
                                   8, 3*8,      // Points 
                                   12, 3*12,    // Segments
                                   6, 6*6);     // Polygons
   if (buff)
   {
      SetPoints(buff->fPnts);
      SetSegsAndPols(*buff);
   }

   return buff;   
}

//_____________________________________________________________________________
 void TGeoBBox::SetSegsAndPols(TBuffer3D &buff) const
{
// Fill TBuffer3D structure for segments and polygons.
   Int_t c = GetBasicColor();
   
   buff.fSegs[ 0] = c   ; buff.fSegs[ 1] = 0   ; buff.fSegs[ 2] = 1   ;
   buff.fSegs[ 3] = c+1 ; buff.fSegs[ 4] = 1   ; buff.fSegs[ 5] = 2   ;
   buff.fSegs[ 6] = c+1 ; buff.fSegs[ 7] = 2   ; buff.fSegs[ 8] = 3   ;
   buff.fSegs[ 9] = c   ; buff.fSegs[10] = 3   ; buff.fSegs[11] = 0   ;
   buff.fSegs[12] = c+2 ; buff.fSegs[13] = 4   ; buff.fSegs[14] = 5   ;
   buff.fSegs[15] = c+2 ; buff.fSegs[16] = 5   ; buff.fSegs[17] = 6   ;
   buff.fSegs[18] = c+3 ; buff.fSegs[19] = 6   ; buff.fSegs[20] = 7   ;
   buff.fSegs[21] = c+3 ; buff.fSegs[22] = 7   ; buff.fSegs[23] = 4   ;
   buff.fSegs[24] = c   ; buff.fSegs[25] = 0   ; buff.fSegs[26] = 4   ;
   buff.fSegs[27] = c+2 ; buff.fSegs[28] = 1   ; buff.fSegs[29] = 5   ;
   buff.fSegs[30] = c+1 ; buff.fSegs[31] = 2   ; buff.fSegs[32] = 6   ;
   buff.fSegs[33] = c+3 ; buff.fSegs[34] = 3   ; buff.fSegs[35] = 7   ;
   
   buff.fPols[ 0] = c   ; buff.fPols[ 1] = 4   ;  buff.fPols[ 2] = 0  ;
   buff.fPols[ 3] = 9   ; buff.fPols[ 4] = 4   ;  buff.fPols[ 5] = 8  ;
   buff.fPols[ 6] = c+1 ; buff.fPols[ 7] = 4   ;  buff.fPols[ 8] = 1  ;
   buff.fPols[ 9] = 10  ; buff.fPols[10] = 5   ;  buff.fPols[11] = 9  ;
   buff.fPols[12] = c   ; buff.fPols[13] = 4   ;  buff.fPols[14] = 2  ;
   buff.fPols[15] = 11  ; buff.fPols[16] = 6   ;  buff.fPols[17] = 10 ;
   buff.fPols[18] = c+1 ; buff.fPols[19] = 4   ;  buff.fPols[20] = 3  ;
   buff.fPols[21] = 8   ; buff.fPols[22] = 7   ;  buff.fPols[23] = 11 ;
   buff.fPols[24] = c+2 ; buff.fPols[25] = 4   ;  buff.fPols[26] = 0  ;
   buff.fPols[27] = 3   ; buff.fPols[28] = 2   ;  buff.fPols[29] = 1  ;
   buff.fPols[30] = c+3 ; buff.fPols[31] = 4   ;  buff.fPols[32] = 4  ;
   buff.fPols[33] = 5   ; buff.fPols[34] = 6   ;  buff.fPols[35] = 7  ;
}

//_____________________________________________________________________________
 Double_t TGeoBBox::Safety(Double_t *point, Bool_t in) const
{
// computes the closest distance from given point to this shape, according
// to option. The matching point on the shape is stored in spoint.

   Double_t safe, safy, safz;
   if (in) {
      safe = fDX - TMath::Abs(point[0]-fOrigin[0]);
      safy = fDY - TMath::Abs(point[1]-fOrigin[1]);
      safz = fDZ - TMath::Abs(point[2]-fOrigin[2]);
      if (safy < safe) safe = safy;
      if (safz < safe) safe = safz;
   } else {
      safe = -fDX + TMath::Abs(point[0]-fOrigin[0]);
      safy = -fDY + TMath::Abs(point[1]-fOrigin[1]);
      safz = -fDZ + TMath::Abs(point[2]-fOrigin[2]);
      if (safy > safe) safe = safy;
      if (safz > safe) safe = safz;
   }
   return safe;
}

//_____________________________________________________________________________
 void TGeoBBox::SavePrimitive(ofstream &out, Option_t * /*option*/)
{
// Save a primitive as a C++ statement(s) on output stream "out".
   if (TObject::TestBit(kGeoSavePrimitive)) return;
   out << "   // Shape: " << GetName() << " type: " << ClassName() << endl;
   out << "   dx = " << fDX << ";" << endl;
   out << "   dy = " << fDY << ";" << endl;
   out << "   dz = " << fDZ << ";" << endl;
   if (fOrigin[0]!=0 || fOrigin[1]!=0 || fOrigin[2]!=0) { 
      out << "   origin[0] = " << fOrigin[0] << ";" << endl;
      out << "   origin[1] = " << fOrigin[1] << ";" << endl;
      out << "   origin[2] = " << fOrigin[2] << ";" << endl;
      out << "   TGeoShape *" << GetPointerName() << " = new TGeoBBox(\"" << GetName() << "\", dx,dy,dz,origin);" << endl;
   } else {   
      out << "   TGeoShape *" << GetPointerName() << " = new TGeoBBox(\"" << GetName() << "\", dx,dy,dz);" << endl;
   }
   TObject::SetBit(TGeoShape::kGeoSavePrimitive);
}         

//_____________________________________________________________________________
 void TGeoBBox::SetBoxDimensions(Double_t dx, Double_t dy, Double_t dz, Double_t *origin)
{
// set parameters of box
   fDX = dx;
   fDY = dy;
   fDZ = dz;
   for (Int_t i=0; i<3; i++) {
      if (!origin) {
         fOrigin[i] = 0.0;
      } else {
         fOrigin[i] = origin[i];
      }
   }
   if ((fDX==0) && (fDY==0) && (fDZ==0)) return;
   if ((fDX<0) || (fDY<0) || (fDZ<0)) {
      SetShapeBit(kGeoRunTimeShape);
//      printf("box : %f %f %f\n", fDX, fDY, fDZ);
   }
}        

//_____________________________________________________________________________
 void TGeoBBox::SetDimensions(Double_t *param)
{
// constructor based on the array of parameters
// param[0] - half-length in x
// param[1] - half-length in y
// param[2] - half-length in z
   if (!param) {
      Error("ctor", "null parameters");
      return;
   }
   fDX = param[0];
   fDY = param[1];
   fDZ = param[2];
   if ((fDX==0) && (fDY==0) && (fDZ==0)) return;
   if ((fDX<0) || (fDY<0) || (fDZ<0)) {
      SetShapeBit(kGeoRunTimeShape);
//      printf("box : %f %f %f\n", fDX, fDY, fDZ);
   }
}   

//_____________________________________________________________________________
 void TGeoBBox::SetBoxPoints(Double_t *points) const
{
   TGeoBBox::SetPoints(points);
}

//_____________________________________________________________________________
 void TGeoBBox::SetPoints(Double_t *points) const
{
// create box points
   if (!points) return;
   Double_t xmin,xmax,ymin,ymax,zmin,zmax;
   xmin = -fDX+fOrigin[0];
   xmax =  fDX+fOrigin[0];
   ymin = -fDY+fOrigin[1];
   ymax =  fDY+fOrigin[1];
   zmin = -fDZ+fOrigin[2];
   zmax =  fDZ+fOrigin[2];
   points[ 0] = xmin; points[ 1] = ymin; points[ 2] = zmin;
   points[ 3] = xmin; points[ 4] = ymax; points[ 5] = zmin;
   points[ 6] = xmax; points[ 7] = ymax; points[ 8] = zmin;
   points[ 9] = xmax; points[10] = ymin; points[11] = zmin;
   points[12] = xmin; points[13] = ymin; points[14] = zmax;
   points[15] = xmin; points[16] = ymax; points[17] = zmax;
   points[18] = xmax; points[19] = ymax; points[20] = zmax;
   points[21] = xmax; points[22] = ymin; points[23] = zmax;
}

//_____________________________________________________________________________
 void TGeoBBox::SetPoints(Float_t *points) const
{
// create box points
   if (!points) return;
   Double_t xmin,xmax,ymin,ymax,zmin,zmax;
   xmin = -fDX+fOrigin[0];
   xmax =  fDX+fOrigin[0];
   ymin = -fDY+fOrigin[1];
   ymax =  fDY+fOrigin[1];
   zmin = -fDZ+fOrigin[2];
   zmax =  fDZ+fOrigin[2];
   points[ 0] = xmin; points[ 1] = ymin; points[ 2] = zmin;
   points[ 3] = xmin; points[ 4] = ymax; points[ 5] = zmin;
   points[ 6] = xmax; points[ 7] = ymax; points[ 8] = zmin;
   points[ 9] = xmax; points[10] = ymin; points[11] = zmin;
   points[12] = xmin; points[13] = ymin; points[14] = zmax;
   points[15] = xmin; points[16] = ymax; points[17] = zmax;
   points[18] = xmax; points[19] = ymax; points[20] = zmax;
   points[21] = xmax; points[22] = ymin; points[23] = zmax;
}

//_____________________________________________________________________________
 void TGeoBBox::Sizeof3D() const
{
///// fill size of this 3-D object
///    TVirtualGeoPainter *painter = gGeoManager->GetGeomPainter();
///    if (painter) painter->AddSize3D(8, 12, 6);
}

//_____________________________________________________________________________
 const TBuffer3D & TGeoBBox::GetBuffer3D(Int_t reqSections, Bool_t localFrame) const
{
   static TBuffer3D buffer(TBuffer3DTypes::kGeneric);

   FillBuffer3D(buffer, reqSections, localFrame);

   // TODO: A box itself has has nothing more as already described
   // by bounding box. How will viewer interpret?
   if (reqSections & TBuffer3D::kRawSizes) {
      if (buffer.SetRawSizes(8, 3*8, 12, 3*12, 6, 6*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;
}

//_____________________________________________________________________________
 void TGeoBBox::FillBuffer3D(TBuffer3D & buffer, Int_t reqSections, Bool_t localFrame) const
{
   // Fill the supplied buffer, with sections in desired frame
   // See TBuffer3D.h for explanation of sections, frame etc.
   TGeoShape::FillBuffer3D(buffer, reqSections, localFrame);

   if (reqSections & TBuffer3D::kBoundingBox) {
      Double_t halfLengths[3] = { fDX, fDY, fDZ };
      buffer.SetAABoundingBox(fOrigin, halfLengths);

      if (!buffer.fLocalFrame) {
         TransformPoints(buffer.fBBVertex[0], 8);
      }
      buffer.SetSectionsValid(TBuffer3D::kBoundingBox);
    }
}