vv/vvSlicerManagerCommand.cxx

   1 /*=========================================================================
   2   Program:   vv                     http://www.creatis.insa-lyon.fr/rio/vv
   3
   4   Authors belong to:
   5   - University of LYON              http://www.universite-lyon.fr/
   6   - Léon Bérard cancer center       http://oncora1.lyon.fnclcc.fr
   7   - CREATIS CNRS laboratory         http://www.creatis.insa-lyon.fr
   8
   9   This software is distributed WITHOUT ANY WARRANTY; without even
  10   the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  11   PURPOSE.  See the copyright notices for more information.
  12
  13   It is distributed under dual licence
  14
  15   - BSD        See included LICENSE.txt file
  16   - CeCILL-B   http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html
  17 ======================================================================-====*/
  18 #include "vvSlicerManagerCommand.h"
  19 #include "vvSlicerManager.h"
  20
  21 #include <vtkTextProperty.h>
  22 #include <vtkRenderer.h>
  23 #include <vtkImageActor.h>
  24 #include <vtkRenderWindowInteractor.h>
  25 #include <vtkPropPicker.h>
  26 #include <vtkCamera.h>
  27 #include <vtkImageMapToWindowLevelColors.h>
  28 #include <vtkLookupTable.h>
  29 #include <vtkMath.h>
  30 #include <vtkAbstractPropPicker.h>
  31 #include <vtkAssemblyPath.h>
  32 #include <vtkCornerAnnotation.h>
  33 #include <vtkRenderWindow.h>
  34 #include <vvImage.h>
  35 #include <vtkImageReslice.h>
  36 #include "vvSlicer.h"
  37 #include "vvInteractorStyleNavigator.h"
  38 #include "vtkTransform.h"
  39
  40 #include <cmath>
  41
  42 //------------------------------------------------------------------------------
  43 vvSlicerManagerCommand::vvSlicerManagerCommand()
  44 {
  45   mStartSlicer = -1;
  46   mSlicerNumber=-1;
  47 }
  48 //------------------------------------------------------------------------------
  49
  50
  51 //------------------------------------------------------------------------------
  52 //return the num of the current slicer if visible (-1 else)
  53 int vvSlicerManagerCommand::FindSlicerNumber(vtkRenderWindow* renwin)
  54 {
  55   int rvalue;
  56   if (renwin != SM->GetSlicer(mSlicerNumber)->GetRenderWindow() ||
  57       !SM->GetSlicer(mSlicerNumber)->GetRenderer()->GetDraw())
  58     rvalue = -1;
  59   else rvalue = mSlicerNumber;
  60   //std::cerr << this << ":" << mSlicerNumber << ": " << rvalue << endl;
  61   return rvalue;
  62 }
  63 //------------------------------------------------------------------------------
  64
  65
  66 //------------------------------------------------------------------------------
  67 void vvSlicerManagerCommand::Execute(vtkObject *caller,
  68                                      unsigned long event,
  69                                      void *vtkNotUsed(callData))
  70 {
  71   //KeyPress event
  72   vvInteractorStyleNavigator *isi =
  73     dynamic_cast<vvInteractorStyleNavigator *>(caller);
  74   if (isi) {
  75     double x = isi->GetInteractor()->GetEventPosition()[0];
  76     double y = isi->GetInteractor()->GetEventPosition()[1];
  77     double z;
  78
  79     int VisibleInWindow = this->FindSlicerNumber(isi->GetInteractor()->GetRenderWindow());
  80     vtkRenderer* renderer=NULL;
  81     if (VisibleInWindow>-1)
  82       renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
  83     newLandmark = false;
  84
  85
  86
  87     if (event == vtkCommand::StartPickEvent && VisibleInWindow == -1) {
  88       for (int i = 0; i < this->SM->GetNumberOfSlicers(); i++) {
  89         if (this->SM->GetSlicer(i)->GetCursorVisibility()) {
  90           this->SM->GetSlicer(i)->SetCursorVisibility(0);
  91           this->SM->GetSlicer(i)->Render();
  92         }
  93       }
  94     }
  95     if ( VisibleInWindow > -1 ) {
  96       if (event == vtkCommand::KeyPressEvent) {
  97         std::string KeyPress = isi->GetInteractor()->GetKeySym();
  98         if (KeyPress == "Tab") {
  99           if(isi->GetInteractor()->GetShiftKey())
 100             this->SM->PrevImage(VisibleInWindow);
 101           else
 102             this->SM->NextImage(VisibleInWindow);
 103           return;
 104         }
 105         if (KeyPress == "f" || KeyPress == "F") {
 106           FlyToPosition(isi->GetInteractor(),this->SM->GetSlicer(VisibleInWindow));
 107           return;
 108         }
 109         if (KeyPress == "w") {
 110           this->SM->SetLocalColorWindowing(VisibleInWindow);
 111           return;
 112         }
 113         if (KeyPress == "0") {
 114           this->SM->SetPreset(0);
 115           this->SM->UpdateWindowLevel();
 116           return;
 117         }
 118         if (KeyPress == "1") {
 119           this->SM->SetPreset(1);
 120           this->SM->UpdateWindowLevel();
 121           return;
 122         }
 123         if (KeyPress == "2") {
 124           this->SM->SetPreset(2);
 125           this->SM->UpdateWindowLevel();
 126
 127           return;
 128         }
 129         if (KeyPress == "3") {
 130           this->SM->SetPreset(3);
 131           this->SM->UpdateWindowLevel();
 132           return;
 133         }
 134         if (KeyPress == "4") {
 135           this->SM->SetPreset(4);
 136           this->SM->UpdateWindowLevel();
 137           return;
 138         }
 139         if (KeyPress == "5") {
 140           this->SM->SetPreset(5);
 141           this->SM->UpdateWindowLevel();
 142           return;
 143         }
 144         if (KeyPress == "6") {
 145           this->SM->SetColorMap(0);
 146           this->SM->UpdateWindowLevel();
 147           return;
 148         }
 149         if (KeyPress == "7") {
 150           this->SM->SetColorMap(1);
 151           this->SM->UpdateWindowLevel();
 152           return;
 153         }
 154         if (KeyPress == "8") {
 155           this->SM->SetColorMap(2);
 156           this->SM->UpdateWindowLevel();
 157           return;
 158         }
 159         if (KeyPress == "9") {
 160           this->SM->SetColorMap(3);
 161           this->SM->UpdateWindowLevel();
 162           return;
 163         }
 164         if (KeyPress == "equal") { //keycodes are in vtkWin32RenderWindowInteractor
 165           this->SM->SetPreset(7);
 166           //this->SM->SetColorMap(1);
 167           this->SM->UpdateWindowLevel();
 168           return;
 169         }
 170         if (KeyPress == "minus") {
 171           this->SM->SetColorWindow(-this->SM->GetColorWindow());
 172           this->SM->SetColorMap(-1);
 173           this->SM->UpdateWindowLevel();
 174           return;
 175         }
 176         if (KeyPress == "c") {
 177           this->SM->ToggleContourSuperposition();
 178           this->SM->Render();
 179           return;
 180         }
 181         if (KeyPress == "l") {
 182           this->SM->ToggleInterpolation();
 183           this->SM->Render();
 184           return;
 185         }
 186         if (KeyPress == "h") {
 187           this->SM->SetCursorVisibility(0);
 188           this->SM->Render();
 189           return;
 190         }
 191         if (KeyPress == "x") {
 192           for(int i=0; i<SM->GetNumberOfSlicers(); i++) {
 193             SM->RemoveActor("overlay",0);
 194             SM->SetColorMap(0);
 195             SM->Render();
 196           }
 197           return;
 198         }
 199         if (KeyPress == "u") {
 200           this->SM->Reload();
 201           this->SM->Render();
 202           return;
 203         }
 204         if (KeyPress == "r" || KeyPress=="R") {
 205           this->SM->GetSlicer(VisibleInWindow)->ResetCamera();
 206           this->SM->GetSlicer(VisibleInWindow)->Render();
 207           this->SM->UpdateLinkedNavigation( this->SM->GetSlicer(VisibleInWindow) );
 208           return;
 209         }
 210         if (KeyPress == "g") {
 211           double* cursorPos = this->SM->GetSlicer(VisibleInWindow)->GetCursorPosition();
 212           this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(
 213             cursorPos[0],cursorPos[1],cursorPos[2],cursorPos[3]);
 214           this->SM->UpdateViews(1,VisibleInWindow);
 215           this->SM->UpdateLinked(VisibleInWindow);
 216           return;
 217         }
 218         if (KeyPress == "F5") {
 219           this->SM->GetSlicer(VisibleInWindow)->FlipHorizontalView();
 220           this->SM->GetSlicer(VisibleInWindow)->Render();
 221           return;
 222         }
 223         if (KeyPress == "F6") {
 224           this->SM->GetSlicer(VisibleInWindow)->FlipVerticalView();
 225           this->SM->GetSlicer(VisibleInWindow)->Render();
 226           return;
 227         }
 228         if (KeyPress == "Up") {
 229           this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 230           this->SM->UpdateSlice(VisibleInWindow);
 231         }
 232         if (KeyPress == "Down") {
 233           this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 234           this->SM->UpdateSlice(VisibleInWindow);
 235         }
 236         if (KeyPress == "space") {
 237           newLandmark = true;
 238         }
 239         if (KeyPress == "Left")
 240           this->SM->SetPreviousTSlice(VisibleInWindow);
 241         if (KeyPress == "Right")
 242           this->SM->SetNextTSlice(VisibleInWindow);
 243
 244         if (KeyPress == "F2") {
 245           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Sagital\n<slice>");
 246           this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(0);
 247           this->SM->UpdateSliceRange(VisibleInWindow);
 248         }
 249         if (KeyPress == "F3") {
 250           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Coronal\n<slice>");
 251           this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(1);
 252           this->SM->UpdateSliceRange(VisibleInWindow);
 253         }
 254         if (KeyPress == "F4") {
 255           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Axial\n<slice>");
 256           this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(2);
 257           this->SM->UpdateSliceRange(VisibleInWindow);
 258         }
 259
 260       }
 261
 262       //All type of mouse events
 263       if (event == vtkCommand::LeaveEvent) {
 264         this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 265             -VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 266         this->SM->GetSlicer(VisibleInWindow)->Render();
 267         return;
 268       }
 269
 270       //DD(event);
 271       // Mouse release HERE
 272       if (event == vtkCommand::EndPickEvent) {
 273         //            DD(VisibleInWindow);
 274         if (VisibleInWindow > -1)
 275           this->SM->LeftButtonReleaseEvent(VisibleInWindow);
 276         return; // no return !!!! ???
 277       }
 278
 279       if (event == vtkCommand::StartWindowLevelEvent) {
 280         mStartSlicer = -1;
 281         this->InitialWindow = this->SM->GetColorWindow();
 282         this->InitialLevel = this->SM->GetColorLevel();
 283
 284         if (VisibleInWindow > -1) {
 285           mStartSlicer = VisibleInWindow;
 286         }
 287         return;
 288       }
 289
 290       if (event == vtkCommand::EndWindowLevelEvent) {
 291         mStartSlicer = -1;
 292       }
 293
 294       if (event == vtkCommand::EndInteractionEvent) {
 295         this->SM->Picked();
 296         this->SM->UpdateLinkedNavigation(this->SM->GetSlicer(VisibleInWindow),true);
 297         return;
 298       }
 299     }
 300     if (VisibleInWindow > -1) {
 301       this->SM->Activated();
 302       //if(!this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->GetVisibility())
 303       this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetVisibility(1);
 304
 305       if (event == vtkCommand::MouseWheelForwardEvent && !isi->GetInteractor()->GetControlKey()) {
 306         this->SM->Picked();
 307         this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 308         this->SM->UpdateSlice(VisibleInWindow);
 309       } else if (event == vtkCommand::MouseWheelForwardEvent && isi->GetInteractor()->GetControlKey()) {
 310         double factor = 2;
 311         this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 312         Execute(caller, vtkCommand::EndInteractionEvent, NULL);
 313       } else if (event == vtkCommand::MouseWheelBackwardEvent && !isi->GetInteractor()->GetControlKey()) {
 314         this->SM->Picked();
 315         this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 316         this->SM->UpdateSlice(VisibleInWindow);
 317       } else if (event == vtkCommand::MouseWheelBackwardEvent && isi->GetInteractor()->GetControlKey()) {
 318         double factor = -2;
 319         this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 320         Execute(caller, vtkCommand::EndInteractionEvent, NULL);
 321       }
 322       double xWorld=0;
 323       double yWorld=0;
 324       double zWorld=0;
 325
 326       //Move into World Coordinate
 327       renderer->DisplayToNormalizedDisplay(x,y);
 328       renderer->NormalizedDisplayToViewport(x,y);
 329       renderer->ViewportToNormalizedViewport(x,y);
 330       renderer->NormalizedViewportToView(x,y,z);
 331       renderer->ViewToWorld(x,y,z);
 332       switch (this->SM->GetSlicer(VisibleInWindow)->GetSliceOrientation()) {
 333       case vtkImageViewer2::SLICE_ORIENTATION_XY:
 334         xWorld = x;
 335         yWorld = y;
 336         zWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 337                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[2] +
 338                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[2];
 339         break;
 340
 341       case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 342         xWorld = x;
 343         yWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 344                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[1] +
 345                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[1];
 346         zWorld = z;
 347         break;
 348
 349       case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 350         xWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 351                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[0] +
 352                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[0];
 353         yWorld = y;
 354         zWorld = z;
 355         break;
 356       }
 357       this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(xWorld,yWorld,zWorld,
 358           this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 359       if (newLandmark) {
 360         this->SM->AddLandmark(xWorld,yWorld,zWorld,
 361                               this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 362         this->SM->GetSlicer(VisibleInWindow)->UpdateLandmarks();
 363         this->SM->Render();
 364       }
 365       if (event == vtkCommand::PickEvent || event == vtkCommand::StartPickEvent) {
 366         this->SM->Picked();
 367         this->SM->UpdateViews(1,VisibleInWindow);
 368         this->SM->UpdateLinked(VisibleInWindow);
 369         this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 370       } else {
 371         this->SM->GetSlicer(VisibleInWindow)->Render();
 372       }
 373       //this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 374       //-VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 375       //this->SM->GetSlicer(VisibleInWindow)->Render();
 376     }
 377
 378     if (event == vtkCommand::WindowLevelEvent && mStartSlicer > -1) {
 379       this->SM->GetSlicer(mStartSlicer)->GetAnnotation()->SetVisibility(1);
 380       // Adjust the window level here
 381       int *size = isi->GetInteractor()->GetRenderWindow()->GetSize();
 382       double window = this->InitialWindow;
 383       double level = this->InitialLevel;
 384       double range[2];
 385       this->SM->GetImage()->GetScalarRange(range);
 386
 387       // Compute normalized delta
 388       double dx = static_cast<double>(isi->GetWindowLevelCurrentPosition()[0] -
 389                                       isi->GetWindowLevelStartPosition()[0]) / size[0];
 390       double dy = static_cast<double>(isi->GetWindowLevelStartPosition()[1] -
 391                                       isi->GetWindowLevelCurrentPosition()[1]) / size[1];
 392       //Window is exponential in nature, use exponential to avoid falling into negative numbers
 393       dx = std::exp(1.0 * (dx*fabs(dx) + dx)) ; //Quadratic behavior for more reactive interface
 394       dy = 0.15 * (dy*fabs(dy) + dy) * (range[1]-range[0]);//Quadratic behavior for more reactive interface
 395
 396       this->SM->SetColorWindow(window*dx);
 397       this->SM->SetColorLevel(level-dy);
 398       this->SM->SetPreset(6);
 399       this->SM->UpdateWindowLevel();
 400       this->SM->Render();
 401       return;
 402     }
 403   }
 404 }
 405 //------------------------------------------------------------------------------
 406
 407
 408 //------------------------------------------------------------------------------
 409 void vvSlicerManagerCommand::Dolly(double factor, vtkRenderWindowInteractor *interactor)
 410 {
 411   int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 412   vtkRenderer* renderer;
 413   if (VisibleInWindow>-1)
 414     renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 415   else {
 416     return;
 417   }
 418
 419   double viewFocus[4],viewPoint[4],motionVector[3], focalDepth;
 420   double oldPos[3], newPos[3], distance[2];
 421   vtkCamera *camera = renderer->GetActiveCamera();
 422   camera->GetFocalPoint(viewFocus);
 423
 424   renderer->SetWorldPoint(viewFocus[0], viewFocus[0], viewFocus[0], 1.0);
 425   renderer->WorldToDisplay();
 426   renderer->GetDisplayPoint(viewFocus);
 427
 428   focalDepth = viewFocus[2];
 429
 430   oldPos[0] = renderer->GetCenter()[0];
 431   oldPos[1] = renderer->GetCenter()[1];
 432   oldPos[2] = focalDepth;
 433
 434   distance[0] = 1/factor*
 435                 (interactor->GetEventPosition()[0]-renderer->GetCenter()[0]);
 436   distance[1] = 1/factor*
 437                 (interactor->GetEventPosition()[1]-renderer->GetCenter()[1]);
 438
 439   newPos[0] = interactor->GetEventPosition()[0] - distance[0];
 440   newPos[1] = interactor->GetEventPosition()[1] - distance[1];
 441   newPos[2] = focalDepth;
 442
 443   renderer->DisplayToNormalizedDisplay(oldPos[0],oldPos[1]);
 444   renderer->NormalizedDisplayToViewport(oldPos[0],oldPos[1]);
 445   renderer->ViewportToNormalizedViewport(oldPos[0],oldPos[1]);
 446   renderer->NormalizedViewportToView(oldPos[0],oldPos[1],oldPos[2]);
 447   renderer->ViewToWorld(oldPos[0],oldPos[1],oldPos[2]);
 448
 449   renderer->DisplayToNormalizedDisplay(newPos[0],newPos[1]);
 450   renderer->NormalizedDisplayToViewport(newPos[0],newPos[1]);
 451   renderer->ViewportToNormalizedViewport(newPos[0],newPos[1]);
 452   renderer->NormalizedViewportToView(newPos[0],newPos[1],newPos[2]);
 453   renderer->ViewToWorld(newPos[0],newPos[1],newPos[2]);
 454
 455   motionVector[0] = newPos[0] - oldPos[0];
 456   motionVector[1] = newPos[1] - oldPos[1];
 457   motionVector[2] = newPos[2] - oldPos[2];
 458
 459   camera->GetFocalPoint(viewFocus);
 460   camera->GetPosition(viewPoint);
 461   camera->SetFocalPoint(motionVector[0] + viewFocus[0],
 462                         motionVector[1] + viewFocus[1],
 463                         motionVector[2] + viewFocus[2]);
 464
 465   camera->SetPosition(motionVector[0] + viewPoint[0],
 466                       motionVector[1] + viewPoint[1],
 467                       motionVector[2] + viewPoint[2]);
 468
 469   if (camera->GetParallelProjection()) {
 470     camera->SetParallelScale(camera->GetParallelScale() / factor);
 471   } else {
 472     camera->Dolly(factor);
 473   }
 474
 475   if (interactor->GetLightFollowCamera()) {
 476     renderer->UpdateLightsGeometryToFollowCamera();
 477   }
 478   renderer->ResetCameraClippingRange();
 479   //interactor->Render();
 480 }
 481 //------------------------------------------------------------------------------
 482
 483
 484 //------------------------------------------------------------------------------
 485 void vvSlicerManagerCommand::FlyToPosition(vtkRenderWindowInteractor *interactor,vvSlicer* slicer)
 486 {
 487   double flyFrom[3], flyTo[3];
 488   double d[3], focalPt[3], position[3], positionFrom[3];
 489   int i, j;
 490   int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 491   vtkRenderer* renderer=NULL;
 492   if (VisibleInWindow>-1)
 493     renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 494   else
 495     return;
 496
 497   interactor->GetPicker()->Pick(interactor->GetEventPosition()[0],
 498                                 interactor->GetEventPosition()[1], 0.0,
 499                                 renderer);
 500
 501   vtkAssemblyPath *path=NULL;
 502   vtkAbstractPropPicker *picker;
 503   if ( (picker=vtkAbstractPropPicker::SafeDownCast(interactor->GetPicker()))) {
 504     path = picker->GetPath();
 505   }
 506   if ( path != NULL ) {
 507     flyTo[0] = picker->GetPickPosition()[0];
 508     flyTo[1] = picker->GetPickPosition()[1];
 509     flyTo[2] = picker->GetPickPosition()[2];
 510     renderer->GetActiveCamera()->GetFocalPoint(flyFrom);
 511     renderer->GetActiveCamera()->GetPosition(positionFrom);
 512
 513     switch (slicer->GetSliceOrientation()) {
 514     case vtkImageViewer2::SLICE_ORIENTATION_XY:
 515       flyTo[2] = flyFrom[2];
 516       break;
 517
 518     case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 519       flyTo[1] = flyFrom[1];
 520       break;
 521
 522     case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 523       flyTo[0] = flyFrom[0];
 524       break;
 525     }
 526
 527
 528     for (i=0; i<3; i++) {
 529       d[i] = flyTo[i] - flyFrom[i];
 530     }
 531     double distance = vtkMath::Normalize(d);
 532     double delta = distance/15;
 533
 534     for (i=1; i<=15; i++) {
 535       for (j=0; j<3; j++) {
 536         focalPt[j] = flyFrom[j] + d[j]*i*delta;
 537         position[j] = positionFrom[j] + d[j]*i*delta;
 538       }
 539       renderer->GetActiveCamera()->SetFocalPoint(focalPt);
 540       renderer->GetActiveCamera()->SetPosition(position);
 541       renderer->GetActiveCamera()->Dolly(0.3/15 + 1.0);
 542       renderer->ResetCameraClippingRange();
 543       interactor->Render();
 544     }
 545   }
 546 }
 547 //------------------------------------------------------------------------------