text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    TestGPURayCastVolumeUpdate.cxx
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  
  =========================================================================*/
  // This test volume tests whether updating the volume MTime updates the ,
  // geometry in the volume mapper.
  
  #include <vtkColorTransferFunction.h>
  #include <vtkDataArray.h>
  #include <vtkGPUVolumeRayCastMapper.h>
  #include <vtkImageData.h>
  #include <vtkInteractorStyleTrackballCamera.h>
  #include <vtkNew.h>
  #include <vtkOSPRayPass.h>
  #include <vtkOutlineFilter.h>
  #include <vtkPiecewiseFunction.h>
  #include <vtkPolyDataMapper.h>
  #include <vtkRenderer.h>
  #include <vtkRenderWindow.h>
  #include <vtkRenderWindowInteractor.h>
  #include <vtkRTAnalyticSource.h>
  #include <vtkSmartPointer.h>
  #include <vtkTesting.h>
  #include <vtkTestUtilities.h>
  #include <vtkVolumeProperty.h>
  #include <vtkXMLImageDataReader.h>
  
  static const char * TestGPURayCastVolumeUpdateLog =
  "# StreamVersion 1\n"
  "EnterEvent 396 237 0 0 0 0 0\n"
  "MouseMoveEvent 396 237 0 0 0 0 0\n"
  "MouseMoveEvent 342 244 0 0 0 0 0\n"
  "MouseMoveEvent 301 244 0 0 0 0 0\n"
  "MouseMoveEvent 246 247 0 0 0 0 0\n"
  "MouseMoveEvent 232 251 0 0 0 0 0\n"
  "MouseMoveEvent 223 255 0 0 0 0 0\n"
  "LeftButtonPressEvent 223 255 0 0 0 0 0\n"
  "StartInteractionEvent 223 255 0 0 0 0 0\n"
  "TimerEvent 223 255 0 0 0 0 0\n"
  "RenderEvent 223 255 0 0 0 0 0\n"
  "TimerEvent 229 240 0 0 0 0 0\n"
  "RenderEvent 229 240 0 0 0 0 0\n"
  "MouseMoveEvent 232 233 0 0 0 0 0\n"
  "MouseMoveEvent 232 231 0 0 0 0 0\n"
  "TimerEvent 246 176 0 0 0 0 0\n"
  "RenderEvent 246 176 0 0 0 0 0\n"
  "MouseMoveEvent 247 172 0 0 0 0 0\n"
  "MouseMoveEvent 247 171 0 0 0 0 0\n"
  "TimerEvent 249 150 0 0 0 0 0\n"
  "RenderEvent 249 150 0 0 0 0 0\n"
  "MouseMoveEvent 249 147 0 0 0 0 0\n"
  "TimerEvent 249 144 0 0 0 0 0\n"
  "RenderEvent 249 144 0 0 0 0 0\n"
  "MouseMoveEvent 249 143 0 0 0 0 0\n"
  "TimerEvent 249 142 0 0 0 0 0\n"
  "RenderEvent 249 142 0 0 0 0 0\n"
  "TimerEvent 249 142 0 0 0 0 0\n"
  "RenderEvent 249 142 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 249 142 0 0 0 0 0\n"
  "EndInteractionEvent 249 142 0 0 0 0 0\n"
  "RenderEvent 249 142 0 0 0 0 0\n"
  "MouseMoveEvent 248 141 0 0 0 0 0\n"
  "MouseMoveEvent 246 139 0 0 0 0 0\n"
  "MouseMoveEvent 245 138 0 0 0 0 0\n"
  "LeftButtonPressEvent 245 138 0 0 0 0 0\n"
  "StartInteractionEvent 245 138 0 0 0 0 0\n"
  "TimerEvent 245 138 0 0 0 0 0\n"
  "RenderEvent 245 138 0 0 0 0 0\n"
  "MouseMoveEvent 244 138 0 0 0 0 0\n"
  "MouseMoveEvent 243 138 0 0 0 0 0\n"
  "TimerEvent 211 125 0 0 0 0 0\n"
  "RenderEvent 211 125 0 0 0 0 0\n"
  "MouseMoveEvent 210 124 0 0 0 0 0\n"
  "TimerEvent 198 115 0 0 0 0 0\n"
  "RenderEvent 198 115 0 0 0 0 0\n"
  "MouseMoveEvent 198 113 0 0 0 0 0\n"
  "MouseMoveEvent 198 112 0 0 0 0 0\n"
  "TimerEvent 197 101 0 0 0 0 0\n"
  "RenderEvent 197 101 0 0 0 0 0\n"
  "MouseMoveEvent 197 99 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 197 100 0 0 0 0 0\n"
  "EndInteractionEvent 197 100 0 0 0 0 0\n"
  "RenderEvent 197 100 0 0 0 0 0\n"
  "MouseMoveEvent 197 96 0 0 0 0 0\n"
  "MouseMoveEvent 197 92 0 0 0 0 0\n"
  "MouseMoveEvent 197 91 0 0 0 0 0\n"
  "MouseMoveEvent 197 90 0 0 0 0 0\n"
  "MouseMoveEvent 198 89 0 0 0 0 0\n"
  "MouseMoveEvent 198 88 0 0 0 0 0\n"
  "LeftButtonPressEvent 198 88 0 0 0 0 0\n"
  "StartInteractionEvent 198 88 0 0 0 0 0\n"
  "MouseMoveEvent 199 87 0 0 0 0 0\n"
  "TimerEvent 199 87 0 0 0 0 0\n"
  "RenderEvent 199 87 0 0 0 0 0\n"
  "MouseMoveEvent 199 86 0 0 0 0 0\n"
  "TimerEvent 200 77 0 0 0 0 0\n"
  "RenderEvent 200 77 0 0 0 0 0\n"
  "MouseMoveEvent 200 76 0 0 0 0 0\n"
  "MouseMoveEvent 200 75 0 0 0 0 0\n"
  "MouseMoveEvent 200 74 0 0 0 0 0\n"
  "TimerEvent 200 67 0 0 0 0 0\n"
  "RenderEvent 200 67 0 0 0 0 0\n"
  "TimerEvent 200 67 0 0 0 0 0\n"
  "RenderEvent 200 67 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 200 67 0 0 0 0 0\n"
  "EndInteractionEvent 200 67 0 0 0 0 0\n"
  "RenderEvent 200 67 0 0 0 0 0\n"
  "MouseMoveEvent 201 66 0 0 0 0 0\n"
  "MouseMoveEvent 206 71 0 0 0 0 0\n"
  "MouseMoveEvent 213 92 0 0 0 0 0\n"
  "MouseMoveEvent 216 112 0 0 0 0 0\n"
  "MouseMoveEvent 218 122 0 0 0 0 0\n"
  "MouseMoveEvent 222 131 0 0 0 0 0\n"
  "LeftButtonPressEvent 222 131 0 0 0 0 0\n"
  "StartInteractionEvent 222 131 0 0 0 0 0\n"
  "TimerEvent 222 131 0 0 0 0 0\n"
  "RenderEvent 222 131 0 0 0 0 0\n"
  "MouseMoveEvent 224 132 0 0 0 0 0\n"
  "TimerEvent 230 145 0 0 0 0 0\n"
  "RenderEvent 230 145 0 0 0 0 0\n"
  "MouseMoveEvent 233 151 0 0 0 0 0\n"
  "MouseMoveEvent 233 152 0 0 0 0 0\n"
  "TimerEvent 245 177 0 0 0 0 0\n"
  "RenderEvent 245 177 0 0 0 0 0\n"
  "MouseMoveEvent 247 183 0 0 0 0 0\n"
  "MouseMoveEvent 247 185 0 0 0 0 0\n"
  "TimerEvent 216 247 0 0 0 0 0\n"
  "RenderEvent 216 247 0 0 0 0 0\n"
  "MouseMoveEvent 212 251 0 0 0 0 0\n"
  "TimerEvent 208 234 0 0 0 0 0\n"
  "RenderEvent 208 234 0 0 0 0 0\n"
  "MouseMoveEvent 210 229 0 0 0 0 0\n"
  "MouseMoveEvent 210 227 0 0 0 0 0\n"
  "TimerEvent 218 202 0 0 0 0 0\n"
  "RenderEvent 218 202 0 0 0 0 0\n"
  "MouseMoveEvent 220 198 0 0 0 0 0\n"
  "MouseMoveEvent 221 196 0 0 0 0 0\n"
  "TimerEvent 226 183 0 0 0 0 0\n"
  "RenderEvent 226 183 0 0 0 0 0\n"
  "MouseMoveEvent 228 179 0 0 0 0 0\n"
  "MouseMoveEvent 229 178 0 0 0 0 0\n"
  "MouseMoveEvent 229 177 0 0 0 0 0\n"
  "TimerEvent 229 177 0 0 0 0 0\n"
  "RenderEvent 229 177 0 0 0 0 0\n"
  "MouseMoveEvent 230 175 0 0 0 0 0\n"
  "MouseMoveEvent 230 174 0 0 0 0 0\n"
  "TimerEvent 226 152 0 0 0 0 0\n"
  "RenderEvent 226 152 0 0 0 0 0\n"
  "MouseMoveEvent 225 151 0 0 0 0 0\n"
  "TimerEvent 225 151 0 0 0 0 0\n"
  "RenderEvent 225 151 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 225 151 0 0 0 0 0\n"
  "EndInteractionEvent 225 151 0 0 0 0 0\n"
  "RenderEvent 225 151 0 0 0 0 0\n"
  "MouseMoveEvent 224 151 0 0 0 0 0\n"
  "MouseMoveEvent 217 151 0 0 0 0 0\n"
  "MouseMoveEvent 215 151 0 0 0 0 0\n"
  "MouseMoveEvent 214 151 0 0 0 0 0\n"
  "LeftButtonPressEvent 214 151 0 0 0 0 0\n"
  "StartInteractionEvent 214 151 0 0 0 0 0\n"
  "TimerEvent 214 151 0 0 0 0 0\n"
  "RenderEvent 214 151 0 0 0 0 0\n"
  "MouseMoveEvent 206 146 0 0 0 0 0\n"
  "TimerEvent 206 146 0 0 0 0 0\n"
  "RenderEvent 206 146 0 0 0 0 0\n"
  "MouseMoveEvent 199 143 0 0 0 0 0\n"
  "MouseMoveEvent 198 143 0 0 0 0 0\n"
  "TimerEvent 185 135 0 0 0 0 0\n"
  "RenderEvent 185 135 0 0 0 0 0\n"
  "MouseMoveEvent 184 135 0 0 0 0 0\n"
  "TimerEvent 180 136 0 0 0 0 0\n"
  "RenderEvent 180 136 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 180 136 0 0 0 0 0\n"
  "EndInteractionEvent 180 136 0 0 0 0 0\n"
  "RenderEvent 180 136 0 0 0 0 0\n"
  "MouseMoveEvent 179 138 0 0 0 0 0\n"
  "MouseMoveEvent 174 152 0 0 0 0 0\n"
  "MouseMoveEvent 171 162 0 0 0 0 0\n"
  "MouseMoveEvent 164 178 0 0 0 0 0\n"
  "MouseMoveEvent 161 182 0 0 0 0 0\n"
  "MouseMoveEvent 160 183 0 0 0 0 0\n"
  "MouseMoveEvent 159 184 0 0 0 0 0\n"
  "LeftButtonPressEvent 159 184 0 0 0 0 0\n"
  "StartInteractionEvent 159 184 0 0 0 0 0\n"
  "MouseMoveEvent 158 185 0 0 0 0 0\n"
  "TimerEvent 158 185 0 0 0 0 0\n"
  "RenderEvent 158 185 0 0 0 0 0\n"
  "MouseMoveEvent 150 192 0 0 0 0 0\n"
  "MouseMoveEvent 149 193 0 0 0 0 0\n"
  "MouseMoveEvent 147 195 0 0 0 0 0\n"
  "TimerEvent 132 213 0 0 0 0 0\n"
  "RenderEvent 132 213 0 0 0 0 0\n"
  "MouseMoveEvent 131 215 0 0 0 0 0\n"
  "TimerEvent 130 220 0 0 0 0 0\n"
  "RenderEvent 130 220 0 0 0 0 0\n"
  "MouseMoveEvent 130 221 0 0 0 0 0\n"
  "MouseMoveEvent 130 222 0 0 0 0 0\n"
  "TimerEvent 131 225 0 0 0 0 0\n"
  "RenderEvent 131 225 0 0 0 0 0\n"
  "MouseMoveEvent 132 226 0 0 0 0 0\n"
  "TimerEvent 144 233 0 0 0 0 0\n"
  "RenderEvent 144 233 0 0 0 0 0\n"
  "MouseMoveEvent 148 235 0 0 0 0 0\n"
  "TimerEvent 176 253 0 0 0 0 0\n"
  "RenderEvent 176 253 0 0 0 0 0\n"
  "MouseMoveEvent 176 257 0 0 0 0 0\n"
  "MouseMoveEvent 176 258 0 0 0 0 0\n"
  "TimerEvent 173 272 0 0 0 0 0\n"
  "RenderEvent 173 272 0 0 0 0 0\n"
  "MouseMoveEvent 173 275 0 0 0 0 0\n"
  "MouseMoveEvent 173 276 0 0 0 0 0\n"
  "MouseMoveEvent 173 277 0 0 0 0 0\n"
  "TimerEvent 174 294 0 0 0 0 0\n"
  "RenderEvent 174 294 0 0 0 0 0\n"
  "MouseMoveEvent 174 299 0 0 0 0 0\n"
  "MouseMoveEvent 174 300 0 0 0 0 0\n"
  "TimerEvent 156 323 0 0 0 0 0\n"
  "RenderEvent 156 323 0 0 0 0 0\n"
  "MouseMoveEvent 150 323 0 0 0 0 0\n"
  "MouseMoveEvent 148 323 0 0 0 0 0\n"
  "TimerEvent 127 327 0 0 0 0 0\n"
  "RenderEvent 127 327 0 0 0 0 0\n"
  "MouseMoveEvent 126 329 0 0 0 0 0\n"
  "TimerEvent 126 330 0 0 0 0 0\n"
  "RenderEvent 126 330 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 126 330 0 0 0 0 0\n"
  "EndInteractionEvent 126 330 0 0 0 0 0\n"
  "RenderEvent 126 330 0 0 0 0 0\n"
  "MouseMoveEvent 128 328 0 0 0 0 0\n"
  "MouseMoveEvent 163 266 0 0 0 0 0\n"
  "MouseMoveEvent 172 244 0 0 0 0 0\n"
  "MouseMoveEvent 172 243 0 0 0 0 0\n"
  "MouseMoveEvent 173 242 0 0 0 0 0\n"
  "LeftButtonPressEvent 173 242 0 0 0 0 0\n"
  "StartInteractionEvent 173 242 0 0 0 0 0\n"
  "TimerEvent 173 242 0 0 0 0 0\n"
  "RenderEvent 173 242 0 0 0 0 0\n"
  "MouseMoveEvent 174 242 0 0 0 0 0\n"
  "MouseMoveEvent 175 242 0 0 0 0 0\n"
  "TimerEvent 182 263 0 0 0 0 0\n"
  "RenderEvent 182 263 0 0 0 0 0\n"
  "MouseMoveEvent 182 269 0 0 0 0 0\n"
  "MouseMoveEvent 182 270 0 0 0 0 0\n"
  "TimerEvent 182 270 0 0 0 0 0\n"
  "RenderEvent 182 270 0 0 0 0 0\n"
  "MouseMoveEvent 182 274 0 0 0 0 0\n"
  "TimerEvent 187 281 0 0 0 0 0\n"
  "RenderEvent 187 281 0 0 0 0 0\n"
  "MouseMoveEvent 192 284 0 0 0 0 0\n"
  "MouseMoveEvent 193 285 0 0 0 0 0\n"
  "MouseMoveEvent 195 286 0 0 0 0 0\n"
  "TimerEvent 201 288 0 0 0 0 0\n"
  "RenderEvent 201 288 0 0 0 0 0\n"
  "MouseMoveEvent 207 288 0 0 0 0 0\n"
  "MouseMoveEvent 208 288 0 0 0 0 0\n"
  "TimerEvent 226 288 0 0 0 0 0\n"
  "RenderEvent 226 288 0 0 0 0 0\n"
  "MouseMoveEvent 228 288 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 228 288 0 0 0 0 0\n"
  "EndInteractionEvent 228 288 0 0 0 0 0\n"
  "RenderEvent 228 288 0 0 0 0 0\n"
  "MouseMoveEvent 230 288 0 0 0 0 0\n"
  "MouseMoveEvent 229 287 0 0 0 0 0\n"
  "MouseMoveEvent 224 279 0 0 0 0 0\n"
  "MouseMoveEvent 221 278 0 0 0 0 0\n"
  "MouseMoveEvent 220 278 0 0 0 0 0\n"
  "MouseMoveEvent 219 278 0 0 0 0 0\n"
  "LeftButtonPressEvent 219 278 0 0 0 0 0\n"
  "StartInteractionEvent 219 278 0 0 0 0 0\n"
  "MouseMoveEvent 218 278 0 0 0 0 0\n"
  "TimerEvent 218 278 0 0 0 0 0\n"
  "RenderEvent 218 278 0 0 0 0 0\n"
  "MouseMoveEvent 213 278 0 0 0 0 0\n"
  "MouseMoveEvent 212 278 0 0 0 0 0\n"
  "TimerEvent 206 279 0 0 0 0 0\n"
  "RenderEvent 206 279 0 0 0 0 0\n"
  "MouseMoveEvent 196 281 0 0 0 0 0\n"
  "MouseMoveEvent 193 281 0 0 0 0 0\n"
  "TimerEvent 169 289 0 0 0 0 0\n"
  "RenderEvent 169 289 0 0 0 0 0\n"
  "MouseMoveEvent 159 294 0 0 0 0 0\n"
  "TimerEvent 151 297 0 0 0 0 0\n"
  "RenderEvent 151 297 0 0 0 0 0\n"
  "MouseMoveEvent 147 298 0 0 0 0 0\n"
  "TimerEvent 142 298 0 0 0 0 0\n"
  "RenderEvent 142 298 0 0 0 0 0\n"
  "MouseMoveEvent 141 299 0 0 0 0 0\n"
  "TimerEvent 141 299 0 0 0 0 0\n"
  "RenderEvent 141 299 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 141 299 0 0 0 0 0\n"
  "EndInteractionEvent 141 299 0 0 0 0 0\n"
  "RenderEvent 141 299 0 0 0 0 0\n"
  "MouseMoveEvent 141 298 0 0 0 0 0\n"
  "MouseMoveEvent 141 297 0 0 0 0 0\n"
  "MouseMoveEvent 141 296 0 0 0 0 0\n"
  "MouseMoveEvent 141 295 0 0 0 0 0\n"
  "MouseMoveEvent 142 293 0 0 0 0 0\n"
  "MouseMoveEvent 143 291 0 0 0 0 0\n"
  "MouseMoveEvent 152 275 0 0 0 0 0\n"
  "MouseMoveEvent 153 274 0 0 0 0 0\n"
  "MouseMoveEvent 167 266 0 0 0 0 0\n"
  "MouseMoveEvent 186 251 0 0 0 0 0\n"
  "MouseMoveEvent 190 246 0 0 0 0 0\n"
  "MouseMoveEvent 191 245 0 0 0 0 0\n"
  "LeftButtonPressEvent 191 245 0 0 0 0 0\n"
  "StartInteractionEvent 191 245 0 0 0 0 0\n"
  "TimerEvent 191 245 0 0 0 0 0\n"
  "RenderEvent 191 245 0 0 0 0 0\n"
  "MouseMoveEvent 191 247 0 0 0 0 0\n"
  "TimerEvent 192 248 0 0 0 0 0\n"
  "RenderEvent 192 248 0 0 0 0 0\n"
  "MouseMoveEvent 195 251 0 0 0 0 0\n"
  "TimerEvent 197 252 0 0 0 0 0\n"
  "RenderEvent 197 252 0 0 0 0 0\n"
  "TimerEvent 197 252 0 0 0 0 0\n"
  "RenderEvent 197 252 0 0 0 0 0\n"
  "MouseMoveEvent 201 252 0 0 0 0 0\n"
  "MouseMoveEvent 202 252 0 0 0 0 0\n"
  "MouseMoveEvent 203 252 0 0 0 0 0\n"
  "TimerEvent 214 251 0 0 0 0 0\n"
  "RenderEvent 214 251 0 0 0 0 0\n"
  "MouseMoveEvent 216 251 0 0 0 0 0\n"
  "TimerEvent 216 251 0 0 0 0 0\n"
  "RenderEvent 216 251 0 0 0 0 0\n"
  "MouseMoveEvent 218 250 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 218 250 0 0 0 0 0\n"
  "EndInteractionEvent 218 250 0 0 0 0 0\n"
  "RenderEvent 218 250 0 0 0 0 0\n"
  "MouseMoveEvent 219 250 0 0 0 0 0\n"
  "MouseMoveEvent 223 241 0 0 0 0 0\n"
  "MouseMoveEvent 220 230 0 0 0 0 0\n"
  "MouseMoveEvent 218 221 0 0 0 0 0\n"
  "MouseMoveEvent 218 220 0 0 0 0 0\n"
  "LeftButtonPressEvent 218 220 0 0 0 0 0\n"
  "StartInteractionEvent 218 220 0 0 0 0 0\n"
  "MouseMoveEvent 218 219 0 0 0 0 0\n"
  "TimerEvent 218 219 0 0 0 0 0\n"
  "RenderEvent 218 219 0 0 0 0 0\n"
  "MouseMoveEvent 218 210 0 0 0 0 0\n"
  "MouseMoveEvent 218 209 0 0 0 0 0\n"
  "TimerEvent 218 202 0 0 0 0 0\n"
  "RenderEvent 218 202 0 0 0 0 0\n"
  "MouseMoveEvent 219 199 0 0 0 0 0\n"
  "MouseMoveEvent 219 198 0 0 0 0 0\n"
  "TimerEvent 220 196 0 0 0 0 0\n"
  "RenderEvent 220 196 0 0 0 0 0\n"
  "MouseMoveEvent 220 194 0 0 0 0 0\n"
  "MouseMoveEvent 220 193 0 0 0 0 0\n"
  "MouseMoveEvent 220 192 0 0 0 0 0\n"
  "TimerEvent 221 190 0 0 0 0 0\n"
  "RenderEvent 221 190 0 0 0 0 0\n"
  "MouseMoveEvent 221 188 0 0 0 0 0\n"
  "TimerEvent 221 187 0 0 0 0 0\n"
  "RenderEvent 221 187 0 0 0 0 0\n"
  "MouseMoveEvent 221 185 0 0 0 0 0\n"
  "LeftButtonReleaseEvent 221 185 0 0 0 0 0\n"
  "EndInteractionEvent 221 185 0 0 0 0 0\n"
  "RenderEvent 221 185 0 0 0 0 0\n"
  "MouseMoveEvent 221 184 0 0 0 0 0\n"
  "MouseMoveEvent 220 182 0 0 0 0 0\n"
  "MouseMoveEvent 220 181 0 0 0 0 0\n"
  "MouseMoveEvent 219 180 0 0 0 0 0\n"
  "MouseMoveEvent 236 181 0 0 0 0 0\n"
  "MouseMoveEvent 249 188 0 0 0 0 0\n"
  "MouseMoveEvent 295 273 0 0 0 0 0\n"
  "MouseMoveEvent 300 364 0 0 0 0 0\n"
  "MouseMoveEvent 304 397 0 0 0 0 0\n"
  "MouseMoveEvent 305 399 0 0 0 0 0\n"
  ;
  
  int TestGPURayCastVolumeUpdate(int argc, char *argv[])
  {
    cout << "CTEST_FULL_OUTPUT (Avoid ctest truncation of output)" << endl;
    bool useOSP = true;
    for (int i = 0; i < argc; i++)
      {
      if (!strcmp(argv[i], "-GL"))
        {
        useOSP = false;
        }
      }
  
    double scalarRange[2];
  
    vtkNew<vtkActor> outlineActor;
    vtkNew<vtkPolyDataMapper> outlineMapper;
    vtkNew<vtkGPUVolumeRayCastMapper> volumeMapper;
  
    vtkNew<vtkXMLImageDataReader> reader;
    char* volumeFile = vtkTestUtilities::ExpandDataFileName(
                              argc, argv, "Data/vase_1comp.vti");
    reader->SetFileName(volumeFile);
    delete[] volumeFile;
  
    volumeMapper->SetInputConnection(reader->GetOutputPort());
  
    // Add outline filter
    vtkNew<vtkOutlineFilter> outlineFilter;
    outlineFilter->SetInputConnection(reader->GetOutputPort());
    outlineMapper->SetInputConnection(outlineFilter->GetOutputPort());
    outlineActor->SetMapper(outlineMapper.GetPointer());
  
    volumeMapper->GetInput()->GetScalarRange(scalarRange);
    volumeMapper->SetSampleDistance(0.1);
    volumeMapper->SetAutoAdjustSampleDistances(0);
    volumeMapper->SetBlendModeToComposite();
  
    vtkNew<vtkRenderWindow> renWin;
    renWin->SetMultiSamples(0);
    renWin->SetSize(400, 400);
  
    vtkNew<vtkRenderWindowInteractor> iren;
    iren->SetRenderWindow(renWin.GetPointer());
    vtkNew<vtkInteractorStyleTrackballCamera> style;
    iren->SetInteractorStyle(style.GetPointer());
  
    renWin->Render(); // make sure we have an OpenGL context.
  
    vtkNew<vtkRenderer> ren;
    ren->SetBackground(0.2, 0.2, 0.5);
    renWin->AddRenderer(ren.GetPointer());
  
    // Attach OSPRay render pass
    vtkNew<vtkOSPRayPass> osprayPass;
    if (useOSP)
      {
      ren->SetPass(osprayPass.GetPointer());
      }
  
    vtkNew<vtkPiecewiseFunction> scalarOpacity;
    scalarOpacity->AddPoint(50, 0.0);
    scalarOpacity->AddPoint(75, 1.0);
  
    vtkNew<vtkVolumeProperty> volumeProperty;
    volumeProperty->ShadeOn();
    volumeProperty->SetInterpolationType(VTK_LINEAR_INTERPOLATION);
    volumeProperty->SetScalarOpacity(scalarOpacity.GetPointer());
  
    vtkNew<vtkColorTransferFunction> colorTransferFunction;
    colorTransferFunction->RemoveAllPoints();
    colorTransferFunction->AddRGBPoint(scalarRange[0], 0.6, 0.4, 0.1);
    volumeProperty->SetColor(colorTransferFunction.GetPointer());
  
    vtkNew<vtkVolume> volume;
    volume->SetMapper(volumeMapper.GetPointer());
    volume->SetProperty(volumeProperty.GetPointer());
  
    /// Add sphere in the center of volume
    int dims[3];
    double spacing[3], center[3], origin[3];
    reader->Update();
    vtkSmartPointer<vtkImageData> im = reader->GetOutput();
    im->GetDimensions(dims);
    im->GetOrigin(origin);
    im->GetSpacing(spacing);
  
    center[0] = origin[0] + spacing[0]*dims[0]/2.0;
    center[1] = origin[1] + spacing[1]*dims[1]/2.0;
    center[2] = origin[2] + spacing[2]*dims[2]/2.0;
  
    ren->AddVolume(volume.GetPointer());
    ren->AddActor(outlineActor.GetPointer());
    ren->ResetCamera();
  
    int valid = volumeMapper->IsRenderSupported(renWin.GetPointer(),
                                                volumeProperty.GetPointer());
  
    int retVal;
    if (valid)
      {
      renWin->Render();
  
      vtkNew<vtkRTAnalyticSource> wavelet;
      wavelet->SetWholeExtent(-127, 128,
                              -127, 128,
                              -127, 128);
      wavelet->SetCenter(center);
      outlineFilter->SetInputConnection(wavelet->GetOutputPort());
      volumeMapper->SetInputConnection(wavelet->GetOutputPort());
      outlineFilter->UpdateWholeExtent();
      ren->ResetCamera();
  
      iren->Initialize();
      retVal = !( vtkTesting::InteractorEventLoop(argc, argv,
                                                  iren.GetPointer(),
                                                  TestGPURayCastVolumeUpdateLog));
      }
    else
      {
      retVal = vtkTesting::PASSED;
      cout << "Required extensions not supported" << endl;
      }
  
    return !retVal;
  }
  