message: VKL 0.8 adaptions
diff: @@ -62,7 +62,7 @@ vec4f DRR_integrateVolumeInterval(
  Volume *uniform volume = vm->volume;
  TransferFunction *uniform tf = vm->transferFunction;
  - uniform VKLIntervalIterator intervalIterator;
  + VKLIntervalIterator intervalIterator;
  vklInitIntervalIteratorV(&intervalIterator,
  volume->vklVolume,
  (varying vkl_vec3f *)&ray.org,
  