message: respect "gridSpacing" tag in .osp files
diff: @@ -31,6 +31,7 @@ namespace ospray {
  "StructuredVolumeFromFile")->nodeAs<SVFF>();
  vec3i dimensions(-1);
  + vec3f gridSpacing = volume->child("gridSpacing").valueAs<vec3f>();
  std::string volumeFileName = "";
  std::string voxelType = "";
  @@ -43,6 +44,8 @@ namespace ospray {
  volumeFileName = child.content;
  else if (child.name == "samplingRate") {
  // Silently ignore
  + } else if (child.name == "gridSpacing") {
  + gridSpacing = toVec3f(child.content.c_str());
  } else {
  throw std::runtime_error("unknown old-style osp file "
  "component volume::" + child.name);
  @@ -54,6 +57,7 @@ namespace ospray {
  volume->child("dimensions") = dimensions;
  volume->child("voxelType") = voxelType;
  + volume->child("gridSpacing") = gridSpacing;
  world->add(volume);
  }
  