message: add HDRI direction
diff: @@ -420,7 +420,8 @@ namespace ospray {
  std::make_pair("position", std::make_pair(lightPos, false)));
  }
  - if (type == "distant" || type == "spot" || type == "sunSky") {
  + if (type == "distant" || type == "spot" || type == "sunSky"
  + || type == "hdri") {
  auto lightDir = xfmVector(xfms.top(), vec3f(0, 0, -1));
  propMap.insert(
  std::make_pair("direction", std::make_pair(lightDir, false)));
  