message: Rename chamberConstant to focalLength
diff: @@ -423,8 +423,7 @@ namespace ospray {
  if (ext.Has("lens")) {
  auto lens = ext.Get("lens");
  - float chamberConstant =
  - (float)lens.Get("chamberConstant").Get<double>();
  + float chamberConstant = (float)lens.Get("focalLength").Get<double>();
  float fovy = atan(len_y / (2 * chamberConstant)) * 360.f / (float)pi;
  sgCamera->child("fovy").setValue(fovy);
  