collect generator voxel fragments to directory

src/content/ContentLoader.hpp

@@ -55,7 +55,7 @@ class ContentLoader {
 public:
     ContentLoader(ContentPack* pack, ContentBuilder& builder);
 
-    bool fixPackIndices(
+    static bool fixPackIndices(
         const fs::path& folder,
         dv::value& indicesRoot,
         const std::string& contentSection

src/content/loading/GeneratorLoader.cpp

@@ -22,7 +22,7 @@ static VoxelStructureMeta load_structure_meta(
 static std::vector<std::unique_ptr<GeneratingVoxelStructure>> load_structures(
     const fs::path& structuresFile
 ) {
-    auto structuresDir = structuresFile.parent_path();
+    auto structuresDir = structuresFile.parent_path() / fs::path("fragments");
     auto map = files::read_json(structuresFile);
 
     std::vector<std::unique_ptr<GeneratingVoxelStructure>> structures;