Fix absolute paths detection

src/vpc.cpp

@@ -306,7 +306,7 @@ void geometryToJson(const Geometry &geom, const BOX3D &bbox, nlohmann::json &jso
     }
 }
 
-bool VirtualPointCloud::write(std::string filename, bool forceAbsolutePaths)
+bool VirtualPointCloud::write(std::string filename)
 {
     if (!isVpcFilename(filename))
         filename += ".vpz";
@@ -319,6 +319,38 @@ bool VirtualPointCloud::write(std::string filename, bool forceAbsolutePaths)
 
     fs::path outputPath = fs::path(filenameAbsolute).parent_path();
 
+    bool forceAbsolutePaths = false;
+    for (const File &f : files) 
+    {
+      fs::path fRelative = fs::relative(f.filename, outputPath);
+      if (fRelative.empty()) {
+        forceAbsolutePaths = true;
+        std::cerr << "Warning: failed to make filename relative to output path: "
+                  << f.filename 
+                  << " ; using absolute paths in the output VPC file"
+                  << std::endl;
+        break;
+      }
+
+      for (size_t i = 0; i < f.overviewFilenames.size(); ++i)
+      {
+        std::string ovFilename(f.overviewFilenames[i]);
+        if (!pdal::Utils::isRemote(ovFilename)) 
+        {
+            const fs::path fRelative = fs::relative(ovFilename, outputPath);
+            if (fRelative.empty()) 
+            {
+                forceAbsolutePaths = true;
+                std::cerr << "Warning: failed to make overview filename relative to output path: "
+                        << ovFilename
+                        << " ; using absolute paths in the output VPC file"
+                        << std::endl;
+                break;
+            }
+        }
+      }
+    }
+
     std::vector<nlohmann::ordered_json> jFiles;
     for ( const File &f : files )
     {
@@ -580,7 +612,6 @@ void buildVpc(std::vector<std::string> args)
     int max_threads = -1;
     bool verbose = false;
     bool help = false;
-    bool forceAbsolutePaths = false;
 
     ProgramArgs programArgs;
     programArgs.add("help,h", "Output command help.", help);
@@ -596,7 +627,6 @@ void buildVpc(std::vector<std::string> args)
 
     pdal::Arg& argThreads = programArgs.add("threads", "Max number of concurrent threads for parallel runs", max_threads);
     programArgs.add("verbose", "Print extra debugging output", verbose);
-    programArgs.add("use-absolute-paths", "Store absolute file paths instead of relative paths in the output VPC", forceAbsolutePaths);
 
     try
     {
@@ -970,7 +1000,7 @@ void buildVpc(std::vector<std::string> args)
         }
     }
 
-    vpc.write(outputFile, forceAbsolutePaths);
+    vpc.write(outputFile);
 
     // TODO: for now hoping that all files have the same file type + CRS + point format + scaling
     // "dataformat_id"

src/vpc.hpp

@@ -78,7 +78,7 @@ struct VirtualPointCloud
     void clear();
     void dump();
     bool read(std::string filename);
-    bool write(std::string filename, bool forceAbsolutePaths = false);
+    bool write(std::string filename);
 
     point_count_t totalPoints() const;
     BOX3D box3d() const;

tests/test_clip.py

@@ -51,7 +51,7 @@ def test_input_file_output_file(
         (utils.test_data_filepath("data_copc.vpc"), utils.test_data_filepath("clipped-vpc-copc-files.copc.laz"), 66911),
         (utils.test_data_filepath("data_copc.vpz"), utils.test_data_filepath("clipped-vpz-copc-files.vpc"), 66911),
         (utils.test_data_filepath("data_copc.vpz"), utils.test_data_filepath("clipped-vpz-copc-files.copc.laz"), 66911),
-        ("https://raw.githubusercontent.com/PDAL/wrench/f4b156c5081dd9a1d44fccfdb67f2c36e91e3566/tests/data/stadium.vpc", utils.test_data_filepath("clipped-vpz-copc-files.copc.laz"), 66905),
+        ("https://raw.githubusercontent.com/PDAL/wrench/refs/heads/main/tests/data/stadium.vpc", utils.test_data_filepath("clipped-vpz-copc-files.copc.laz"), 66905),
     ],
 )
 def test_clip_vpc(

tests/test_vpc.py

@@ -7,34 +7,6 @@
 import utils
 
 
-def test_build_vpc_absolute_paths(laz_files):
-    """Paths stored in VPC use absolute paths when --use-absolute-paths is passed."""
-    with tempfile.TemporaryDirectory() as tmp_dir:
-        output_vpc = Path(tmp_dir) / "out.vpc"
-
-        res = subprocess.run(
-            [
-                utils.pdal_wrench_path(),
-                "build_vpc",
-                "--use-absolute-paths",
-                f"--output={output_vpc.as_posix()}",
-                *laz_files,
-            ],
-            check=True,
-        )
-
-        assert res.returncode == 0
-        assert output_vpc.exists()
-
-        data = json.loads(output_vpc.read_text())
-        assert data["type"] == "FeatureCollection"
-
-        for feature in data["features"]:
-            for asset in feature["assets"].values():
-                href = asset["href"]
-                assert Path(href).is_absolute(), f"Expected absolute path, got: {href}"
-
-
 def test_build_vpc_relative_paths_default(laz_files):
     """Paths stored in VPC are relative by default (no --absolute-paths)."""
     with tempfile.TemporaryDirectory() as tmp_dir: