icp-log-viewer: add --min-quality filter CLI flag

apps/icp-log-viewer/main.cpp

@@ -75,6 +75,12 @@ static TCLAP::ValueArg<double> argAutoPlayPeriod(
     "mode.",
     false, 0.1, "period [seconds]", cmd);
 
+static TCLAP::ValueArg<double> argMinQuality(
+    "q", "min-quality",
+    "Minimum ICP quality (range [0,1], i.e. 0%-100%) to load a log file. "
+    "Files whose ICP result quality is below this threshold are skipped.",
+    false, 0.0, "quality [0,1]", cmd);
+
 // =========== Declare global variables ===========
 #if MRPT_HAS_NANOGUI
 
@@ -233,6 +239,48 @@ void main_show_gui()
         files[0].wholePath = argSingleFile.getValue();
     }
 
+    // Apply minimum quality filter if requested:
+    if (argMinQuality.isSet())
+    {
+        const double minQ = argMinQuality.getValue();
+        if (minQ < 0.0 || minQ > 1.0)
+        {
+            THROW_EXCEPTION_FMT("--min-quality must be in [0,1]. Got: %.03f", minQ);
+        }
+        std::cout << "Applying minimum quality filter: q >= " << minQ << std::endl;
+
+        mrpt::system::CDirectoryExplorer::TFileInfoList filteredFiles;
+        for (const auto& file : files)
+        {
+            mp2p_icp::LogRecord lr;
+            if (!lr.load_from_file(file.wholePath))
+            {
+                std::cerr << "  Warning: could not load '" << file.wholePath << "'" << std::endl;
+                continue;
+            }
+            if (lr.icpResult.quality >= minQ)
+            {
+                filteredFiles.push_back(file);
+            }
+            else
+            {
+                std::cout << "  Skipping (quality=" << lr.icpResult.quality << " < " << minQ
+                          << "): " << file.name << std::endl;
+            }
+        }
+        std::cout << "Quality filter: kept " << filteredFiles.size() << " / " << files.size()
+                  << " files." << std::endl;
+
+        if (files.empty())
+        {
+            THROW_EXCEPTION_FMT(
+                "No log files passed --min-quality=%.03f. Lower the threshold or check input logs.",
+                minQ);
+        }
+
+        files = std::move(filteredFiles);
+    }
+
     // load files:
     for (const auto& file : files)
     {

docs/source/app_icp-log-viewer.rst

@@ -4,7 +4,8 @@
 Application: ``icp-log-viewer``
 =====================================
 
-Debug ICP pipelines as never before!
+``icp-log-viewer`` is an interactive GUI tool to inspect and debug ICP (Iterative Closest Point)
+registration sessions stored as ``*.icplog`` files.
 
 .. raw:: html
 
@@ -18,30 +19,48 @@ Debug ICP pipelines as never before!
 How to launch
 ------------------
 
-Once mp2p_icp is installed, move to the directory where your `*.icplog` files have been stored and run:
+Once mp2p_icp is installed, move to the directory where your ``*.icplog`` files have been stored and run:
 
 .. code-block:: bash
 
     icp-log-viewer
 
+You can also point it directly at a single file or a specific directory:
+
+.. code-block:: bash
+
+    # Load all *.icplog files in a directory
+    icp-log-viewer -d /path/to/logs/
+
+    # Load a single file
+    icp-log-viewer -f /path/to/log.icplog
+
+    # Only load files where the ICP quality is >= 0.5 (50%)
+    icp-log-viewer -d /path/to/logs/ --min-quality 0.5
+
 
 .. dropdown:: Complete command line argument help
 
     .. code-block:: bash
 
         USAGE:
 
-          icp-log-viewer  [--autoplay-period <period [seconds]>] [-l <foobar.so>]
-                          [-f <log.icplog>] [-d <.>] [-e <icplog>] [--]
-                          [--version] [-h]
+          icp-log-viewer  [--autoplay-period <period [seconds]>] [-q <quality [0,1]>]
+                          [-l <foobar.so>] [-f <log.icplog>] [-d <.>] [-e <icplog>]
+                          [--] [--version] [-h]
 
 
-        Where: 
+        Where:
 
           --autoplay-period <period [seconds]>
             The period (in seconds) between timestamps to load and show in
             autoplay mode.
 
+          -q <quality [0,1]>,  --min-quality <quality [0,1]>
+            Minimum ICP quality (range [0,1], i.e. 0%-100%) to load a log file.
+            Files whose ICP result quality is below this threshold are skipped.
+            This is useful to focus inspection on well-converged ICP results.
+
           -l <foobar.so>,  --load-plugins <foobar.so>
             One or more (comma separated) *.so files to load as plugins
 
@@ -52,7 +71,7 @@ Once mp2p_icp is installed, move to the directory where your `*.icplog` files ha
             Directory in which to search for *.icplog files.
 
           -e <icplog>,  --file-extension <icplog>
-            Filename extension to look for. Default is `icplog`
+            Filename extension to look for. Default is ``icplog``.
 
           --,  --ignore_rest
             Ignores the rest of the labeled arguments following this flag.
@@ -67,4 +86,49 @@ Once mp2p_icp is installed, move to the directory where your `*.icplog` files ha
 GUI and feature explanation
 -------------------------------
 
-Write me!
+The viewer window is divided into a left control panel and a main 3D viewport.
+
+**Log selector**
+
+A slider at the top of the panel lets you step through all loaded ``*.icplog`` entries
+(filtered by ``--min-quality`` if requested at launch).  Use the **Back** / **Forward** buttons
+for single-step navigation, or enable **Autoplay** to advance automatically at the rate set by
+``--autoplay-period``.
+
+**3D viewport**
+
+The main 3D view shows the *global* map and the *local* point cloud registered against it.
+The initial-guess pose and the final ICP pose can be toggled independently.
+
+**ICP statistics panel**
+
+Numerical outputs shown for each selected log entry:
+
+- **Quality** — the ICP quality score in [0, 1] produced by the configured
+  ``QualityEvaluator`` (e.g. ``QualityEvaluator_PairedRatio``).
+- **Log pose** — the final estimated SE(3) pose of the local map.
+- **Initial guess** — the pose used to seed the ICP iteration.
+- **Init→Final** — the correction applied by ICP on top of the initial guess.
+- **Covariance / condition number** — uncertainty of the result.
+- **Pairings** — number of point correspondences in the last ICP iteration.
+
+**Pairings visualisation**
+
+Enable **Show pairings** to draw the point correspondences found at the last ICP
+iteration.  Individual pairing types (point-to-point, point-to-plane, point-to-line,
+covariance-to-covariance) can be toggled independently.
+
+**Filtering by quality at load time**
+
+When a directory contains many log files (e.g. from a full SLAM session) it is often
+useful to inspect only the low-quality registrations that may have caused drift.  Use
+``--min-quality`` to restrict the loaded set:
+
+.. code-block:: bash
+
+    # Inspect only high-quality (≥ 80 %) registrations
+    icp-log-viewer -d logs/ --min-quality 0.8
+
+    # Inspect only low-quality (< 20 %) registrations — invert by running with 0
+    # and then sorting/filtering externally, or set a low threshold and browse manually
+    icp-log-viewer -d logs/ --min-quality 0.0