The script allows you to extract features using two methods: Manual and Automatic. Let's first take a look at the Manual Extraction method.

Basic Manual Workflow:

Step 1

Launch the script and choose:

• Sphere Radius - 0.3m

• Follow Trajectory option is OFF

For most projects, the default radius works very well.

Step 2

• Start clicking near the curb. You don't need to click exactly on the edge. Simply click approximately near the curb location.The script will analyze the surrounding geometry and calculate both curb lines automatically.

You'll immediately see:

• Top curb points 🔵

• Bottom curb points 🟠 

• Connected polylines

Step 3

• Continue placing points along the curb. As additional points are added, the curb lines grow automatically.

The workflow is very simple: just continue clicking points in the areas where extraction is required. This method is suitable for scenarios where there are many curb transitions within a small area, such as traffic islands, parking areas, and similar features.

Automatic Trajectory Following Workflow

The second method is Automatic Extraction, and it includes my favorite addition: Trajectory Mode. When enabled, the script learns the direction of the curb. After several successful detections it starts predicting where the next curb position should be located. Instead of requiring a new click for every point, the script can continue automatically.

Just activate the Follow Trajectory option in the main script menu, in the next window script will ask you how many curbs you would like to extract simultaneously, choose 1 for the first test and perform the same few clicks as we did before with the Manual Extraction method. You'll see how polylines will grow automatically.

This is especially useful for:

• Long roads

• Highway curbs

• Large infrastructure projects

For future projects, try extracting multiple curbs simultaneously. To do this, enter 2-3 in the Multiple Curbs dialog window. The curb selection workflow remains the same: first, select a set of points for the first curb, then select a set of points for the next curb. Once all curbs have been defined, the extraction process will start automatically.

Editing Tools

Now let's discuss another enhancement. Extraction is only half of the workflow. Editing is where most users spend their time. This version includes several tools specifically designed to reduce manual cleanup.

You have different options to switch to Edit Mode:

• While using the curb extraction mode, whether in Manual or Automatic mode, if the script cannot detect the next pair of points, it will ask you to define them manually. In this case, you can press the Esc key to cancel the extraction process and switch to Edit Mode.

• Another option is to select an existing line and then run the script. After the main menu appears, the script will automatically transfer you directly to Edit Mode.

Continue Existing Lines

You can select previously generated curb lines and launch the script again.

The script automatically:

• Loads the existing geometry

• Restores the editing state

• Allows additional extraction

• Allows further editing

This means you can stop working today and continue exactly where you left off tomorrow.

Cancel Last Point (Undo)

Mistakes happen. 

• The Undo option removes the last extracted point pair and rebuilds the curb lines automatically. No need to restart the extraction.

Connect to Previous Line

Curb segments are not always extracted in a single pass. The Connect function allows you to merge separate curb sections.

There are two methods available:

• Connect by Session

• Automatically connect to the previous curb segment.

Connect by Picking - Click near an existing curb line and the script finds the closest matching segment automatically. A transition point is generated and the lines are merged together.

Start New Line

Projects often contain multiple disconnected curb sections.

The Start New Line function creates a completely new curb session while preserving all previously extracted lines.

This keeps large projects organized and manageable.

Close Loop at Point

This feature is ideal for:

• Traffic islands

Simply click the closing location. The script creates a preview and allows confirmation before finalizing the loop. Both curb lines meet at the selected point and the extraction session is completed.

Edit Vertex

Sometimes a curb point is detected correctly except for one vertex. Instead of recreating the line, simply:

• Choose Edit Vertex.

• Select the line.

• Click near the vertex you want to modify.

• Pick a new location.

The line updates instantly. This makes local corrections very easy.

Create offset line

Creates an offset line from either the top or bottom curb line. This can be useful when the curb needs to be represented by three lines instead of two, or when creating an additional line for road markings located close to the curb.

• Select Create Offset Line.

• Choose which line should be offset: 🔵Top Line or 🟠Bottom Line

• Specify the offset distance.

• Click on either side of the selected line to define the direction of the offset.

The offset line will then be created at the specified distance on the selected side.

Finish – Closes the script and exits the current workflow.

Recommended Workflow

For most projects I recommend:

• Start with default settings.

• Extract several initial points manually.

• Enable trajectory following.

• Let the script continue automatically.

• Use Edit Vertex for small corrections.

• Use Manual 2 Points only where automation struggles.

• Connect segments when necessary.

• Close loops for islands and closed curb structures.

• Once the full line is completed, use the Offset option to generate additional lines based on it.

This workflow provides the best balance between speed and accuracy.

Advanced Extraction Settings

For most projects, the default settings should be all you need. The extraction workflow has been designed to work out of the box on the majority of curb and sidewalk datasets without requiring any parameter tuning.

However, every project is different. Point density, scanner type, curb geometry, noise levels, vegetation, parked vehicles, and surface conditions can all affect the extraction process. For these situations, you can switch to Advanced Extraction Settings.

Here you'll find a collection of parameters that allow you to fine-tune the extraction behavior by adjusting thresholds, tolerances, search distances, clustering parameters, slope analysis settings, and other advanced controls.

I'm not going to explain every parameter in this video because that would easily turn into a one-hour tutorial. The goal of this video is to show the workflow, not to dive into every technical detail.

If you'd like to learn more about a specific setting, there are two easy options:

• Simply hover your mouse over any parameter to read the built-in tooltip and quick explanation.

• Visit https://www.unsurveyed.xyz where you'll find additional documentation

For most users, I would recommend starting with the default settings and only moving to the advanced options when working with particularly challenging datasets or when you need to optimize the extraction for a specific type of curb geometry.

Final Thoughts

With this new version I tried transform the Curbstone Script from a simple extraction tool into a complete curb creation and editing environment inside Leica Cyclone 3DR.

With multiple extraction algorithms and advanced editing tools it reduces the effort required to generate accurate curb geometry from point clouds.

I hope this updated workflow saves you time and makes curb extraction much easier on your real-world projects.

If you find the script useful, don't forget to like the video, leave your feedback in the comments, and subscribe for more Leica Cyclone 3DR automation tutorials.

Thanks for watching, and see you in the next video. 🚀