Split, Merge and Extend 3D Polylines
The Split, Merge and Extend Polyline feature gives users fine-grained control over editing polylines—making it easy to break a line into segments, join two polylines together, or extending an existing line. This leads to more accurate annotations, faster editing, and leaner workflows by reducing the need for redraws and manual corrections. It’s especially valuable when working with long or branching path structures that evolve frame by frame.
Split, Merge, and Extend Polylines is an all-round feature that enables high-quality annotations, delivered quickly - ensuring the process is efficient.
Use Cases
Road or path segmentation in autonomous driving datasets where line breaks indicate intersections or stop zones.
Crop row or field boundary adjustments in agri-tech, especially when shapes change across time or due to occlusions.
Splitting or connecting wiring paths in industrial inspection or utility mapping annotations.
Benefits
Good: Increases annotation precision by letting users restructure lines without redrawing from scratch.
Fast: Saves time in editing by using quick gestures to split, merge, or extend existing work.
Cheap/Lean: Minimizes the need for repetitive actions and simplifies quality control by maintaining continuity of attributes during edits.
Steps to Use Split, Merge and Extend Polylines
Split Polyline
Select the polyline to split.
Hold Shift and hover over an edge.
A red blade icon appears when the tool is ready to split.
Right-click on the edge.
A confirmation prompt appears.
On confirming, you're prompted to enter class, instance, and attribute values for the new lines.
The tool retains selection on the split polyline for quick attribute entry.
Merge Polylines
Hover over the first or last vertex of a polyline.
Hold Alt—the edge visually latches to your cursor.
Release Alt; the latching remains active.
Hover over the vertex of the second polyline (start or end).
Press Alt again.
An 'M' icon appears, indicating the merge option.
Left-click to confirm merge.
A confirmation prompt appears.
Polylines are merged.
The resulting polyline inherits the class, instance ID, and attributes of the first line.
Extend Polyline
Hover over the first or last vertex of a polyline.
Hold Alt—the polyline end latches to your cursor.
Let go of Alt; extension mode remains active.
Left-click to place new vertices and continue drawing.
Tip: This feature works seamlessly with free and snapped vertex modes, allowing for precise control while extending.
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