2D Polygon

A 2D Polygon is an annotation tool used to draw a closed shape by connecting multiple points or vertices on a 2D plane, typically on an image. It allows you to outline irregular or complex objects with precision by placing a series of points around the object's boundary, making it ideal for objects that don't fit into simple rectangular boxes.

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Create 2D Polygon

1. Click the '+' icon next to the class you want to annotate from the class list.

2. Select 'Polygon2D' from the tool list.

3. The cursor pointer turns into a red circle marker while hovering over the image.

4. Click multiple times around the object of interest to define its boundary. Move your mouse to the next desired location, and a line extending from the initial point will dynamically follow the cursor.

   • Each Left-click adds a vertex to the polygon, allowing for a more precise shape.

5. Right-click to close and finalize the polygon.

6. Enter the annotation details.

7. The saved instance will appear in the class list with a 2D icon next to the instance name, indicating it was created in the image sensor.

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Lasso Mode

Lasso mode lets you draw a polygon boundary by moving your cursor rather than clicking for each vertex individually. This is especially useful for tracing objects with curved or irregular outlines - such as pedestrians, or vegetation - where click-by-click placement would be slow or imprecise.

Toggling lasso mode:

Press G while in polygon drawing mode to toggle lasso mode on. Press G again to toggle it off.

When lasso mode is active:

• Vertices are placed automatically along your cursor's path as it moves, producing a dense, smooth trace of the object's boundary.

• A visual indicator confirms the mode is active - the cursor style changes and the lasso tool is highlighted in the toolbar.

When lasso mode is toggled off:

• Vertex auto-placement pauses. The polygon remains open and in-progress.

• You can continue placing individual vertices by clicking, or Right-click to close and complete the polygon.

Recommended Tip: Lasso mode and standard click-to-place mode can be combined within the same annotation. For example, hold the cursor steady and press G to switch to click mode when you need a precise curve, then press G again to resume freehand tracing.

Lasso mode remains active until you manually toggle it off and works across all polygon types in the editor, including both 2D and 3D polygons.

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Modify 2D Polygon

To modify an existing polygon:

1. Move a vertex: Select a vertex and drag it to a new location.

2. Add a vertex: Hover over an edge of the polygon until a vertex symbol appears, then left-click to insert a new vertex.

3. Delete a vertex: Drag the vertex into an adjacent one to remove it.

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Copy and Paste 2D Polygon

2D Polygon annotations can be copied and pasted to another image sensor where they don't currently exist using Ctrl+C to copy and Ctrl+V to paste. When pasting, an annotation detail prompt will appear for you to enter information. By default, the pasted 2D Polygon will share the same Instance ID as the original copied polygon.