3D Polygon

A 3D Polygon is an annotation tool that allows users to draw a closed shape in 3D space by connecting multiple points or vertices. These points (3 or more) are joined together to form a polygonal surface, typically used to annotate complex, irregularly shaped objects or surfaces within a point cloud.

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Creating a 3D Polygon

1. Click the '+' icon next to your desired class in the class list.

2. Select '3D Polygon' from the drawing tool options.

3. Your cursor will display a grey circle marker when hovering over point cloud data.

4. Click multiple points around your object of interest to define its boundary. As you move your cursor, a line will dynamically extend from each point. Each click adds a vertex, allowing you to create a precise shape.

5. All points within the polygon boundary will be highlighted in the class color.

   Note: 3D polygons have infinite depth. We recommend using BEV and/or Hotzone to avoid capturing unintended points.

6. Right-click to complete and apply the polygon.

7. Enter the required annotation details in the prompt.

8. The saved annotation will appear in the class list with a triangle icon next to the instance name.

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Modifying a 3D Polygon

Select an existing polygon to modify it using these methods:

• Move vertices: Click and drag any vertex to reshape the polygon

• Add vertices: Hover over any edge and click the '+' symbol that appears

• Merge vertices: Click and drag a vertex onto an adjacent one to combine them

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Adding or Subtracting Segments

You can refine your polygon by adding or removing point clusters using additional segments.

Accessing the drawable:

1. Select your polygon to reveal the Add/Subtract panel in the bottom-right corner

2. Expand the panel to see the Primary Segment (your original polygon) listed first

Adding Segments

1. Click the 'Add' button

2. Draw a new polygon around points you want to include to the primary segment

3. Right-click to confirm

The new segment will:

• Display with a green boundary indicating addition

• Appear as Segment n (numbered sequentially) with a green clickable dot

Subtracting Segments

1. Click the 'Subtract' button

2. Draw a new polygon around points you want to exclude

3. Right-click to confirm

The new segment will:

• Display with a red boundary indicating subtraction

• Appear as Segment n (numbered sequentially) with a red clickable dot

Tip: Click any segment's colored dot to toggle between addition (green) and subtraction (red) states.

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Copy and Paste

Copy polygons to other frames using Ctrl+C (copy) and Ctrl+V (paste).

1. The annotation details prompt will appear when pasting

2. By default, the pasted polygon retains the same Instance ID as the original

3. This feature only works when pasting to frames where the annotation doesn't already exist