Polyline 3D

A Polyline 3D is a flexible annotation tool that allows users to draw a continuous line in 3D space with a starting point, an endpoint, and an unlimited number of joints or nodes in between. Each node marks a point in space where the line changes direction, enabling annotators to outline complex shapes or paths.

Use Case

This tool is ideal for tracing irregular or elongated objects such as roads, pipelines, or boundaries, where precise line-based annotation is needed. The polyline's flexibility ensures that even intricate curves and angles can be accurately represented in the 3D point cloud.

Polylines 3D can be created in point cloud.

Create Polyline

  1. Click on the '+' icon of the class from the class list

  2. Select 'Polyline' from the drawing tool list.

  3. The cursor pointer shows a grey circle marker to it while hovering over the points.

  4. Click to draw a polyline 3D on the desired object of interest. Move the mouse to the next desired location, and a line extending from the initial point will dynamically follow the cursor.

  5. The projection of the polyline is simultaneously reflected in the corresponding images of the image panel.

  6. Right-Click to indicate the end of the polyline.

    • Right-Click will introduce another point

  7. A status box appears, confirming the width (thickness) of the polyline. By default, it is set to 0 meters.

  8. Enter the annotation details.

  9. The saved instance will appear on the class list with a zig-zag line icon next to the Instance name.

Modify Polyline 3D

The polyline 3D can be re-selected and modified by:

  • Select a vertex that needs to be edited and drag it to modify its location.

  • Add a vertex by hovering over the edge of the polygon and left-click when the ‘+’ symbol appears.

  • Delete the vertex by dragging it into its immediate adjacent one OR press CTRL + Right-click

Learn how to use splitting, merging and extending polylines here.

Duplicate Polyline 3D

Polyline 3D can be duplicated by selecting the annotation and pressing Ctrl D. This will duplicate the cuboid and allow the user to drop it at the desired location in the point cloud on mouse-click.

Translate Polyline 3D

Reposition the entire 3D Polyline on any one axis or 3D plane

  1. Labeller to select the polyline

Translate on Z-axis

  1. Hold down the key Shift, a blue bar appears

  2. Click and drag the blue bar

Translate on Y-axis

  1. Hold the ALT, a green bar appears

  2. Click and drag the green bar

Translate on X- axis

  1. Hold down the CTRL, a red bar appears

  2. Click and drag the red bar

Translate in Any Direction

  1. Select the 3D polyline

  2. Press CTRL+M

  3. The polyline snaps to the mouse, and on moving the mouse, the polyline too will move.

Copy Paste Polyline

Polyline can be copy and pasted to another frame where it does not exist (Ctrl+C / Ctrl+V). The annotation detail input prompts user for input on pasting annotation. By default, the pasted Polyline will share the same Instance ID as the one of the copied Polyline 3D.

Copy and pasting of Polyline 3D works inter-frame (across frames where the same instance ID doesn't exist).

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