3D Polygon
The 3D polygon tool is used to segment the point clouds.
Create a new 3D Polygon
Ensure the point cloud is visible
Select the "Polygon" tool by clicking on the ‘+’ icon in the Class List on the left
On hovering over the point cloud, the user is able to see a small gray circle along with the mouse pointer.
Begin the annotation by left-clicking around the object of interest. To exit annotation mode, press escape
Simultaneously, the annotation is being projected in the image(s)
The more the number of clicks, the more the vertices in the polygon
Right-click to end the polygon (Note: a right-click also adds a point)
Provide the instance and mandatory attributes and save
An annotation is created and visible on the Class List. A triangle is drawn beside the annotation to denote it is a polygon.
Note: The 3D Polygon tool has an infinite depth, it is recommended to annotate with this in mind
Select a 3D Polygon
There are several ways to select the annotation.
Use the mouse and click on the annotation
Select the annotation from the Class List
Change the Dimensions of a 3D Polygon
Select the annotation
Drag the vertex to make the annotation more precise
Hover near the edge of the polygon and a ‘+’ symbol appears. Click and a new vertex is added to that edge
Snapping a vertex to its adjacent vertex deletes a vertex from the polygon.
Add Segment to 3D Polygon
Select the annotation
On the bottom right corner of the main screen an Add/Subtract button appears
Expand the list and the first item on the list is the main segment that is already drawn called the Primary Segment
To add more points to the Primary segment, click on the Add button and draw another polygon on the point cloud
This new segment is referred to as Segment 1 with a green clickable dot. Clicking this dot changes the segment from addition to subtract points.
Note: After expanding the Add/Subtract button, user must collapse it before going back to other operations on the tool
Subtract Segment from 3D Polygon
Select the annotation
On the bottom right corner of the main screen an Add/Subtract button appears
Expand the list and the first item on the list is the main segment that is already drawn called the Primary Segment
To remove points from the Primary segment, click on the Subtract button and draw another polygon on the point cloud
This new segment is referred to as Segment 1 with a red clickable dot. Clicking this dot changes the segment from subtraction to addition points.
Note: After expanding the Add/Subtract button, user must collapse it before going back to other operations on the tool
Change the Category of a 3D Polygon
Select the annotation
Open the Annotation Details panel
Select the new classification
Save
Copy/Paste a 3D Polygon
Inter Frame
This copies and pastes the dimensions along with the annotation details in the next/previous frames
Select the annotation
Press the hotkeys CTRL+C
Move to the next/previous frame
Press the hotkeys CTRL+V
Remove a 3D Polygon
There are several ways to delete the 3D polygon. First, select the annotation you want to remove, then do any of the following
Press the hotkey (Del)
Contextual click the annotation and select Add/Delete annotation
Click the trash icon next to the object in the Class List on the left.
Trash Icon
Since there are multiple instances of the same annotation within the same frame and across the sequence, the user is prompted with the following 4 choices:
Current Frame x
Delete selected annotation
This deletes the annotation from the current frame and specific sensor i.e. the count for this is always 1
Delete all annotations of object (n)
This deletes the annotation from the current frame and all sensors. The number of annotations present on the frame is mentioned beside this option.
Entire Sequence
Delete selected annotation (n)
This deletes the annotation from the entire sequence on the specific sensor. The number of annotations present on that sensor is mentioned beside this option
Delete all annotations of object (n)
This deletes all the annotations from the entire sequence visible in all sensors. The number of annotations present in the sequence is counted and mentioned beside this option.
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