The Freeform Tool provides a high-speed alternative to the standard Polygon Tool, allowing users to trace complex shapes with a continuous fluid motion rather than manual vertex placement.
Drawing Process: Unlike the click-by-click method of the Polygon Tool, the Freeform Tool allows users to draw shapes freely as if using a pen.
Auto-Conversion: Once the stroke is completed, the platform utilizes a path simplification algorithm to automatically convert the freehand drawing into a structured Polygon. This ensures that the final annotation remains editable and compatible with standard segmentation formats.
Finalizing: Releasing the mouse button or closing the loop automatically triggers the conversion process.
The Freeform Tool shares the same operational flexibility as the Polygon Tool. Through the Interactive Toolbar, users can select from four distinct modes:
Overwrite: The new shape is drawn independently.
Subtract: The freehand stroke cuts out a section from an existing polygon.
Auto Subtract: The platform automatically trims the freeform shape so it does not overlap with existing boundaries.
Union: The new freeform shape is merged into a single logical entity with an existing polygon.
The precision of the freeform-to-polygon conversion can be adjusted to match the complexity of the object:
Point Frequency: Users can control how many vertices are generated during the conversion. A higher density captures more detail, while a lower density creates a simpler, more manageable polygon.
Configuration: These settings are located under the Freeform Settings section within the Canvas Settings menu. Adjusting the frequency allows for a perfect balance between speed and geometric accuracy.
