Polygons

The polygon annotation renderer draws closed paths with at least three media-pixel points. BasePolygonStyle controls their fill, stroke, and visibility independently from boxes or masks on the same detection.

Add the polygon renderer

session.setPresentation({
  renderers: [
    annotationRenderers.polygon({
      style: new BasePolygonStyle({
        fill: { alpha: 0.16 },
        stroke: { width: 3 },
      }),
    }),
  ],
});
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The basketball fixture keeps its source masks beside deterministic, mask-derived polygons. That makes it possible to compare the two layers without recovering geometry from rendered pixels.

See Detections And Rendering for the complete detection geometry contract.