kotlin-cesium-engine/cesium.engine/GeoJsonPrimitive

GeoJsonPrimitive

open external class GeoJsonPrimitive(options: GeoJsonPrimitiveConstructorOptions? = definedExternally)(source)

Lightweight GeoJSON loader that converts features directly into BufferPointCollection, BufferPolylineCollection, and BufferPolygonCollection.

Unlike GeoJsonDataSource, this path does not create entities. Instead, it exposes high-throughput buffer primitive collections that can be added directly to Scene.primitives.

// Load GeoJSON
const loader = await GeoJsonPrimitive.fromUrl("./data.geojson");
viewer.scene.primitives.add(loader);

// Access GeoJSON features and properties
loader.points;     // BufferPointCollection | undefined
loader.polylines;  // BufferPolylineCollection | undefined
loader.polygons;   // BufferPolygonCollection | undefined
loader.ids;        // source feature IDs
loader.properties; // source feature properties

// Style GeoJSON
const material = new BufferPolylineMaterial({
  color: Color.RED,
  width: 4,
});

const polyline = new BufferPolyline();
const count = primitive.polylines.primitiveCount;
for (let i = 0; i < count; i++) {
  primitive.polylines.get(i, polyline);

  const properties = primitive.getProperties(polyline.featureId);
  if (properties.myCustomProperty === true) {
    polyline.setMaterial(material);
  }
}