Example:

import earcut from "earcut";

const collection = new BufferPolygonCollection({
  primitiveCountMax: 1024,
  vertexCountMax: 4096,
  holeCountMax: 1024,
  triangleCountMax: 2048,
});

const polygon = new BufferPolygon();
const positions = [ ... ];
const holes = [ ... ];

// Create a new polygon, temporarily bound to 'polygon' local variable.
collection.add({
  positions: new Float64Array(positions),
  holes: new Uint32Array(holes),
  triangles: new Uint32Array(earcut(positions, holes, 3)),
  color: Color.WHITE,
}, polygon);

// Iterate over all polygons in collection, temporarily binding 'polygon'
// local variable to each, and updating polygon color.
for (let i = 0; i < collection.primitiveCount; i++) {
  collection.get(i, polygon);
  polygon.setColor(Color.RED);
}

See:

• BufferPolygon
• BufferPrimitiveCollection