How to collect all possible coordinates present inside a polygon area

@Jacky, yes, it will work for any shape of polygon.

I’m not sure that it is possible to use a side library in the Cesium Sandcastle.
But you can use Turf playground to see how it works.

Example for Turf playground:

const map = L.map("map").setView([42.32481709325035, -72.37353086471558], 20);

L.tileLayer('https://stamen-tiles.a.ssl.fastly.net/toner-lite/{z}/{x}/{y}.png', {
  attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);


const polygon = turf.polygon([
      [
        [-72.37353086471558, 42.32481709325035],
        [-72.3738956451416, 42.324594989789134],
        [-72.3735523223877, 42.324436343979656],
        [-72.37387418746948, 42.32430942704402],
        [-72.37363815307616, 42.32405559240466],
        [-72.37391710281372, 42.32388108049599],
        [-72.37363815307616, 42.32367483852534],
        [-72.37352013587952, 42.32375416244021],
        [-72.37370252609253, 42.32385728338004],
        [-72.37343430519104, 42.32408732179058],
        [-72.37361669540404, 42.32429356240905],
        [-72.37331628799438, 42.324428411678674],
        [-72.373605966568, 42.3246108543481],
        [-72.37338066101074, 42.32473777067564],
        [-72.37353086471558, 42.32481709325035]
      ]
    ]);

L.geoJson(polygon).addTo(map);

// Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
// BBox - bbox extent in minX, minY, maxX, maxY order
// http://turfjs.org/docs/#bbox
const bbox = turf.bbox(polygon);
const cellSideMeter = 1.0;
const options = {
	units: 'meters',
  mask: polygon
};

// Creates a Point grid from a bounding box, FeatureCollection or Feature.
// FeatureCollection <Point> - grid of points
// http://turfjs.org/docs/#pointGrid
const pointGrid = turf.pointGrid(bbox, cellSideMeter, options);
const pointGridCoordinates = pointGrid.features.map(f => f.geometry.coordinates);

console.log(pointGridCoordinates);

After these calculations you may copy resulted pointGrid coordinates from a console to Cesium Sandcastle code, like here

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