Function findSplitIndex

docs/app/js/sanddance-app.js:102518–102529

(positions, size, startIndex, endIndex)

    return parts;
}
function findSplitIndex(positions, size, startIndex, endIndex) {
    let maxLat = -1;
    let pointIndex = -1;
    for(let i = startIndex + 1; i < endIndex; i += size){
        const lat = Math.abs(positions[i]);
        if (lat > maxLat) {
            maxLat = lat;
            pointIndex = i - 1;
        }
    }
    return pointIndex;
}
function insertPoleVertices(positions, size, startIndex, endIndex, maxLatitude = DEFAULT_MAX_LATITUDE) {
    const firstLng = positions[startIndex];
    const lastLng = positions[endIndex - size];