Вы хотите использовать линейную интерполяцию.
Быстрый пример:
const POINTS = [ [ 526, 1573, 24 ], [ 2224, 809, -1546 ], [ 6869, 96, -3074 ] ];
const N = 10;
function getDistance(point1, point2) {
// speed in 3d space is mutated according only to the X distance,
// to keep speed constant in X dimension
return Math.abs(point1[0] - point2[0]);
}
function go(points, n) {
const pointDistances = points.slice(1).map((point, index) => getDistance(points[index], point));
const fullDistance = pointDistances.reduce((sum, distance) => sum + distance, 0);
const distancePerSection = fullDistance / n;
return points.slice(1)
.reduce((last, point, index) => {
const thisDistance = pointDistances[index];
const numRestPoints = Math.max(0, Math.floor(thisDistance / distancePerSection) - 1);
if (!numRestPoints) {
return last.concat([point]);
}
const thisYVector = point[1] - points[index][1];
const thisZVector = point[2] - points[index][2];
return last.concat(new Array(numRestPoints).fill(0)
.reduce((section, item, restIndex) => {
return section.concat([[
points[index][0] + (restIndex + 1) * distancePerSection,
points[index][1] + (restIndex + 1) * thisYVector * distancePerSection / thisDistance,
points[index][2] + (restIndex + 1) * thisZVector * distancePerSection / thisDistance
]]);
}, [])
.concat([point])
);
}, points.slice(0, 1));
}
function test() {
const result = go(POINTS, N);
if (result.length !== N) {
throw new Error('Must be N length');
}
if (!result[0].every((value, index) => value === POINTS[0][index])) {
throw new Error('Doesn\'t start at the first point');
}
if (!result[N - 1].every((value, index) => value === POINTS[POINTS.length - 1][index])) {
throw new Error('Doesn\'t end at the last point');
}
if (!POINTS.slice(1, N - 1).every(point =>
result.some(resultPoint => resultPoint.every((value, index) => value === point[index]))
)) {
throw new Error('Doesn\'t go through every provided point');
}
console.log(result.slice(1).map((point, index) => getDistance(point, result[index])));
console.log('The result passed the tests!');
console.log(JSON.stringify(result, null, 2));
}
test();
Я в основном прохожу список точек и определяю, должны ли существовать какие-либо точки отдыха междуих, вставляя их, если так.
Пожалуйста, прокомментируйте, если вы хотите получить дополнительные разъяснения!