I want to make such an animation as in the video - I know that I need cosine, sine, etc. but my knowledge does not allow me to write it, because I don't know geometry well. Please help me to do this.

I believe you already know how to generate entities, so let's get down to business, the Mathematics behind it. To make a circle we're going to use the sine and cosine of an angle that will show us a position on the circle, then we're going to multiply both by the radius, since the default "radius" of sine and cosine is 1. As the amount of items can vary, I made a calculation that will correctly distribute them in the circle... Code: (I haven't programmed in pocketmine for a while, so I know the API works correctly, so please follow this code as a guide, not a solution...) Code: <?php use pocketmine\item\Item; use pocketmine\math\Vector3; const RADIUS = 3; protected $items = []; protected $center; protected $turns = 0; //Your constructor function public function __construct(array $items) { $thos->items = $items; $this->center = new Vector3(0,0,0); } //Your loop can be a ScheduleTask public function loop() { $pi = 2 * M_PI; $cicles = 1 / sizeof($items); foreach ( $items as $i => $item ) { $x = sin($pi * ($i * $cicles)) * RADIUS; $y = cos($pi* ($i * $cicles)) * RADIUS; // X, Y, Z (using only Y,Z) $item->teleport($this->center->add(0, $x, $y)); } $this->turns += $cicles; $this->items[] = array_shift($this->items); if ($this->turns >= 1) { //1 = 100% // 1 turn completed, you can stop here } }