diff --git a/engine/Vector.ts b/engine/Vector.ts
index 36bfb0a..c902940 100644
--- a/engine/Vector.ts
+++ b/engine/Vector.ts
@@ -14,14 +14,14 @@ export function copyVector(vector: Vector): Vector {
 	};
 }
 
-export function fromPolar(direction: number, magnitude: number): Vector {
+export function fromPolar(angle: number, magnitude: number): Vector {
 	return {
-		x: Math.cos(direction) * magnitude,
-		y: Math.sin(direction) * magnitude,
+		x: Math.cos(angle) * magnitude,
+		y: Math.sin(angle) * magnitude,
 	};
 }
 
-export function getDirection(vector: Vector): number {
+export function getAngle(vector: Vector): number {
 	return Math.atan2(vector.y, vector.x);
 }
 
diff --git a/engine/system/physics.ts b/engine/system/physics.ts
new file mode 100644
index 0000000..f65108e
--- /dev/null
+++ b/engine/system/physics.ts
@@ -0,0 +1,115 @@
+import type { Circle } from "#/engine/Circle.ts";
+import type { Polygon } from "#/engine/Polygon.ts";
+import type { Rect } from "#/engine/Rect.ts";
+import $ from "#/engine/Scene.ts";
+import { createVector, type Vector } from "#/engine/Vector.ts";
+
+export enum Shape {
+	Cirle,
+	Rect,
+	Polygon,
+}
+
+const CIRCLE = Shape.Cirle;
+const RECT = Shape.Rect;
+const POLYGON = Shape.Polygon;
+
+type ShapeType = Shape.Cirle | Shape.Rect | Shape.Polygon;
+
+type CollisionBuffer = {
+	size: number;
+	mask: number;
+	cursor: number;
+	pool: Array<Collision>;
+	slice: Array<Collision>;
+};
+
+function createCollisionBuffer(size: number): CollisionBuffer {
+	if ((size & (size - 1)) !== 0) {
+		throw new Error("size must be a power of two");
+	}
+
+	const pool: Array<Collision> = [];
+	for (let i = 0; i < size; i++) {
+		pool.push(createCollision());
+	}
+
+	return {
+		size,
+		mask: size - 1,
+		cursor: 0,
+		pool,
+		slice: [],
+	};
+}
+
+function bufferNext(buffer: CollisionBuffer): Collision {
+	return buffer.pool[buffer.cursor++ & buffer.mask];
+}
+
+function bufferSliceReset(buffer: CollisionBuffer): void {
+	buffer.slice.length = 0;
+}
+
+function bufferSliceAdd(buffer: CollisionBuffer): Collision {
+	const next = bufferNext(buffer);
+	buffer.slice.push(next);
+
+	return next;
+}
+
+export type Collider = {
+	shape: ShapeType;
+	body: Circle | Rect | Polygon;
+	buffer: CollisionBuffer;
+};
+
+export type Collision = {
+	cid: string;
+	normal: Vector;
+	position: Vector;
+	depth: 0;
+	angle: 0;
+};
+
+function createCollision(): Collision {
+	return {
+		cid: "",
+		normal: createVector(),
+		position: createVector(),
+		depth: 0,
+		angle: 0,
+	};
+}
+
+export function createCollider(
+	shape: ShapeType,
+	body: Circle | Rect | Polygon,
+	bufferSize: number = 8,
+): Collider {
+	return {
+		shape,
+		body,
+		buffer: createCollisionBuffer(bufferSize),
+	};
+}
+
+export function moveAndCollide(
+	id: string,
+	velocity: Vector,
+	delta: number,
+): Array<Collision> {
+	const colliders = $<Collider>("collider")!;
+	const self = colliders.get(id)!.value;
+	bufferSliceReset(self.buffer);
+
+	for (const [cid, _] of colliders.entries()) {
+		if (cid === id) {
+			continue;
+		}
+		const collisoin = bufferSliceAdd(self.buffer);
+		collisoin.cid = cid;
+	}
+
+	return self.buffer.slice;
+}
diff --git a/engine/system/processPhysics.ts b/engine/system/processPhysics.ts
deleted file mode 100644
index f77ea1e..0000000
--- a/engine/system/processPhysics.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-import type { Circle } from "#/engine/Circle.ts";
-import type MapProxy from "#/engine/lib/MapProxy.ts";
-import RingBuffer from "#/engine/lib/RingBuffer.ts";
-import type { Polygon } from "#/engine/Polygon.ts";
-import type { Rect } from "#/engine/Rect.ts";
-import $ from "#/engine/Scene.ts";
-import { createVector, type Vector } from "#/engine/Vector.ts";
-
-const CIRCLE = 0;
-const RECT = 1;
-const POLYGON = 2;
-
-type Shape = 0 | 1 | 2;
-
-export type Collider = {
-	shape: Shape;
-	collision: Collision;
-};
-
-export type Collision = {
-	id: string;
-};
-
-export function createCollider(shape: Shape): Collider {
-	return {
-		shape,
-		collision: { id: "" },
-	};
-}
-
-const collisions = new RingBuffer(128, {
-	id: "",
-	normal: createVector(),
-});
-
-export function moveAndCollide(
-	id: string,
-	velocity: Vector,
-	delta: number,
-): void {
-	const colliders = $<Collider>("collider")!;
-
-	for (const [oid, _] of colliders.entries()) {
-		if (oid === id) {
-			continue;
-		}
-
-		const self = colliders.get(id)!.value;
-		self.collision.id = oid;
-	}
-}
diff --git a/game/entities/hero/entity.ts b/game/entities/hero/entity.ts
index 03aa6f0..78a8e4f 100644
--- a/game/entities/hero/entity.ts
+++ b/game/entities/hero/entity.ts
@@ -9,10 +9,10 @@ import {
 	defineSpriteSheet,
 } from "#/engine/Sprite.ts";
 import {
-	type Collider,
 	createCollider,
 	moveAndCollide,
-} from "#/engine/system/processPhysics.ts";
+	Shape,
+} from "#/engine/system/physics.ts";
 import { createVector, type Vector } from "#/engine/Vector.ts";
 import charIdle from "#/game/assets/char-idle.png";
 
@@ -24,13 +24,12 @@ const process = defineEntity("hero", {
 	sprite: createSprite(idleSrc),
 	animation: createSpriteAnimation(500, 2),
 	velocity: createVector(),
-	collider: createCollider(0),
+	collider: createCollider(Shape.Cirle, createCircle(createVector(), 8)),
 });
 
 process((id, delta) => {
 	const position = $<Vector>("position").get(id)!.value;
 	const velocity = $<Vector>("velocity").get(id)!.value;
-	const collider = $<Collider>("collider").get(id)!.value;
 
 	if (pointer.isDown) {
 		position.x = pointer.position.x;
@@ -48,6 +47,6 @@ process((id, delta) => {
 	velocity.x = 0;
 	velocity.y = 0;
 
-	moveAndCollide(id, velocity, delta);
-	console.log(collider.collision.id);
+	const collisions = moveAndCollide(id, velocity, delta);
+	console.log(collisions);
 });
diff --git a/game/entities/portal/entity.ts b/game/entities/portal/entity.ts
index 2524113..2c7b0f0 100644
--- a/game/entities/portal/entity.ts
+++ b/game/entities/portal/entity.ts
@@ -5,7 +5,7 @@ import {
 	createSpriteAnimation,
 	defineSpriteSheet,
 } from "#/engine/Sprite.ts";
-import { createCollider } from "#/engine/system/processPhysics.ts";
+import { createCollider, Shape } from "#/engine/system/physics.ts";
 import { createVector } from "#/engine/Vector.ts";
 import portal from "#/game/assets/portal.png";
 
@@ -15,5 +15,5 @@ defineEntity("portal", {
 	position: createVector(),
 	sprite: createSprite(portalSrc),
 	animation: createSpriteAnimation(400, 0),
-	collider: createCollider(0),
+	collider: createCollider(Shape.Cirle, createCircle(createVector(), 8)),
 });