diff --git a/main.go b/main.go
index 2604104..7bbb776 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,14 @@ import (
 	rl "github.com/gen2brain/raylib-go/raylib"
 )
 
+type magnet struct {
+    pos rl.Vector2
+    speed rl.Vector2
+    color rl.Color
+    mass float32
+    radius float32
+}
+
 
 type quadnode struct {
     // pos, size rl.Vector2
@@ -16,16 +24,49 @@ type quadnode struct {
     magnet *magnet
     parent *quadnode
     nodes []*quadnode
-    debug string
+    mass float32
 }
 
-func newQuadTree() *quadnode {
-    return &quadnode{
+
+func (q *quadnode) isOutside(magnet rl.Vector2) bool {
+    return magnet.X < q.pos.X || magnet.X >= q.pos.X + q.size.X ||
+    magnet.Y < q.pos.Y || magnet.Y >= q.pos.Y + q.size.Y
+}
+
+func (q *quadnode) isOccupied() (bool, *magnet) {
+    if q.magnet == nil {
+        return false, nil
+    } else {
+        return true, q.magnet
+    }
+}
+
+func (q *quadnode) insertMagnet(magnets ...*magnet) {
+    for _, magnet := range magnets {
+
+        for _, node := range q.nodes {
+            if node.isOutside(magnet.pos) {
+                continue
+            }
+            if occupied, occupyingMagnet := node.isOccupied(); occupied {
+                node.subdivide()
+                node.insertMagnet(occupyingMagnet)
+            }
+            node.insertMagnet(magnet)
+            node.magnet = magnet
+            break
+        }
+    }
+}
+
+func newQuadTreeRoot() *quadnode {
+    temp := &quadnode{
         pos: rl.NewVector2(0, 0),
         size: rl.NewVector2(windowWidth, windowHeight),
         nodes: nil,
-        debug: "root",
     }
+    temp.subdivide()
+    return temp
 }
 
 func (q *quadnode) subdivide() {
@@ -38,33 +79,27 @@ func (q *quadnode) subdivide() {
             pos: q.pos,
             size: halfSize,
             parent: q,
-            debug: "0",
+            magnet: nil,
         },
         {
             pos: rl.NewVector2(q.pos.X + halfX, q.pos.Y),
             size: halfSize,
             parent: q,
-            debug: "1",
+            magnet: nil,
         },
         {
             pos: rl.NewVector2(q.pos.X, q.pos.Y + halfY),
             size: halfSize,
             parent: q,
-            debug: "2",
+            magnet: nil,
         },
         {
             pos: rl.NewVector2(q.pos.X + halfX, q.pos.Y + halfY),
             size: halfSize,
             parent: q,
-            debug: "3",
+            magnet: nil,
         },
     }
-    fmt.Println(q.debug)
-    fmt.Println("halfX", halfX, "halfY", halfY)
-    for i, node := range q.nodes {
-        fmt.Println(i, node.pos, node.size)
-    }
-    // fmt.Println(q.nodes)
 }
 
 func (q *quadnode) drawBoundaries() {
@@ -83,16 +118,8 @@ func (q *quadnode) drawBoundaries() {
     }
 }
 
-type magnet struct {
-    pos rl.Vector2
-    speed rl.Vector2
-    color rl.Color
-    mass float32
-    radius float32
-}
-
 // parâmetros
-const initalMagnetCount = 10
+const initalMagnetCount = 20
 const windowWidth = 700
 const windowHeight = 700
 const magnetRadius = 5 
@@ -194,13 +221,8 @@ func main() {
 
     magnets := randomMagnets(initalMagnetCount)
 
-    quadtree := newQuadTree()
-    quadtree.subdivide()
-    quadtree.nodes[0].subdivide()
-    quadtree.nodes[1].subdivide()
-    quadtree.nodes[2].subdivide()
-    quadtree.nodes[3].subdivide()
-    quadtree.nodes[2].nodes[0].subdivide()
+    quadtree := newQuadTreeRoot()
+    quadtree.insertMagnet(magnets...)
 
     pause := true
 
@@ -213,10 +235,13 @@ func main() {
         if pause {
             rl.DrawText("pausado (E)", 0, 40, 20, rl.White)
         }
+        quadtree.drawBoundaries()
 
         {
             if rl.IsKeyPressed(rl.KeyR) {
                 magnets = randomMagnets(initalMagnetCount)
+                quadtree := newQuadTreeRoot()
+                quadtree.insertMagnet(magnets...)
             }
             if rl.IsKeyPressed(rl.KeyW) {
                 magnets = append(magnets, randomMagnets(100)...)
@@ -234,7 +259,6 @@ func main() {
             tick(magnets)
         }
 
-        quadtree.drawBoundaries()
 
         for _, magnet := range magnets {
             rl.DrawCircleV(magnet.pos, magnet.radius+1, rl.White)