func (sp *PlayerController) OnCollisionEnter(arbiter engine.Arbiter) bool {
//println("Enter " + arbiter.GameObjectB().Name())
count := 0
for _, con := range arbiter.Contacts {
//println(arbiter.Normal(con).Y)
if -arbiter.Normal(con).Y > 0.9 {
count++
}
}
if count >= 2 {
sp.Floor = arbiter.GameObjectB()
}
return true
}