ARKit PhysicsDelegate

PhysicsDelegate.cs

 public class PhysicsDelegate : SCNPhysicsContactDelegate
 {
     IList<SCNNode> animatedNodes=new List<SCNNode>(); 

     public override void DidBeginContact(SCNPhysicsWorld world, SCNPhysicsContact contact)
     {
           var nodeA = contact.NodeA;
           var nodeB = contact.NodeB;
           SCNNode target = null;
           if (nodeA.PhysicsBody.CategoryBitMask == (int)BitMaskCategory.Pokemon)
           {
               target = nodeA;
           }
           else if (nodeB.PhysicsBody.CategoryBitMask == (int)BitMaskCategory.Pokemon)
           {
               target = nodeB;
           }

           if (target != null && !animatedNodes.Contains(target))
           {
               var targetScale=target.Scale;
               
               animatedNodes.Add(target);

               target.RunAction(SCNAction.Sequence(new SCNAction[]{
                        SCNAction.ScaleTo(0, 1.0f),
                        SCNAction.ScaleTo(targetScale.X, 2.0f),
                }),()=>{
                        animatedNodes.Remove(target);
                });
            }
    }
}