Fix some minor bugs with game pieces

src/GestureRecognizers.swift

@@ -57,6 +57,9 @@ extension RootViewController {
       hasPlacedField = true
       sceneView.hasPlacedField = true
       sceneView.trajectoryNode?.isHidden = false
+      for node in sceneView.gamePieceNodes {
+        node.isHidden = false
+      }
       sceneView.curContainerDummyNode?.isHidden = false
       floatingUI.node.addChildNode(floatingUI.scheduler.node)
       floatingUI.node.addChildNode(floatingUI.fms.node)

src/utils/ARSceneView.swift

@@ -162,23 +162,20 @@ class ARSceneView: ARSCNView {
       }
     }
 
-    // Place instances of the model at each location
-    for i in 0..<points.count {
-      gamePieceNodes[i].position = points[i]
-      gamePieceNodes[i].isHidden = !hasPlacedField
-    }
-
-    // save game piece positions
     gamePiecePositions = points
 
-    // Update transforms
     updateGamePieceTransforms()
   }
 
   func updateGamePieceTransforms() {
+    guard gamePieceNodes.count == gamePiecePositions.count else {
+      NSLog("Game piece nodes and positions are not the same length")
+      return
+    }
     for i in 0..<gamePiecePositions.count {
       gamePieceNodes[i].position = fieldNode.convertPosition(gamePiecePositions[i], to: nil)
       gamePieceNodes[i].scale = fieldNode.scale
+      gamePieceNodes[i].isHidden = !hasPlacedField
     }
   }
 

src/utils/NetworkTablesHandler.swift

@@ -104,6 +104,7 @@ class NetworkTablesHandler {
     if gamePiecesSubID != nil {
       client.unsubscribe(subID: gamePiecesSubID!)
       sceneView.gamePieceNodes.forEach { $0.removeFromParentNode() }
+      sceneView.gamePieceNodes = []
     }
 
     // Subscribe to robot position updates