SMOOTH rope reconciliation

No collisions or enemies tho

Assets/Prefabs/Rope.prefab

@@ -179,7 +179,7 @@ LineRenderer:
       m_Curve:
       - serializedVersion: 3
         time: 0
-        value: 0.2280693
+        value: 0.2160211
         inSlope: 0
         outSlope: 0
         tangentMode: 0

Assets/Scenes/RopeOverhaulGame.unity

@@ -2238,9 +2238,9 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 34894283}
+  - component: {fileID: 34894286}
   - component: {fileID: 34894284}
   - component: {fileID: 34894285}
-  - component: {fileID: 34894286}
   m_Layer: 0
   m_Name: Rope
   m_TagString: Untagged
@@ -2276,12 +2276,14 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   solveIterations: 10
-  subDivision: 20
-  distBetweenRopePoints: 1.5
+  subDivision: 30
+  distBetweenRopePoints: 0.75
   lineRenderer: {fileID: 34894285}
   rope:
     points: []
     sticks: []
+  reconciliateThreshold: 2
+  reconciliateLerpFrameDuration: 9
   stateBuffer:
     buffer: []
     bufferSize: 0
@@ -2294,7 +2296,7 @@ LineRenderer:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 34894282}
   m_Enabled: 1
-  m_CastShadows: 1
+  m_CastShadows: 0
   m_ReceiveShadows: 1
   m_DynamicOccludee: 1
   m_StaticShadowCaster: 0
@@ -2308,7 +2310,7 @@ LineRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 10306, guid: 0000000000000000f000000000000000, type: 0}
+  - {fileID: 2100000, guid: 62e10f2f26f232f49affb7663a8064fb, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -2338,7 +2340,7 @@ LineRenderer:
       m_Curve:
       - serializedVersion: 3
         time: 0
-        value: 0.10041046
+        value: 0.21601537
         inSlope: 0
         outSlope: 0
         tangentMode: 0
@@ -2381,7 +2383,7 @@ LineRenderer:
     numCornerVertices: 0
     numCapVertices: 0
     alignment: 0
-    textureMode: 0
+    textureMode: 1
     textureScale: {x: 1, y: 1}
     shadowBias: 0.5
     generateLightingData: 0

Assets/Scripts/Rope/Rope.cs

@@ -93,6 +93,22 @@ public class Rope
         return builder.Build();
     }
 
+    public Rope Copy(float stickLength)
+    {
+        RopeBuilder builder = new();
+
+        foreach (var point in points)
+        {
+            builder.AddPoint(new Point(point.position, point.locked));
+        }
+        for (int i = 0; i < points.Length - 1; i++)
+        {
+            builder.ConnectPointsWithDesiredLength(i, i + 1, stickLength);
+        }
+
+        return builder.Build();
+    }
+
     /* public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
     {
         int pLen = 0;

Assets/Scripts/Rope/RopeSimulator.cs

@@ -2,6 +2,7 @@ using UnityEngine;
 using UnityEngine.Assertions;
 using System.Linq;
 using Unity.Netcode;
+using System.Collections;
 
 public class RopeSimulator : NetworkBehaviour
 {
@@ -19,11 +20,16 @@ public class RopeSimulator : NetworkBehaviour
     [SerializeField] Rope rope;
 
     [Header("Networking")]
-    [SerializeField] CircularBuffer<RopeState> stateBuffer;
     [SerializeField] float reconciliateThreshold = 1f;
+    [SerializeField] int reconciliateLerpFrameDuration = 5;
+    [SerializeField] CircularBuffer<RopeState> stateBuffer;
+    [SerializeField] float reconciliateCooldownDuration = 1f;
+    float reconciliateCooldown = -3f; // First reconciliate after n seconds after its begun to populate stateBuffer
     private const int k_stateBufferSize = 128;
     private int currentTick => NetworkManager.Singleton.NetworkTickSystem.LocalTime.Tick;
 
+    bool initted = false;
+
     private void Awake()
     {
         this.rope = null;
@@ -45,8 +51,9 @@ public class RopeSimulator : NetworkBehaviour
 
     private void Update()
     {
-        if (rope == null) return;
+        if (!initted) return;
 
+        reconciliateCooldown += Time.deltaTime;
         rope.points.First().position = ropeStart.position;
         rope.points.Last().position = ropeEnd.position;
         Simulate(this.rope, Time.deltaTime, this.distBetweenRopePoints, this.solveIterations);
@@ -61,6 +68,8 @@ public class RopeSimulator : NetworkBehaviour
 
         this.rope = RopeSimulator.BuildRope(this.ropeStart, this.ropeEnd, this.subDivision, this.distBetweenRopePoints);
         NetworkManager.Singleton.NetworkTickSystem.Tick += NetworkTick;
+
+        initted = true;
     }
 
     private void NetworkTick()
@@ -68,7 +77,8 @@ public class RopeSimulator : NetworkBehaviour
         RopeState ropeState = new()
         {
             tick = currentTick,
-            nrope = Rope.ToNetworkRope(this.rope)
+            nrope = Rope.ToNetworkRope(this.rope),
+            playerPositions = GameObject.FindObjectsByType<PlayerMovement>(FindObjectsSortMode.None).Select(p => new Vector3(p.transform.position.x, p.transform.position.y, p.GetComponent<NetworkObject>().NetworkObjectId)).ToArray()
         };
 
         stateBuffer.Add(ropeState, currentTick);
@@ -84,13 +94,52 @@ public class RopeSimulator : NetworkBehaviour
     {
         RopeState clientState = this.stateBuffer.Get(serverState.tick);
         Rope serverRope = Rope.FromNetworkRope(serverState.nrope, this.distBetweenRopePoints);
+
+        // Not enough information on client to reconcile
+        if (clientState.nrope.Equals(default(NetworkRope)))
+            return;
+
         Rope previousClientRope = Rope.FromNetworkRope(clientState.nrope, this.distBetweenRopePoints);
         float diff = Rope.CalcDiff(previousClientRope, serverRope);
-        Debug.Log($"Diff: {diff}, ({serverState.tick})/({clientState.tick})");
+        // Debug.Log($"Diff: {diff}, ({serverState.tick})/({currentTick})");
 
-        if (diff > reconciliateThreshold)
+        if (diff > reconciliateThreshold && reconciliateCooldown >= reconciliateCooldownDuration)
         {
-            this.rope = serverRope;
+            reconciliateCooldown = 0f;
+            // StopCoroutine("ReconciliateLerp");
+            // StartCoroutine(ReconciliateLerp(serverRope));
+            Rope localCopy = serverRope.Copy(this.distBetweenRopePoints);
+            int ticksToResimulate = currentTick - serverState.tick;
+            Debug.Log($"Resimulating {ticksToResimulate} ticks");
+            for (int i = 1; i <= ticksToResimulate; i++)
+            {
+                RopeState intermediateState = stateBuffer.Get(serverState.tick + i);
+                Vector3 intermediateRopeStart = new Vector3(intermediateState.playerPositions[0].x, intermediateState.playerPositions[0].y, ropeStart.position.z);
+                Vector3 intermediateRopeEnd = new Vector3(intermediateState.playerPositions[1].x, intermediateState.playerPositions[1].y, ropeEnd.position.z);
+                rope.points.First().position = intermediateRopeStart;
+                rope.points.Last().position = intermediateRopeEnd;
+
+                Simulate(localCopy, 1f / (float) NetworkManager.Singleton.NetworkTickSystem.TickRate, this.distBetweenRopePoints, this.solveIterations);
+            }
+            localCopy.points.First().position = ropeStart.position;
+            localCopy.points.Last().position = ropeEnd.position;
+
+            StopCoroutine("LerpRope");
+            LerpRope(this.rope, localCopy);
+        }
+    }
+
+    IEnumerator LerpRope(Rope from, Rope to)
+    {
+        for (int i = 1; i <= reconciliateLerpFrameDuration; i++)
+        {
+            float t = (float) i / (float) reconciliateLerpFrameDuration;
+            for (int j = 0; j < this.rope.points.Length; j++)
+            {
+                from.points[j].position = Vector3.Lerp(this.rope.points[j].position, to.points[j].position, t);
+                from.points[j].prevPosition = Vector3.Lerp(this.rope.points[j].prevPosition, to.points[j].prevPosition, t);
+            }
+            yield return new WaitForEndOfFrame();
         }
     }
 

Assets/Scripts/Rope/RopeState.cs

@@ -6,6 +6,7 @@ public struct RopeState : INetworkSerializable
 {
     public int tick;
     public NetworkRope nrope;
+    public Vector3[] playerPositions;
 
     public override int GetHashCode()
     {