CODEWITHSUNDEEP
c#unity-game-enginesynchronizationmultiplayerphoton
Harsh Priyadarshi
Harsh Priyadarshi

Reputation: 105

Synchronising drawing using PUN

I have implemented annotation feature which is similar to drawing in VR. Drawing is a Unity trail and its shape depends on its trajectory. This is where real problem comes. We are synchronising the drawing in realtime using PhotonTransformView which syncs world position of the trail. But here is the output. The synchronised drawing looks so different from the original one.

Here is sync configuration code:

public void SetupSync(int viewId, int controllingPlayer)
{
   if (PhotonNetwork.inRoom)
   {
      photonView = gameObject.AddComponent<PhotonView>();
      photonView.ownershipTransfer = OwnershipOption.Takeover;
      photonView.synchronization = ViewSynchronization.ReliableDeltaCompressed;
      photonView.viewID = viewId;

      photonTransformView = gameObject.AddComponent<PhotonTransformView>();
      photonTransformView.m_PositionModel.SynchronizeEnabled = true;

      photonView.ObservedComponents = new List<Component>();
      photonView.ObservedComponents.Add(photonTransformView);
      photonView.TransferOwnership(controllingPlayer);
   }
}

How can we make the drawing on two systems more similar? I have seen cases where people have been able to synchronise these perfectly. Check this. What are they doing?

Upvotes: 1

Views: 602

Answers (2)

Mangue Jefferson
Mangue Jefferson

Reputation: 1

Martjin Pieters's answer is the correct way to do it. But for those who have the same problem for a different situations, it comes from this line:

photonView.synchronization = ViewSynchronization.ReliableDeltaCompressed;

It's basically compressing data and not sending the new one if it's too close to the last data sent. Just switch it Unreliable and all the data will be directly sent.

Upvotes: 0

user178302
user178302

Reputation:

Yes, PhotonTransformView is not suitable for this.

You could send a reliable rpc every x milliseconds with the list of points since the last rpc. That's when it's being drawn live, and when the drawing is finished, you cache the whole drawing definition in a database given a drawing Id. Then drawings can be retrieved later by players joining the room after the drawing was done or even loaded from a list of drawing or by any arbitrary logic.

All in all you need two different system, one when drawing is live, and one when drawing is done.

Upvotes: 1

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