Initial commit

Assets/VRMPAssets/Scripts/Gameplay/Drawing/PenTrail.cs

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+using UnityEngine;
+using UnityEngine.XR.Interaction.Toolkit;
+using UnityEngine.XR.Interaction.Toolkit.Interactables;
+
+namespace XRMultiplayer
+{
+    [RequireComponent(typeof(TrailRenderer))]
+    public class PenTrail : MonoBehaviour
+    {
+        public TrailRenderer trailRenderer => m_TrailRenderer;
+        TrailRenderer m_TrailRenderer;
+
+        [SerializeField] bool m_UseLifetime = false;
+        [SerializeField] float m_ObjectLifetimeInSeconds = 900.0f;
+
+        GameObject m_SpawnedInteractableObject;
+        Color m_StartColor;
+        float m_StartWidth;
+        // Start is called before the first frame update
+        void Awake()
+        {
+            if (!TryGetComponent(out m_TrailRenderer))
+            {
+                Utils.Log("Missing Components! Disabling Now.", 2);
+                enabled = false;
+                return;
+            }
+        }
+
+        public void SetColor(Color color)
+        {
+            m_StartColor = color;
+            UpdateColor(m_StartColor);
+        }
+
+        void UpdateColor(Color color)
+        {
+            m_TrailRenderer.material.color = color;
+            m_TrailRenderer.startColor = color;
+            m_TrailRenderer.endColor = color;
+        }
+
+        public void CreateInteractableTrail()
+        {
+            m_StartWidth = m_TrailRenderer.startWidth;
+
+            Mesh mesh = new();
+            m_TrailRenderer.BakeMesh(mesh, true);
+
+            m_SpawnedInteractableObject = new();
+            m_SpawnedInteractableObject.transform.position = Vector3.zero;
+            m_SpawnedInteractableObject.AddComponent<MeshFilter>().mesh = mesh;
+            m_SpawnedInteractableObject.AddComponent<MeshCollider>().sharedMesh = mesh;
+
+            m_SpawnedInteractableObject.transform.parent = transform;
+
+            XRSimpleInteractable interactable = m_SpawnedInteractableObject.AddComponent<XRSimpleInteractable>();
+
+            interactable.activated.AddListener(DestroyTrail);
+            interactable.hoverEntered.AddListener(HoverEntered);
+            interactable.hoverExited.AddListener(HoverExited);
+
+            if (m_UseLifetime)
+                Destroy(gameObject, m_ObjectLifetimeInSeconds);
+        }
+
+        void HoverEntered(HoverEnterEventArgs args)
+        {
+            m_TrailRenderer.startWidth = m_StartWidth * 3.0f;
+            m_TrailRenderer.endWidth = m_StartWidth * 3.0f;
+            UpdateColor(Color.red);
+        }
+
+        void HoverExited(HoverExitEventArgs args)
+        {
+            m_TrailRenderer.startWidth = m_StartWidth;
+            m_TrailRenderer.endWidth = m_StartWidth;
+            UpdateColor(m_StartColor);
+        }
+
+        void DestroyTrail(ActivateEventArgs args)
+        {
+            Destroy(gameObject);
+        }
+    }
+}

Assets/VRMPAssets/Scripts/Gameplay/Drawing/PenTrail.cs.meta

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+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/VRMPAssets/Scripts/Gameplay/Drawing/SimplePen.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using XRMultiplayer;
+
+public class SimplePen : MonoBehaviour
+{
+    [SerializeField] PenTrail m_TrailRendererPrefab;
+    [SerializeField] Transform m_PenTipTransform;
+    [SerializeField] Renderer m_PenTipRenderer;
+
+    NetworkPhysicsInteractable m_NetworkInteractable;
+
+    PenTrail m_CurrentTrailRenderer;
+
+    Color m_CurrentColor;
+
+    List<PenTrail> m_PenTrails = new();
+
+    void Awake()
+    {
+        TryGetComponent(out m_NetworkInteractable);
+    }
+
+    void Start()
+    {
+        SetColor();
+        XRINetworkGameManager.Connected.Subscribe(ConnectedToNetworkGame);
+    }
+
+    void OnDestroy()
+    {
+        XRINetworkGameManager.Connected.Unsubscribe(ConnectedToNetworkGame);
+    }
+
+    void ConnectedToNetworkGame(bool connected)
+    {
+        if (!connected)
+        {
+            foreach (var trail in m_PenTrails)
+            {
+                Destroy(trail.gameObject);
+            }
+        }
+    }
+
+    public void ToggleDrawing(bool toggle)
+    {
+        if (toggle && m_CurrentTrailRenderer == null)
+        {
+            m_CurrentTrailRenderer = Instantiate(m_TrailRendererPrefab, m_PenTipTransform.position, m_PenTipTransform.rotation, m_PenTipTransform);
+            m_CurrentTrailRenderer.SetColor(m_CurrentColor);
+        }
+        else if (!toggle && m_CurrentTrailRenderer != null)
+        {
+            m_CurrentTrailRenderer.transform.SetParent(null);
+            m_CurrentTrailRenderer.CreateInteractableTrail();
+            m_CurrentTrailRenderer = null;
+        }
+    }
+
+    public void SetColor()
+    {
+        if (XRINetworkGameManager.Instance.GetPlayerByID(m_NetworkInteractable.OwnerClientId, out XRINetworkPlayer player))
+        {
+            m_CurrentColor = player.playerColor;
+        }
+        // Failed to get player, might be offline
+        else
+        {
+            m_CurrentColor = XRINetworkGameManager.LocalPlayerColor.Value;
+        }
+        m_PenTipRenderer.material.color = m_CurrentColor;
+    }
+
+}

Assets/VRMPAssets/Scripts/Gameplay/Drawing/SimplePen.cs.meta

@@ -0,0 +1,11 @@
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