From d63d3cedd258ead4ea21d587ec7691753cd766da Mon Sep 17 00:00:00 2001
From: Pascal Serrarens <pse@pale.blue>
Date: Wed, 11 Jun 2025 14:38:36 +0200
Subject: [PATCH] Add convex mesh colliders for GLTF meshes

---
 Unity/Thing.cs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/Unity/Thing.cs b/Unity/Thing.cs
index db37889..866b7a0 100644
--- a/Unity/Thing.cs
+++ b/Unity/Thing.cs
@@ -177,6 +177,7 @@ namespace RoboidControl.Unity {
 
 #if GLTF            
         bool loadingModel = false;
+
         private async void ProcessGltfModel(RoboidControl.Thing coreThing) {
             if (!loadingModel) {
                 loadingModel = true;
@@ -192,7 +193,7 @@ namespace RoboidControl.Unity {
                     Thing[] things = FindObjectsOfType<Thing>();
                     Thing parentThing = null;
                     foreach (Thing thing in things) {
-                        if (thing.core.owner.networkId == coreThing.owner.networkId && thing.core.id == coreThing.id) {
+                        if (thing.core != null && thing.core.owner.networkId == coreThing.owner.networkId && thing.core.id == coreThing.id) {
                             parentTransform = thing.transform;
                             parentThing = thing;
                         }
@@ -212,7 +213,8 @@ namespace RoboidControl.Unity {
                     }
                     else
                         ScanForThings(parentTransform);
-                }
+
+                    AddMeshColliders(parentTransform);                }
                 else {
                     this.transform.localScale = Vector3.one * 1;
                 }
@@ -262,6 +264,15 @@ namespace RoboidControl.Unity {
             return null;
         }
 
+        private void AddMeshColliders(Transform rootTransform) {
+            MeshRenderer[] meshRenderers = rootTransform.GetComponentsInChildren<MeshRenderer>();
+            foreach (MeshRenderer meshRenderer in meshRenderers) {
+                MeshFilter meshFilter = meshRenderer.GetComponent<MeshFilter>();
+                MeshCollider meshCollider = meshRenderer.gameObject.AddComponent<MeshCollider>();
+                meshCollider.sharedMesh = meshFilter.sharedMesh;
+                meshCollider.convex = true;
+            }
+        }
 
         /// <summary>
         /// Handle a Pose event