Recreate the BSP tree structure through a GameObject hierarchy. This gives a bit more insight into the structure of the map data.

Assets/Scripts/Modules/BrushModel.cs

@@ -13,9 +13,17 @@ public class BrushModel
     private readonly List<Vector2> tempLightmapUVs = new List<Vector2>();
     private readonly List<ushort> tempIndices = new List<ushort>();
 
+    private readonly GameObject rootGameObject;
+    private readonly Material debugMaterial;
+
     public BrushModel(string name)
     {
         this.name = name;
+
+        rootGameObject = new GameObject(name);
+        rootGameObject.transform.SetPositionAndRotation(Vector3.zero, Quaternion.identity);
+        
+        debugMaterial = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
     }
 
     public void ImportMeshData(QModel model)
@@ -25,49 +33,31 @@ public class BrushModel
 
         for (int modelIdx = 0; modelIdx < subModels.Length; ++modelIdx)
         {
-            var headNode = subModels[modelIdx].GetHeadNode(model);
-            CreateNodeMeshes(headNode, surfaces);
-        }
-
-        // DEBUG
-        var go = new GameObject(name);
-        var mat = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
-        
-        for (int i = 0; i < meshes.Count; ++i)
-        {
-            var mesh = meshes[i];
-
-            var meshGO = new GameObject($"Surface_{i}");
-            meshGO.transform.SetParent(go.transform);
+            var modelGO = new GameObject($"SubModel_{modelIdx}");
+            modelGO.transform.SetParent(rootGameObject.transform);
             
-            var mf = meshGO.AddComponent<MeshFilter>();
-            mf.sharedMesh = mesh;
-            
-            var mr = meshGO.AddComponent<MeshRenderer>();
-            mr.sharedMaterial = mat;
-            mr.shadowCastingMode = ShadowCastingMode.Off;
-            mr.receiveShadows = false;
-            mr.lightProbeUsage = LightProbeUsage.Off;
-            mr.reflectionProbeUsage = ReflectionProbeUsage.Off;
+            var headNode = subModels[modelIdx].GetHeadNode(model);
+            CreateNodeMeshes(headNode, surfaces, modelGO);
         }
-        
-        go.transform.SetPositionAndRotation(Vector3.zero, Quaternion.identity);
     }
 
-    private void CreateNodeMeshes(QNode node, QSurface[] surfaces)
+    private void CreateNodeMeshes(QNode node, QSurface[] surfaces, GameObject parentGO)
     {
         if (node.contents < 0)  // Leaf node
             return;
         
-        CreateSurfaceMeshes(node, surfaces);
+        var nodeGO = new GameObject("Node");
+        nodeGO.transform.SetParent(parentGO.transform);
+        
+        CreateSurfaceMeshes(node, surfaces, nodeGO);
 
         foreach (var childNode in node.Children)
         {
-            CreateNodeMeshes(childNode, surfaces);
+            CreateNodeMeshes(childNode, surfaces, nodeGO);
         }
     }
 
-    private void CreateSurfaceMeshes(QNode node, QSurface[] surfaces)
+    private void CreateSurfaceMeshes(QNode node, QSurface[] surfaces, GameObject nodeGO)
     {
         for (int surfIdx = 0; surfIdx < node.numSurfaces; ++surfIdx)
         {
@@ -96,6 +86,7 @@ public class BrushModel
                 }
 
                 Mesh mesh = new Mesh();
+                mesh.name = $"Surface_{node.firstSurface + surfIdx}";
                 mesh.SetVertices(tempVertices);
                 mesh.SetUVs(0, tempTextureUVs);
                 mesh.SetUVs(1, tempLightmapUVs);
@@ -103,9 +94,27 @@ public class BrushModel
                 mesh.RecalculateNormals();
                 mesh.UploadMeshData(true);
                 meshes.Add(mesh);
+                
+                CreateMeshObject(mesh, nodeGO);
             }
 
             var texNum = surface.TextureInfo.Texture.TextureNum;
         }
     }
+
+    private void CreateMeshObject(Mesh mesh, GameObject parentGO)
+    {
+        var meshGO = new GameObject(mesh.name);
+        meshGO.transform.SetParent(parentGO.transform);
+
+        var mf = meshGO.AddComponent<MeshFilter>();
+        mf.sharedMesh = mesh;
+
+        var mr = meshGO.AddComponent<MeshRenderer>();
+        mr.sharedMaterial = debugMaterial;
+        mr.shadowCastingMode = ShadowCastingMode.Off;
+        mr.receiveShadows = false;
+        mr.lightProbeUsage = LightProbeUsage.Off;
+        mr.reflectionProbeUsage = ReflectionProbeUsage.Off;
+    }
 }