Merge model faces that share a material

project/code/TMV/Model.cs

@@ -62,7 +62,7 @@ public partial class Model : Node3D
             }
         }
 
-        var mesh = new ArrayMesh();
+        var surfaceDataMap = new Dictionary<int, MeshSurfaceData>();
         foreach (var poly in modelFile.Polygons)
         {
             var vertices = new List<Vector3>();
@@ -83,17 +83,26 @@ public partial class Model : Node3D
                 }
             }
 
-            var surfaceData = new MeshSurfaceData();
-            surfaceData.AddPolygon(vertices, normal, uvs, uvs);
-            var array = surfaceData.BuildSurfaceArray();
-            mesh.AddSurfaceFromArrays(Mesh.PrimitiveType.Triangles, array);
+            if (!surfaceDataMap.ContainsKey(poly.Data))
+            {
+                surfaceDataMap.Add(poly.Data, new MeshSurfaceData());
+            }
 
+            surfaceDataMap[poly.Data].AddPolygon(vertices, normal, uvs, uvs);
+        }
+
+        var mesh = new ArrayMesh();
+        foreach (var (materialId, surfaceData) in surfaceDataMap)
+        {
+            var array = surfaceData.BuildSurfaceArray();
+            var surfaceIdx = mesh.GetSurfaceCount();
+            mesh.AddSurfaceFromArrays(Mesh.PrimitiveType.Triangles, array);
             for (var i = 0; i < materials.Count; i++)
             {
                 var m = modelFile.Materials[i];
-                if (m.Slot == poly.Data)
+                if (m.Slot == materialId)
                 {
-                    mesh.SurfaceSetMaterial(poly.Index, materials[i]);
+                    mesh.SurfaceSetMaterial(surfaceIdx, materials[i]);
                     break;
                 }
             }

project/code/TMV/UI/MissionSelector.cs

@@ -60,7 +60,8 @@ public partial class MissionSelector : Control
 		_LoadButton.Disabled = true;
 
 		_Campaigns.AddItem("Original Missions");
-		foreach (var c in Directory.GetDirectories(_installPaths.fmsPath))
+		var paths = Directory.GetDirectories(_installPaths.fmsPath);
+		foreach (var c in paths.OrderBy(s => s))
 		{
 			_Campaigns.AddItem(c.TrimPrefix(_installPaths.fmsPath));
 		}
@@ -82,8 +83,8 @@ public partial class MissionSelector : Control
 		}
 
 		string[] extensions = { "mis", "cow" };
-		campaignPath = idx == 0 ? _installPaths.omsPath : _installPaths.fmsPath + _Campaigns.GetItemText((int)idx);
-		foreach (var f in Directory.GetFiles(campaignPath))
+		var paths = Directory.GetFiles(campaignPath);
+		foreach (var f in paths.OrderBy(s => s))
 		{
 			if (extensions.Contains(f.GetExtension().ToLower()))
 			{

project/code/TMV/UI/ModelSelector.cs

@@ -59,7 +59,8 @@ public partial class ModelSelector : Control
 		_Models.Clear();
 		_LoadButton.Disabled = true;
 
-		foreach (var m in Directory.GetFiles(_extractedObjectsPath, "*.bin", SearchOption.AllDirectories))
+		var paths = Directory.GetFiles(_extractedObjectsPath, "*.bin", SearchOption.AllDirectories);
+		foreach (var m in paths.OrderBy(s => s))
 		{
 			_Models.AddItem(m.TrimPrefix(_extractedObjectsPath));
 		}