Add lenient model export mode

Penumbra/Import/Models/Export/Config.cs

@@ -3,4 +3,5 @@ namespace Penumbra.Import.Models.Export;
 public struct ExportConfig
 {
     public bool GenerateMissingBones;
+    public bool LenientMode;
 }

Penumbra/Import/Models/Export/MeshExporter.cs

@@ -445,7 +445,7 @@ public class MeshExporter
             return new VertexTexture2ColorFfxiv(
                 new Vector2(uv.X, uv.Y),
                 new Vector2(uv.Z, uv.W),
-                ToVector4(GetFirstSafe(attributes, MdlFile.VertexUsage.Color))
+                ToVector4(_config.LenientMode ? GetFirstUnsafe(attributes, MdlFile.VertexUsage.Color) : GetFirstSafe(attributes, MdlFile.VertexUsage.Color))
             );
         }
         if (_materialType == typeof(VertexTexture3))
@@ -468,7 +468,7 @@ public class MeshExporter
                 new Vector2(uv0.X, uv0.Y),
                 new Vector2(uv0.Z, uv0.W),
                 new Vector2(uv1.X, uv1.Y),
-                ToVector4(GetFirstSafe(attributes, MdlFile.VertexUsage.Color)) 
+                ToVector4(_config.LenientMode ? GetFirstUnsafe(attributes, MdlFile.VertexUsage.Color) : GetFirstSafe(attributes, MdlFile.VertexUsage.Color))
             );
         }
 
@@ -537,6 +537,23 @@ public class MeshExporter
 
         return list[0];
     }
+    
+    /// <summary> Check that the list has length 1 for any case where this is expected and return the one entry. Otherwise, report a warning. </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
+    private T GetFirstUnsafe<T>(IReadOnlyDictionary<MdlFile.VertexUsage, List<T>> attributes, MdlFile.VertexUsage usage)
+    {
+        var list = attributes[usage];
+        switch (list.Count)
+        {
+            case > 1:
+                _notifier.Warning($"Multiple usage indices encountered for {usage}.", true);
+                break;
+            case 0:
+                throw _notifier.Exception($"No usage indices encountered for {usage}");
+        }
+
+        return list[0];
+    }
 
     /// <summary> Convert a vertex attribute value to a Vector2. Supported inputs are Vector2, Vector3, and Vector4. </summary>
     private static Vector2 ToVector2(object data)

Penumbra/Import/Models/IoNotifier.cs

@@ -12,8 +12,8 @@ public record class IoNotifier
         => this with { _context = $"{_context}{context}: "};
 
     /// <summary> Send a warning with any current context to notification channels. </summary>
-    public void Warning(string content)
+    public void Warning(string content, bool ignoreDuplicates = false)
-        => SendMessage(content, Logger.LogLevel.Warning);
+        => SendMessage(content, Logger.LogLevel.Warning, ignoreDuplicates);
 
     /// <summary> Get the current warnings for this notifier. </summary>
     /// <remarks> This does not currently filter to notifications with the current notifier's context - it will return all IO notifications from all notifiers. </remarks>
@@ -31,9 +31,15 @@ public record class IoNotifier
         where TException : Exception, new()
         => (TException)Activator.CreateInstance(typeof(TException), $"{_context}{message}")!;
 
-    private void SendMessage(string message, Logger.LogLevel type)
+    private void SendMessage(string message, Logger.LogLevel type, bool ignoreDuplicates = false)
     {
         var fullText = $"{_context}{message}";
+        
+        if (ignoreDuplicates && _messages.Contains(fullText))
+        {
+            return;
+        }
+        
         Penumbra.Log.Message(type, fullText);
         _messages.Add(fullText);
     }

Penumbra/Import/Models/ModelManager.cs

@@ -16,6 +16,7 @@ using Penumbra.Meta;
 using Penumbra.Meta.Files;
 using Penumbra.Meta.Manipulations;
 using SharpGLTF.Scenes;
+using SharpGLTF.Validation;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
 
@@ -216,7 +217,10 @@ public sealed class ModelManager(IFramework framework, MetaFileManager metaFileM
 
             Penumbra.Log.Debug("[GLTF Export] Saving...");
             var gltfModel = scene.ToGltf2();
-            gltfModel.Save(outputPath);
+            gltfModel.Save(outputPath, new Schema2.WriteSettings()
+            {
+                Validation = config.LenientMode ? ValidationMode.TryFix : ValidationMode.Strict,
+            });
             Penumbra.Log.Debug("[GLTF Export] Done.");
         }
 

Penumbra/UI/AdvancedWindow/ModEditWindow.Models.cs

@@ -168,6 +168,14 @@ public partial class ModEditWindow
           + "It is primarily intended to allow exporting models weighted to bones that do not exist.\n"
           + "Before enabling, ensure dependencies are enabled in the current collection, and EST metadata is correctly configured.");
 
+        ImGui.SameLine(200 * UiHelpers.Scale + ImGui.GetStyle().ItemSpacing.X + ImGui.GetStyle().WindowPadding.X);
+
+        ImGui.Checkbox("##tryFixValidation", ref tab.ExportConfig.LenientMode);
+        ImGui.SameLine();
+        ImGuiUtil.LabeledHelpMarker("Lenient mode",
+            "Try fixing potential errors during model validation and ignore superfluous color information.\n"
+          + "This may result in a broken model, or one missing information, so use with care!");
+
         var gamePath = tab.GamePathIndex >= 0 && tab.GamePathIndex < tab.GamePaths.Count
             ? tab.GamePaths[tab.GamePathIndex]
             : _customGamePath;