Add ModelInstanceActor::GetMaterialSlots

Source/Engine/Content/Assets/MaterialBase.h

@@ -27,7 +27,6 @@ public:
     /// <summary>
     /// Returns true if material is an material instance.
     /// </summary>
-    /// <returns>True if it's a material instance, otherwise false.</returns>
     virtual bool IsMaterialInstance() const = 0;
 
 public:

Source/Engine/Level/Actors/AnimatedModel.cpp

@@ -898,6 +898,14 @@ void AnimatedModel::Deserialize(DeserializeStream& stream, ISerializeModifier* m
         DrawModes |= DrawPass::GlobalSurfaceAtlas;
 }
 
+const Span<MaterialSlot> AnimatedModel::GetMaterialSlots() const
+{
+    const auto model = SkinnedModel.Get();
+    if (model && !model->WaitForLoaded())
+        return ToSpan(model->MaterialSlots);
+    return Span<MaterialSlot>();
+}
+
 MaterialBase* AnimatedModel::GetMaterial(int32 entryIndex)
 {
     if (SkinnedModel)

Source/Engine/Level/Actors/AnimatedModel.h

@@ -373,6 +373,7 @@ public:
     bool IntersectsItself(const Ray& ray, Real& distance, Vector3& normal) override;
     void Serialize(SerializeStream& stream, const void* otherObj) override;
     void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) override;
+    const Span<MaterialSlot> GetMaterialSlots() const override;
     MaterialBase* GetMaterial(int32 entryIndex) override;
     bool IntersectsEntry(int32 entryIndex, const Ray& ray, Real& distance, Vector3& normal) override;
     bool IntersectsEntry(const Ray& ray, Real& distance, Vector3& normal, int32& entryIndex) override;

Source/Engine/Level/Actors/ModelInstanceActor.h

@@ -35,6 +35,11 @@ public:
     /// </summary>
     API_PROPERTY() void SetEntries(const Array<ModelInstanceEntry>& value);
 
+    /// <summary>
+    /// Gets the material slots array set on the asset (eg. model or skinned model asset).
+    /// </summary>
+    API_PROPERTY(Sealed) virtual const Span<class MaterialSlot> GetMaterialSlots() const = 0;
+
     /// <summary>
     /// Gets the material used to draw the meshes which are assigned to that slot (set in Entries or model's default).
     /// </summary>

Source/Engine/Level/Actors/SplineModel.cpp

@@ -341,6 +341,14 @@ void SplineModel::OnParentChanged()
     OnSplineUpdated();
 }
 
+const Span<MaterialSlot> SplineModel::GetMaterialSlots() const
+{
+    const auto model = Model.Get();
+    if (model && !model->WaitForLoaded())
+        return ToSpan(model->MaterialSlots);
+    return Span<MaterialSlot>();
+}
+
 MaterialBase* SplineModel::GetMaterial(int32 entryIndex)
 {
     if (Model)

Source/Engine/Level/Actors/SplineModel.h

@@ -115,6 +115,7 @@ public:
     void Serialize(SerializeStream& stream, const void* otherObj) override;
     void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) override;
     void OnParentChanged() override;
+    const Span<MaterialSlot> GetMaterialSlots() const override;
     MaterialBase* GetMaterial(int32 entryIndex) override;
 
 protected:

Source/Engine/Level/Actors/StaticModel.cpp

@@ -535,6 +535,14 @@ void StaticModel::Deserialize(DeserializeStream& stream, ISerializeModifier* mod
     }
 }
 
+const Span<MaterialSlot> StaticModel::GetMaterialSlots() const
+{
+    const auto model = Model.Get();
+    if (model && !model->WaitForLoaded())
+        return ToSpan(model->MaterialSlots);
+    return Span<MaterialSlot>();
+}
+
 MaterialBase* StaticModel::GetMaterial(int32 entryIndex)
 {
     if (Model)

Source/Engine/Level/Actors/StaticModel.h

@@ -166,6 +166,7 @@ public:
     bool IntersectsItself(const Ray& ray, Real& distance, Vector3& normal) override;
     void Serialize(SerializeStream& stream, const void* otherObj) override;
     void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) override;
+    const Span<MaterialSlot> GetMaterialSlots() const override;
     MaterialBase* GetMaterial(int32 entryIndex) override;
     bool IntersectsEntry(int32 entryIndex, const Ray& ray, Real& distance, Vector3& normal) override;
     bool IntersectsEntry(const Ray& ray, Real& distance, Vector3& normal, int32& entryIndex) override;