Add MeshDeformation utility for generic meshes vertices morphing (eg. via Blend Shapes or Cloth)

Source/Engine/Level/Actors/AnimatedModel.h

@@ -17,7 +17,7 @@ class FLAXENGINE_API AnimatedModel : public ModelInstanceActor
 {
     DECLARE_SCENE_OBJECT(AnimatedModel);
     friend class AnimationsSystem;
-public:
+
     /// <summary>
     /// Describes the animation graph updates frequency for the animated model.
     /// </summary>
@@ -55,16 +55,27 @@ public:
     };
 
 private:
+    struct BlendShapeMesh
+    {
+        uint16 LODIndex;
+        uint16 MeshIndex;
+        uint32 Usages;
+    };
+
     GeometryDrawStateData _drawState;
     SkinnedMeshDrawData _skinningData;
     AnimationUpdateMode _actualMode;
     uint32 _counter;
     Real _lastMinDstSqr;
     uint64 _lastUpdateFrame;
-    BlendShapesInstance _blendShapes;
+    mutable MeshDeformation* _deformation = nullptr;
     ScriptingObjectReference<AnimatedModel> _masterPose;
+    Array<Pair<String, float>> _blendShapeWeights;
+    Array<BlendShapeMesh> _blendShapeMeshes;
 
 public:
+    ~AnimatedModel();
+
     /// <summary>
     /// The skinned model asset used for rendering.
     /// </summary>
@@ -291,7 +302,7 @@ public:
     API_FUNCTION() void SetBlendShapeWeight(const StringView& name, float value);
 
     /// <summary>
-    /// Clears the weights of the blend shapes (disabled any used blend shapes).
+    /// Clears the weights of the blend shapes (disables any used blend shapes).
     /// </summary>
     API_FUNCTION() void ClearBlendShapeWeights();
 
@@ -346,9 +357,9 @@ public:
 private:
     void ApplyRootMotion(const Transform& rootMotionDelta);
     void SyncParameters();
+    void RunBlendShapeDeformer(const MeshBase* mesh, struct MeshDeformationData& deformation);
 
     void Update();
-    void UpdateBounds();
     void UpdateSockets();
     void OnAnimationUpdated_Async();
     void OnAnimationUpdated_Sync();
@@ -375,6 +386,8 @@ public:
     bool IntersectsEntry(int32 entryIndex, const Ray& ray, Real& distance, Vector3& normal) override;
     bool IntersectsEntry(const Ray& ray, Real& distance, Vector3& normal, int32& entryIndex) override;
     bool GetMeshData(const MeshReference& mesh, MeshBufferType type, BytesContainer& result, int32& count) const override;
+    void UpdateBounds() override;
+    MeshDeformation* GetMeshDeformation() const override;
     void OnDeleteObject() override;
 
 protected:
@@ -384,6 +397,5 @@ protected:
     void OnEnable() override;
     void OnDisable() override;
     void OnActiveInTreeChanged() override;
-    void OnTransformChanged() override;
     void WaitForModelLoad() override;
 };