Expose Dynamic Material Instances (#1225)

Moved atlasXBlendMaterials arrays to public namespace for accessibility at runtime.

See also:
https://github.com/EsotericSoftware/spine-runtimes/issues/1210

spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Public/SpineSkeletonRendererComponent.h

@@ -47,6 +47,7 @@ public:
 		
 	virtual void TickComponent (float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;
 
+	// Material Instance parents
 	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadOnly)
 	UMaterialInterface* NormalBlendMaterial;
 	
@@ -59,6 +60,23 @@ public:
 	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadOnly)
 	UMaterialInterface* ScreenBlendMaterial;
 
+	// Need to hold on to the dynamic instances, or the GC will kill us while updating them
+	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
+	TArray<UMaterialInstanceDynamic*> atlasNormalBlendMaterials;
+	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToNormalBlendMaterial;
+	
+	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
+	TArray<UMaterialInstanceDynamic*> atlasAdditiveBlendMaterials;
+	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToAdditiveBlendMaterial;
+	
+	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
+	TArray<UMaterialInstanceDynamic*> atlasMultiplyBlendMaterials;
+	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToMultiplyBlendMaterial;
+	
+	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
+	TArray<UMaterialInstanceDynamic*> atlasScreenBlendMaterials;
+	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToScreenBlendMaterial;
+	
 	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
 	float DepthOffset = 0.1f;
 	
@@ -68,9 +86,9 @@ public:
 	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
 	FLinearColor Color = FLinearColor(1, 1, 1, 1);
 
-    /** Whether to generate collision geometry for the skeleton, or not. */
-    UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
-    bool bCreateCollision;
+    	/** Whether to generate collision geometry for the skeleton, or not. */
+    	UPROPERTY(Category = Spine, EditAnywhere, BlueprintReadWrite)
+    	bool bCreateCollision;
 
 	virtual void FinishDestroy() override;
 	
@@ -79,23 +97,6 @@ protected:
 
 	void Flush (int &Idx, TArray<FVector> &Vertices, TArray<int32> &Indices, TArray<FVector2D> &Uvs, TArray<FColor> &Colors, TArray<FVector> &Colors2, UMaterialInstanceDynamic* Material);
 	
-	// Need to hold on to the dynamic instances, or the GC will kill us while updating them
-	UPROPERTY()
-	TArray<UMaterialInstanceDynamic*> atlasNormalBlendMaterials;
-	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToNormalBlendMaterial;
-	
-	UPROPERTY()
-	TArray<UMaterialInstanceDynamic*> atlasAdditiveBlendMaterials;
-	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToAdditiveBlendMaterial;
-	
-	UPROPERTY()
-	TArray<UMaterialInstanceDynamic*> atlasMultiplyBlendMaterials;
-	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToMultiplyBlendMaterial;
-	
-	UPROPERTY()
-	TArray<UMaterialInstanceDynamic*> atlasScreenBlendMaterials;
-	TMap<spine::AtlasPage*, UMaterialInstanceDynamic*> pageToScreenBlendMaterial;
-
 	spine::Vector<float> worldVertices;
 	spine::SkeletonClipping clipper;
 };