Simple lazy loading

Source/MasterTestProject/Tileset.cpp

@@ -85,7 +85,18 @@ double FTile::getScreenSpaceError(double lambda, FVector CamLocation)
 void FTile::setVisible(bool visible)
 {
 	if (content.tiles.Num() == 0 && !content.tileset) {
-		if (visible) {
+		if (!content.loadingStarted && visible && !content.url.IsEmpty()) {
+
+			if (parentTilset) {
+				UTileDownloader *downloader = NewObject<UTileDownloader>(UTileDownloader::StaticClass());
+				downloader->GetTileContent(parentTilset->parentActor, &content, parentTilset->absoluteURL, this);
+				content.loadingStarted = true;
+			}
+			else {
+				UE_LOG(TILES, Error, TEXT("Parent tilset NUll"));
+			}
+		
+
 			//load
 		}
 
@@ -121,7 +132,7 @@ void ATilesetActor::updateScreenSpaceError(FTile* current, double currentSSE, do
 			child->setVisible(false);
 		}
 
-		UE_LOG(TILES, Error, TEXT("Set Visible %s SSError= %f"), *current->content.url, ScreenSpaceError1);
+		//UE_LOG(TILES, Error, TEXT("Set Visible %s SSError= %f"), *current->content.url, ScreenSpaceError1);
 	}
 
 
@@ -156,6 +167,7 @@ FTileset* ATilesetActor::parseTileset(FString JsonString, FString BaseURL)
 		FTileset *tileset = new FTileset();
 		bool success = FJsonObjectConverter::JsonObjectToUStruct<FTileset>(JsonParsed.ToSharedRef(), tileset, 0, 0);
 		tileset->absoluteURL = BaseURL;
+		tileset->parentActor = this;
 
 		TSharedPtr<FJsonObject> root = JsonParsed->GetObjectField("root");
 		ATilesetActor::parseTile(root, &tileset->root, tileset);
@@ -191,11 +203,6 @@ void ATilesetActor::parseTile(TSharedPtr<FJsonObject> json, FTile *targetTile, F
 		UE_LOG(TILES, Log, TEXT("Parsed Tile %s: Success:%s Version:\"%s\" no Childs "), *targetTile->content.url, success ? TEXT("True") : TEXT("False"), *targetTile->content.url);
 	}
 
-	if (!targetTile->content.url.IsEmpty()) {
-		UTileDownloader *downloader = NewObject<UTileDownloader>(UTileDownloader::StaticClass());
-		downloader->GetTileContent(this, &targetTile->content, parent->absoluteURL, targetTile);
-
-	}
 }
 
 void ATilesetActor::parseBatched3DTile(const TArray<uint8> data, FTile * tile)

Source/MasterTestProject/Tileset.h

@@ -90,13 +90,14 @@ struct FTileContent
 	UPROPERTY()
 		FString url;
 
-	//bool loadingStarted;
+	bool loadingStarted;
 	TArray<uint8> content;
 	struct FTileset *tileset;
 	TArray<class AProceduralEntity*> tiles;
 
 	FTileContent() {
 		tileset = nullptr;
+		loadingStarted = false;
 	}
 
 };
@@ -174,10 +175,12 @@ struct FTileset
 
 	FString absoluteURL;
 	FTile* parent;
+	class ATilesetActor* parentActor;
 
 	FTileset() {
 		geometricError = -1;
 		parent = nullptr;
+		parentActor = nullptr;
 	}
 };