![]() ![]() ![]() After validating that the timestamp is within a reasonable range, the server rewinds back to a snapshot of the state at that time, applies the event, and re-simulates back to the current point in time. The client reports each of its events to the server along with a timestamp obtained from ‘Workspace:GetServerTimeNow()’. In order to stay responsive, the client predicts its own state based on inputs from the user and the last known state of the server. This is to allow us to keep a copy of the original states for rollback. Crucially, this does not mutate the original state in any way. We then have a function that will take the current state and an action, along with a timestamp of when they happened, and produce a new state. Swings are sent through RemoteEvents, as we want to be sure they come in, but movements are sent through UnreliableRemoteEvents, because if one of those packets drop, we can feel safe knowing we will eventually get another packet to replace it. We start by defining a structure for the shared state of the court, which includes the position and velocity of the ball as 'Vector3’s, the player position and directions as 'Vector2’s, and any currently active impacts.Ĭlients send “actions” to the server, either a swing or a move. We also built a prediction and rollback model to make for a completely smooth experience. This tennis game appears simple on the surface, but utilizes 'UnreliableRemoteEvent’s under the hood to create a totally server authoritative, secure experience. It’s one of the millions of unique, user-generated 3D experiences created on Roblox. Without further ado, here’s some of the experiences we wanted to share: Server Authoritative TennisĬheck out Server Authoritative Tennis. We thought it’d be cool to share some of the things we built, but since we hacked our way through this week, all the uncopylocked places that we’re providing come with no warranty. This diversity and sense of fun leads to tons of fun and wacky projects, and plenty of learnings that we can use over the next year to help us make creating on Roblox even better! And it means you’ll see people who’ve never made a game before working with folks who used to be (or still are!) Roblox creators themselves.ĭuring Game Jam, anything goes and it shows! The only rule is that we have to show off whatever we made at the end of the week. There’s a huge variety of experience in the Creator organization, so there’s always something to learn. In addition to being beneficial to our jobs, game jams are just plain fun! It’s a great excuse to get excited about the platform, and to work with folks that we normally don’t have a chance to, which can lead to all sorts of new connections and ideas. It’s one thing to see a bug reported on the developer forum, and another to run into it yourself! We keep a running list of all the sticking points we run into over the course of the jam so that we can work on them over the next year. ![]() And more importantly they allow us to see how much we can still improve. These annual game jams provide a way for those of us who work everyday to improve creating on Roblox to check in and see all of our progress over the last year. Everyone from engineering, product, design, art, and more spent a week in between our busy jobs to build experiences, assets, and plugins with Roblox Studio. Thank you for helping to keep the Roblox community safe.At the beginning of the year, the Roblox Creator organization (the people that focus on building things for all of you creators!) got together for our second annual Game Jam. Security research is limited to Roblox client binaries, game server, and web application.Give Roblox a reasonable time to correct the issue before making any information public.Do not modify or access data that does not belong to you.Make a good faith effort to avoid privacy violations, destruction of data, and interruption or degradation of our services.Provide details of the vulnerability, including information needed to reproduce and validate the vulnerability and a Proof of Concept (POC).To encourage responsible reporting, we will not take legal action against you nor ask law enforcement to investigate you provided you comply with the following responsible disclosure guidelines: We will investigate legitimate reports and make every effort to quickly correct any vulnerability. Check the program's details for current reward amounts. Successful security bug submissions are eligible for financial rewards. Please pay special attention to the program's scope to ensure any testing you perform doesn't violate the program's policy. If you think you’ve found a security issue on any of our products, please let us know via our program on. Roblox recognizes the important role that our user community and a community of security researchers play in helping to keep Roblox and our community safe. ![]()
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