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View, browse and sort the ever-growing list of sessions by day, pass type, topic, and format. With this Session Viewer, you can view GDC 2023 session details and speakers, and share your favorites via social media. You will be able to build your schedule and access it during the show via export or Mobile App, once live. Sessions do fill up and seating is first come, first serve, so arrive early to sessions that you would like to attend.

Online Game Technology Summit: Predicted Physics-Based Multiplayer in 'Space Engineers'

Jan Hlousek  (Technical Lead, Keen Software House)

Location: Room 3005, West Hall

Date: Monday, March 20

Time: 10:50 am - 11:50 am

Pass Type: All Access Pass, Summits Pass

Topic: Programming

Format: Lecture

Vault Recording: Video

Audience Level: All

Prediction is a widely used technique for lag compensation. It works well for entities like a character or vehicle moving on the static surface. But imagine a mothership, containing a hangar with smaller ships... with characters moving inside.

In this session, Jan Hlousek, Technical Lead at Keen Software House, will present improvements to this technique as implemented in the Space Engineer's multiplayer solution—using a hierarchical approach with dynamic parenting and hybrid static/dynamic physics setup.

Jan will also share a range of issues faced during the development process and their solutions.


Attendees are taken on the journey from a basic prediction model to predicting outcomes of an entity inside a complex physics based simulation, influenced by multiple other players.

Intended Audience

This is for multiplayer programmers and students. No prerequisite knowledge is necessary; however, those with prior multiplayer-related knowledge may grasp the key concepts more easily.