Mieszko Zielinski (Epic Games), White Nights 2015
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Mieszko Zielinski, Lead AI Programmer, Epic Games — UE4 Large World AI Navigation Mieszko Zielinski, Lead AI Programmer, Epic Games UE4: навигация AI в большом мире
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Mieszko Zielinski (Epic Games), White Nights 2015
- 1. UE4 Open WorldAI Navigation And how did we get here
- 2. RecastbyMikkoMononen Best thingthathappenedto gameAI navigationsince sliced bread! • Lightweight,fastand open-source! • De facto industry standard • Resurrected and availableon github https://github.com/memononen/recastnavigation
- 4. UE4 Navigation parts • Navigation bounds volumes • Navigation relevant actors – geometry & other data (links,areas) • NavigationOctree – stores navigation-relevant data – speeds up gathering relevant data for specific navmesh tile’s generation
- 5. So what’s the problem?
- 6. This doesn’t scale all that well
- 7. GDC Demo Map, 256 km2 Naive approach Navigation Octree ~10.3GB NavMesh ~500MB Plus~30 minutenavmesh generation(8 core machine) And requires loading alllevels for navmesh generationpurposes This, of course, is useless.
- 8. Whyit was so much? • Empty NavMesh tile- 176 bytes • 10000 tiles,~50kBeach, 16000uu x 16000uu • Every piece of navigation-relevantdata kept in Navigation Octree
- 9. Solutionideas Dumpthe navigationoctree! – Static navmesh of 500MB is acceptable – Nowork required, supported out of the box – NO GO, we wanted to show dynamic navmesh generation!
- 10. Solutionideas CustomLandscape-specific navigationgraph – Mainnavoctree occupant – NO GO, more then just lanscapesin the demo
- 11. Solutionideas Highlevel navigation mesh – Huge voxels, very low precision – Low memory, fast generation – NO GO, would require a custom local-navigation solution
- 12. No worries! Low-hanging fruit solution • We don’t need allof navmesh allthe time • We need only the nav octree information required by tiles we need
- 14. Applied to UE4 Navigation System • Navigation bound stay the same • Navigation octree to store only the data relevant “now” • Introduce a way to communicateto Navigation System where navmesh isrequired
- 15. Navigation Octree • Lazy geometry gathering – outside of game thread • Landscape slicing – never stored in octree – constant cost, outside of game thread
- 16. Navigation Invokers • Internaland externalradii • Updated on a regular basis • Only “new” tiles require work
- 18. GDC Demo Map, 256 km2 Naive approach At GDC Navigation Octree ~10.3GB 572MB NavMesh ~500MB 31MB The endresult still not ideal But we’re not done yet! :D
- 19. Futurework • Don’t store anythingin nav octree unless it’s necessarry – Currently only geometry is treated the smart way • Moveable navigationbounds • Give lazily gathered octree data a lifetime limit • Multithreadedlazy geometry gathering
Notas do Editor
- Lightweight, fast and open-source! Lots of companies included it in their own source code and featured it up. De facto industry standard No excuse to have anything worse when Recast is FREE! Resurrected and available on github https://github.com/memononen/recastnavigation
- Navmesh size: And that’s after bumping Tile Size from 1600uu to 16000uu Before the change empty navmesh was consuming ~168MB (1 million tiles) Landscape the biggest nav octree offender What could we do about this? Obvioulsy, look for.. Low handing fruits
- Navigation bounds stay the same – not much we can do here, we want to be able to navigate everywhere
- Far from it! – we’d actually save memory with just sticking to static navmesh
- Moveable navigation bounds (Recast doesn’t care)