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Hackathon Proposal:Feature Scaling: Difference between revisions
Hackathon Proposal:Feature Scaling (view source)
Revision as of 19:57, 21 September 2021
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{{Hackathon Proposal | {{Hackathon Proposal | ||
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|supporters= please add yourself if you are interested in working on this | |supporters= please add yourself if you are interested in working on this | ||
|summary = a test mode, which flies a 30 second replay tape with the C172 around Hawaii, measures the FPS and repeats for each graphical config: that would be reasonably simple to code up, and give something approximating a sane value (modulo all the zillion ways it can screw up, but…) <ref>https://sourceforge.net/p/flightgear/mailman/message/37129569/</ref> | |summary = a test mode, which flies a 30 second replay tape with the C172 around Hawaii, measures the FPS and repeats for each graphical config: that would be reasonably simple to code up, and give something approximating a sane value (modulo all the zillion ways it can screw up, but…) <ref>https://sourceforge.net/p/flightgear/mailman/message/37129569/</ref> | ||
|background= There is a performance problem in OSG with too many LOD nodes deep down in the tree, but that’s the usual | |background= There is a performance problem in OSG with too many LOD nodes deep down in the tree, but that’s the usual '''too many nodes == small batch sizes == too many draw calls == sucky performance''' problem. | ||
But there’s no problem with LOD nodes per-se, they just need to be high up in the tree, switching large amounts of stuff, eg a complete tile, not one window on the front door of a house :) And OSG LOD nodes can use distance or screen-space pixel metrics, and they update per frame, so you could absolutely increase the visibility, but reduce the detail levels, with increasing altitude; turning off trees, OSM buildings, and then /all/ objects. <ref>https://sourceforge.net/p/flightgear/mailman/message/37129429/</ref> | But there’s no problem with LOD nodes per-se, they just need to be high up in the tree, switching large amounts of stuff, eg a complete tile, not one window on the front door of a house :) And OSG LOD nodes can use distance or screen-space pixel metrics, and they update per frame, so you could absolutely increase the visibility, but reduce the detail levels, with increasing altitude; turning off trees, OSM buildings, and then /all/ objects. <ref>https://sourceforge.net/p/flightgear/mailman/message/37129429/</ref> | ||