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Predictive

Started by Soul Jan 24, 2003 at 2:44 PM 1 replies 800+ views

Original Post

Jan 24, 2003 at 2:44 PM

OK as we all know in a MMOG, we can''t send every little change a player can see from the server all the time, so we usually need some kind of predictive engine that predicts what a player will do. Basically I''ve written a predictive engine for a little game I''m working on, and it works quite nicely by assumming that if a player is turning right at a given rate, that player will probably continue to do so until another packet is received (so I basically smooth the motion), this is great apart from when they make a sudden change in direction as my predictive engine carries on until the packet arrives which then says actually I was going the other way !! and I get a little leap as it moves to where it should be. anyone have any clever ideas to get around my little leap?

OmniBrain

Jan 27, 2003 at 9:37 AM

let the renderengine interpolate between the anticipated position and the new position.

say if you have the info your char is looking at angle 0° at time 0, and you know he is turning clockwise, so you anticipate he is at say +10° next update. now your update comes and it says -10°, rotating left!
you anticipate from -10°, get as result you will be at -20° next tick, but you actually represent the character with 10°. what do now?
for the next frames let the character rotate faster counterclockwise, so you will have reached -20° at the time the next update comes.
so next update comes, it says -20°, still rotating counterclockwise. you predict you will be at -30° at next update, you are at -20°, so just turn your char some slower than before.

i hope this is understandable..

Soul

Author

Soul

Jan 27, 2003 at 5:12 PM

Yep that makes perfect sense,
Thanks
Soul.

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