Hi all, Nobody here ? Every one disconnected for christmas holliday season ?
I am struggling with my simulation game. This is a marble racing game that looks like ode-collision-8-terrain.py tutorial. Actually, if you toggle this turial in wireframe mode, you will see some of my issues (let simulation lasts a while). 1) Slow : The simulation is too slow, as in a planet with low gravity. I noticed ode stepsize = soya round_duration. Effectively, reducing round_duration under 0.005 is better but still not perfect (seems to be less stable). I suspect that visting world during each round (begin, advance, and end) make a latency between ode stepping, and so fluidity/realism of simulation is bounded by this round visiting mechanism. Correct or not ? 2) Jiterring : Looks like the ball is some time "bouncy and dancing", small pops with small linear and angular velocity. Occurs at low energy (when balls are very slow), and frequency of contact is very high. Seems quite random (more "bouncy" when CFM is higher). 3) Violent popping : Can occurs at medium-low energy, when rolling, receiving a very stong vertical impulse (generally angular velocity is low). Other case is terrain collision at medium-high energy when angle with contact normal is in the midle (neither horizontal, nor vertical collision). Tried to fix with "contact_max_correcting_velocity", but doesn't work as I expected... 4) Falling : Some time balls are falling (rare) with no apparent reason. I noticed that when stepsize is longer and whith certain size ratio betwen sphere and terrain surfaces, it is more frequent. => All these are show stopper for my game idea (except 1) that could be Ok). I tried several stability tricks from ode documentation, some seems to work a little, some time i didn't notice any effect (as if ode binding was "silently" broken), but never achieved something really stable. => I don't know how to debug/help, we are in Pyrex and ode binding black magic. => I suspect matrix random computation insatbility (error margin), or Terrain Collider weird integration with ode that could be at the heart of problem, but the code seems to complicated for me. => Could someone help me ? Best Regards Jacques _______________________________________________ Soya-user mailing list Soya-user@gna.org https://mail.gna.org/listinfo/soya-user
