Re: [Soya-user] Character control ODE features

[Souvarine]

What I am wondering is how will you make your character move ? By applying forces directly on the body ? Is it possible to get smooth moves with this system as if the character was walking ? I guess it is possible if you set a very little mass for your body to avoid inertia side effect. This is interesting. I hope you will complete the amotor implementation and make a test program for your system. I want to see this :) Souvarine. Zoltán Döme wrote: Well, maintaining an upright orientation for an object in ODE is *very* easy with an angular motor (BTW the AngularMotor wrapper class is incomplete, as it misses parameter setting functions, and has a negated condition in nb_axes.__set__). Basically this should make a body maintain a constant orientation without strange side-effects: motor = soya.AngularMotor( body ) # euler mode motor.mode = 1 # this is buggy in codebase motor.nb_axes = 3 motor.setAxis( 0, Vector(body, 1,0,0) ) motor.setAxis( 1, Vector(body, 0,1,0) ) motor.setAxis( 2, Vector(body, 0,0,1) ) motor.setAngle(0, 0.0) motor.setAngle(1, 0.0) motor.setAngle(2, 0.0) motor.lo_stop = motor.hi_stop = 0.0 # these are missing from AngularMotor, but are trivial to implement motor.lo_stop2 = motor.hi_stop2 = 0.0 motor.lo_stop3 = motor.hi_stop3 = 0.0 The second problem is rather tricky, but it can be solved pretty well, by using a ray for feet, which also acts as a dampened spring -- the ODE list has some ideas/examples for this. Sure, this is not very easy, but it has the advantage of having correct collision/force response throughout the world, including controlled avatars too. And the CPU-cost part can be greatly reduced by enabling auto-disabling of bodies, and having them enabled when the position is invalidated, or when something collides with them. By the way this makes simulations a lot more stable too. Well, this can all be done outside the engine, except for the broken AngularMotor class, which has to be finished. -- Zoltan Dome On 9/22/07, Souvarine <[EMAIL PROTECTED]> wrote: There is some interesting discussions on the ODE mailing list about how to do this. There is also a little game aviable where the programmer tried to do this. From what I've read on the mailing list and in the comments of that game the result is not very good. There were two main problems with this : - first how to make a caped cylinder geom stay upright - second how to make the body move smoothly as if the character was walking I think that another problem is that ODE is rather CPU costly. I don't think it is possible to manage many characters with this system at the same time. Still, it is not because something could not be done before that it can not be done now. Souvarine. _______________________________________________ Soya-user mailing list Soya-user@gna.org https://mail.gna.org/listinfo/soya-user

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