[ODE] keyframe character animation link to a ragdoll

[Samuel Girardin]

Hi again !

I think I know why ode keep some forces between 2 ragdoll states.
Ode  joint apply some forces to connected body ? I noticed if I
wait during a ragdoll mode, until  the ragdoll is completely freeze.
(motionless)I can perform multiple states changes off course I wait
ech time the ragdoll stop moving...
Is there a way to reset force apply by a joint  ? (if joint apply forces)

thanks !

samuel
www.aaxyz.com

----- Original Message ----- 
From: "Samuel Girardin" <samuel.girardin at wanadoo.fr>
To: "Jon Watte" <hplus-ode at mindcontrol.org>; <ode at q12.org>
Sent: Monday, February 16, 2004 6:27 PM
Subject: Re: [ODE] keyframe character animation link to a ragdoll


> Hi  Jon ,
>
> I don't use dClearForcesAndTorque(). I only  use dSetPosition &
dSetRotation
> to make ode box match up
> the keyframe animation, I don't use any addforce or add torque in the
> simulation. The only force I use is gravity.. I have made some test, and I
> really have the feeling that ode keep something of the last ragdoll state,
> when I switch again to a ragdoll state. I think I have to re initialize
ode
> , but I don't want to destroy all object and rebuild them at each new
> state(ragdoll or keyframe). Is there a method to initialize ode ?
>
> Thanks
>
> ----- Original Message ----- 
> From: "Jon Watte" <hplus-ode at mindcontrol.org>
> To: "Samuel Girardin" <samuel.girardin at wanadoo.fr>; <ode at q12.org>
> Sent: Monday, February 16, 2004 5:29 PM
> Subject: RE: [ODE] keyframe character animation link to a ragdoll
>
>
>
> Did you call dClearForcesAndTorque() on each object when you switched
> between modes? Do you call dSetQuaternion() and dSetPosition() on each
> object to make it match up the keyframe animation, when you switch from
> keyframe to ragdoll? (sounds like you did the second, but I'm not sure)
>
> Cheers,
>
> / h+
>
>
> -----Original Message-----
> From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of
> Samuel Girardin
> Sent: Sunday, February 15, 2004 6:53 PM
> To: ode at q12.org
> Subject: [ODE] keyframe character animation link to a ragdoll
>
>
> Hello ,
>
> I've a problem... I'm working on characters animations & behaviors.
>
> On one side I have a skinned mesh link to a bones skeleton animated
> by keyframe (3dsmax export).
>
> On the other side I have an ODE skeleton generated with the bones'mesh
> parameters(lenght, position ,rotation, etc.).
>
> For the moment, I'm able to play the loop keyframe animation (simple
walk),
> and when I hit a key  I  switch to the ragdoll mode. My character fall
down
> correctly. The transition between  the first  state  to the second is
ok...
>
> Here is the pseudo code I use to deal with the two state
>
> if (a key is hit)
>  (
>  enable ode simulation
>  update bones mesh matrix with the ode skeleton matrix
> ) else
>  (
> enable loop keyframe animation
> update odeskeleton matrix with the mesh bones matrix
> )
>
> That works only well only one time:
> Character walk, I press the key, the character fall, I release the key to
> switch
> to keyframe animation, character walk again, but if I press the key again
it
> seems
> ode keep somewhere the last ragdoll state (position etc...). It's not
> exactly the
> last ragdoll state,  it depends...
>
> So I think  my update for ode skeleton   with the bones mesh works only
the
> first time. If I let my character walk during 1km and I hit a key to
switch
> to
> ragdoll mode, that's work, but  not the second time.
>
> To update ode skeleton I use  :
> body[].setPosition  &  body[].setRotation. I think those changes are not
> update
> by ode. So is there a way to update body pos & rot without compute
> simulation ?
> Like said to ode  : keep for each new frame those changes somewhere in
> memory ,
> you need those value  when you 'll have to do your job ?
>
> Here it is. So if someone understand my problem. I appreciate any help !
>
> samuel
>
> www.aaxyz.com
>
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