[ODE] multihreading and ODE

[cesar pachon]

hello! I put a separate thread (timer) for
fixed-stepping ODE, and a Main thread with
update-paint code.. the problem is that periodically
my car (a simple car simulation) vibrates. it quicky
becomes stable, but graphically looks bad. my code is:

 
 timer_func(){
   stepping_ode = true; 
   dWorldQuickStep (dWorldID, fixedstepsize);
   stepping_ode = false;
 }
this method runs a 30 fps. My Update and Paint thread
runs at 120 fps (no constant rate) and I check the
flag:
 update(){
  //calculate actual framerate.. 
  if(!stepping_ode){
    //query ODE and update graphic objects.. pos and
rot.
  }
  paint();
 }
my question is.. is something bad with the flag? do I
need sync also the reading method? If I do that, it
would affect the fixed framerate of ODE stepping
function?
thanks by the help!  


		
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