setStandardForceCallback dont work,help

i check all my code ,but i cant find what is wrong in my code.

Actually,my code run strangely.After i call

body->setStandardForceCallback();

// set the initial orientation and velocity!
body->setPositionOrientation( pos, camorient );
body->setVelocity( (dir * 500.0) );
//body->setAutoFreeze(0);


the body still stand there. The world->update function run normally,but all callback functions aren't called.

You need to post more code. From that sample everything looks fine. Have you made sure to carefully compare to the samples/demos?

the body is probably outside the limits of the World. it defaults to (-100,-100,-100) to (100,100,100), so if you start your body at (0,500,0), it will not update.

make your world bigger, or move the object inside those limits, and you should be OK.

Sorry for no posting in time,YES, is exact what you say,walaber.
i miss setworldsize.The terrain which i play with is 4000*4000, so it oversteps
the default.now it is ok,thx very much. The body speed is restive,sometimes the body
go through the terrain.