My Scene Are static ,body not moving,:o

[allked]

I'v already check the Wiki but it didn't sove my problem,
here is my code:
this is the initalize part:

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static  NewtonWorld*      ntWorld;
   static   NewtonBody* ribidBodyBox;

ntWorld=NewtonCreate(NULL, NULL);

   
     NewtonCollision* collision;

 boxSize=1.0f;
   collision = NewtonCreateBox (ntWorld, boxSize,boxSize ,boxSize , NULL);
   ribidBodyBox=NewtonCreateBody(ntWorld,collision);
   NewtonBodySetUserData(ribidBodyBox,bx);

NewtonBodySetAutoFreeze (ribidBodyBox, 0);

   NewtonWorldUnfreezeBody (ntWorld, ribidBodyBox);

   //NewtonBodySetTransformCallback(
   
   NewtonBodySetForceAndTorqueCallback (ribidBodyBox, PhysicsApplyForceAndTorque);
   
   NewtonReleaseCollision (ntWorld, collision);


the PhysicsApplyForceAndTorque callback

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void  PhysicsApplyForceAndTorque (const NewtonBody* body)
{
   dFloat Ixx;
   dFloat Iyy;
   dFloat Izz;
   dFloat mass;

   NewtonBodyGetMassMatrix (body, &mass, &Ixx, &Iyy, &Izz);
   Vector3 force (0.0f, -mass * 9.8f, 0.0f);
   NewtonBodySetForce (body, &force.y);
   
}

and i already have a NewtonUpdate(ntWorld,a); function added in the code at the drawscene loop,

I use this code to test X,Y,Z Pos
NewtonBodyGetMatrix(ribidBodyBox,&bxMatrix[0][0]);
Vector3 pos(bxMatrix[0][3],bxMatrix[1][3],bxMatrix[2][3]);

after i saw printf list ,the value list are just 0,0,0, what is going on? am i doing something wrong?

[Stucuk]

your not setting the massmatrix so the objects mass will be 0. No mass = no movement.

[allked]

thank you for your reply

OK ,now i add setMassMatrix line in the inalize code ,another problem come out,

the body only affect by this:

float omega[3] = {1.0f, 1.0f, 1.0f};
NewtonBodySetOmega (ribidBodyBox, &omega[0]);

and it will automaticlly stop in a few seconds , what happened ? thanks again,

[allked]

this is so wierd , I was wondering what will cause the NewtonBodySetOmega stop it self after a few seconds, also there is no gravity too

[Stucuk]

Body going outside the worlds bounds? If so it will be frozen.

[agi_shi]

NewtonBodySetAngularDamping() and NewtonBodySetLinearDamping()

By default, angular and linear velocities are slightly damped every step, just use the above functions and pass "0" as the damping parameter.

[allked]

thanks , it rotating without automatic stop, but my scene without gravity ,what is going on ? my callback are here:

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float force[3];
   float mass;
   float inertia[3];
               
   NewtonBodyGetMassMatrix( nBodyBox, &mass, &inertia[0],&inertia[1],&inertia[2] );

   force[0] = 0.0f;
   force[1] = -9.8f * mass;
   force[2] = 0.0f;

   NewtonBodyAddForce( nBodyBox, &force[0] );
   

ive change my world size to

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float min[3];
   float max[3];
   min[0] = -70000.0;min[1] = -70000.0;min[2] = -70000.0;
   max[0] = 70000.0;max[1] = 70000.0;max[2] = 70000.0;
   NewtonSetWorldSize( nWorld, min, max );

it's still no gravity

[allked]

I change NewtonBodyAddForce to NewtonBodySetForce , also with no luck,nomatter how I edit the code ,it just looks like the copy from tutorial01 , no gravity

[allked]

I've Checked the Translate value at the matrix that come out from NewtonBodyGetMatrix() they are always 0,0,0 why is that?

[agi_shi]

How do you call NewtonUpdate()?

[mfdesigner]

you need to implement tranformcallback within which to move the body and its collision object.

[Manawenuz]

Plz, UP
I have the same problem and I still haven't solved it!!!

[JernejL]

Plz, UP
I have the same problem and I still haven't solved it!!!

Please give us information on what problem and how and what you tried to solve it.