DirectionalForce

[Overhertz]

is there a function or simpler method to addforce in a direction? to call several functions from newton dll so that i can apply force to a body in a direction seems a waste, if there is not, then i guess i'd like to request this function something like

NewtonBodyAddForceDir(NewtonBody, floatforce);

[Julio Jerez]

in the force callback all you nee to do is add the force togethe with the gravity.

if teh force is applyied off teh center of mass then you calculaet the cros product wi the distance form teh center and add that as a torque

look in the FAQ in teh forum for an exlanation.

[Overhertz]

hi thanks for replying, i checked the FAQ section, but i couldn't find any threads related to this topic, and i dont think i quite understand.

[Julio Jerez]

http://newtondynamics.com/forum/viewtopic.php?f=15&t=753

[Overhertz]

well i've tried to implement it as from the thread you linked, but it doesnt seem to work i guess i don't quite get it.. anyways this is what i've done

Code: Select all

  obj := NewtonBodyGetUserData(body);

  NewtonBodyGetMassMatrix(body, @Mass, @Inertia.x, @Inertia.y, @Inertia.z);
  NewtonBodyGetMatrix(body, bodymat.pointer);

  R := obj.modelNode.getBoundingBox.getCenter * IrrToNewton; //will

  bodymat.rotateVect(Torque, getVector3df(obj.vehicleTorque,obj.vehicleTorque,obj.vehicleTorque)*100); //
  bodymat.transformVect(outPoint, R);

  outPoint := outPoint - bodymat.getTranslation^;
  Torque := Torque.crossProduct(outPoint);

  WriteLn(Vector3dToStr(@Torque)); //debug

  //output //maybe torque can be combined with torque ???
  Force := getvector3df(0, Gravity * Mass, 0);
  NewtonBodyAddForce(body, @Force.X);
  NewtonBodyAddTorque(body, @Torque.x);


basically it needs to help force the vehicle in the direction it is headed (obviously) my car works good so far, but is slow, takes its time to get up to speed, so i need momentum and forces i guess.
any ideas