I want to rotate the mesh before attaching it to a Body

Hello,
Here is my problem: I´m loading a .mesh file, but it is not correct. I need to rotate it.

So Im trying:


ent = pSceneManager->createEntity(entityname, meshfilename);
pSceneNode = pSceneManager->getRootSceneNode()->createChildSceneNode(nodename);
pSceneNode->setScale(scale);
pSceneNode->pitch(Ogre::Radian(PI/2), Ogre::Node::TransformSpace::TS_LOCAL);

conv = new OgreNewt::CollisionPrimitives::ConvexHull(pWorld, pSceneNode, pSceneNode->getOrientation(); pSceneNode->getPosition());

pBody = new OgreNewt::Body(pWorld, conv);
...


but it does not work. The mesh do rotate, but the newton body still holds the old orientation.

I also tried:


ent = pSceneManager->createEntity(entityname, meshfilename);
pSceneNode = pSceneManager->getRootSceneNode()->createChildSceneNode(nodename);
pSceneNode->setScale(scale);

Ogre::Quaternation orientbox(Vector3(0,-1,0), Vector3(1,0,0), Vector3(0,0,1));
orientbox.FromAngleAxis(Radian(Degree(-90)), Vector3(1,0,0);
pSceneNode->setOrientation(orientbox);

conv = new OgreNewt::CollisionPrimitives::ConvexHull(pWorld, pSceneNode, pSceneNode->getOrientation(); pSceneNode->getPosition());

pBody = new OgreNewt::Body(pWorld, conv);
...



But I still have the same problem.

Could someone tell me what I´m doing wrong?


Thanks!

How about setting it up without any rotation first (create the entity, attach to SceneNode, create body/collision data, attach body) and THEN rotate to your desired angle? That way there's only one rotation taking place.

But why doesn´t it work?

Because it will be easier for me if I rotate the mesh first, because I´ll have first a class for creating the mesh.
If I rotate it after the attachment, the code will get very dirty.

Best guess is that it's rotating too far because (if memory serves) when you attach the Body to the node, it assumes it's rotation -

conv = new OgreNewt::CollisionPrimitives::ConvexHull(pWorld, pSceneNode, pSceneNode->getOrientation(); pSceneNode->getPosition());

There, skip pSceneNode->getOrientation(); and use Quaternion::IDENTITY (pretty sure that's the correct one.) That way it's not rotating the node AND the body - this way the body assumes the node's rotation only and doesn't spin past the position you want.

Give it a shot at least - I'm 99% sure this should work. I have some extra hard drive space now so I can download all the Newton/OgreNewt files and build it and test tomorrow if you still have issues.

Hey,
thank you. That did work, but now all my movement functions are weird.

The code is like this now:


pSceneNode = pSceneManager->getRootSceneNode()->createChildSceneNode(nodename);
pSceneNode->setScale(scale);
pSceneNode->attachObject(ent);

Ogre::Quaternion orientbox(Ogre::Vector3(1,0,0),Ogre::Vector3(0,1,0), Ogre::Vector3(0,0,1));
orientbox.FromAngleAxis(Ogre::Radian(Ogre::Degree(90)), Ogre::Vector3(1,0,0));
orientbox.normalise();
pSceneNode->setOrientation(orientbox);

//Now create the newton body
conv = new OgreNewt::CollisionPrimitives::ConvexHull(pWorld, pSceneNode, Ogre::Quaternion::IDENTITY /*pSceneNode->getOrientation()*/, pSceneNode->getPosition());
pBody= new OgreNewt::Body(pWorld, conv);
pBody->setMaterialGroupID(pMatCollision->getMaterialID(this->Material));

pBody->attachToNode( pSceneNode );
pBody->setPositionOrientation( pos, pSceneNode->getOrientation() );
pBody->setUserData(this);
pBody->setAutoFreeze(0);

this->setStateToFloating();


//Now calculate the Intertial
conv->calculateInertialMatrix(inertia, offset);
//We dont need conv anymore
delete conv;
//Set the mass matix
pBody->setMassMatrix(mass, inertia);
//Set force callback
pBody->setCustomForceAndTorqueCallback(CCharacter::playerForceandTorqueCallback);




And for movement, I have this function (for moving forward):


int CCharacter::MoveForward()
{
Vector3 globalFaceVec = this->getSceneNode()->getOrientation() * Ogre::Vector3::NEGATIVE_UNIT_Z;
globalFaceVec.y = 0.0f;
globalFaceVec.normalise();
movement = globalFaceVec * SpeedMove;
return 1;
}


And for spinning:


int CCharacter::SpinLeft()
{
this->spin.y = SpeedSpin;
return 1;
}



And the callback is basically:

Ogre::Vector3 force(0,GRAVITY,0);
force += player->getMovement();
force *= player->getMass();

me->addTorque( player->getSpin());
me->addForce( force );


The spinning is ok, but when I press it to move forward, it does not move in a straight direction. Depending on the angle, it moves really forward (from the mesh´s view point), sometimes to the left, sometimes to the right and so.

It was working fine before.

Do you know what happened?

Thanks!