Help with moving up hill and falling through ground.

I'm making a game with a sphere world but I'm having trouble making it so the player is always standing with his head outwards from the sphere.

right now I'm doing this:

bod->getPositionOrientation(bodPos, bodOrient);
player->node->lookAt(Ogre::Vector3(0,0,0), Ogre::Node::TS_WORLD, Ogre::Vector3::NEGATIVE_UNIT_Y);
bod->setPositionOrientation( bodPos, player->node->getOrientation());

this works until I try moving up a hill, then my player falls through the ground.

this code is in my force callback btw.

So, I'm thinking I need to use an up vector, but I don't know what to use as an up vector so the players head is always pointing outwards from the sphere.

EDIT- Well I found what to make the up vector:
OgreNewt::BasicJoints::UpVector uv = OgreNewt::BasicJoints::UpVector(world, bod, player->node->getOrientation().y * Ogre::Vector3::UNIT_Y);
But my player is still falling through the ground when I try to go up hill.

Well, I kinda solved it, not exactly how I would want to though.

I was using an ellipsoid for my player body but now I'm using a box and he doesn't fall through the ground now.

if anyone has an idea of how I can get it working with an ellipsoid body feel free to share.

you cant use directly setPositionOrientation for movement. Because creates jumps which do make falling thru the ground. Or going thru objects.

Try PlayerControler joint. I see you are using old newton 1.xx, because OgreNewt::BasicJoints::UpVector is only in old 1.xx and its depriciated. I recommend you switch to newton 2.xx its faster!

Disable standard gravitation force on a body and set it manualy, gravitation direction is from your current position to the center of the sphere/world.
Make upvector joint that changes every time your position changes.

As mentioned already:
After making Body and attaching SceneNode to it do not use this SceneNode to set orientation and position.
Try in getting used to using forces from now on.

Thanks for the quick replies guys. Koirat, do you know the formula I'd use for the upvector? I don't know what I'd set it to without the scene node and the lookat function.

are you using a treecollision for your hill/terrain ? i was having troubles with falling through my terrain treecollision until i started using a heightfield collision instead. to add a heightfield collision to your OgreNewt check out this viewtopic.php?f=4&t=11696

hope it helps

@etsuja:
I do not know how to make this joint from custom joint. I have got it in MogreNewt implemented already.