Irrlicht Engine

My experience with ODE:
In ODE it is very difficult to adjust the parameters that the behaviour of your simulation is what you would expect.
As example following parameters.
The gravitation. Values of -0.5 are in tutorials used. Setting it to -9.1 often leads to unstable behaviour. But why should ...

Simply call the clear() method of the SceneManager.
The destructor of the SceneManager or the drop() method of the SceneManager must not be called

To skip from an animation to another, I use setFrameLoop in the interface class IAnimatedMeshSceneNode to set the part of frames for the next animation. This always lead to dangling with jittering of the animation.
The animation is stored in an X-File.
Has anyone experience with this?
Has more to ...

I think in the destructor of the SceneManager (class CSceneManager, the implementation of the interface class ISceneManager) this work is done.
I will try it this way.

How is the correct and safe way in Irrlicht for switching in a game from the first to the second level. In each Level all nodes in the scene (and perhaps the scenemanager) should newly be built.
pScenemanager->clear() ?
delete pSceneManager ?
Or have all nodes to be dropped?

Has anyone some ...

What is the best and cheapiest way for bringing animations into IrrLicht?
The last weeks I tried several ways. But it seems there is no continuos path from a free modeling/animation tool to irrlicht?
Am I right?
The best tool for me is Anim8Or but the AN8 format does Irrlicht not support and in the ...