Irrlicht Engine

when clearing the scenemgr i get an error?

having seperate levels, i use thre clear but does that mean everything i had in the scenemanager goes? is there not a way to unload a level only?

making a multiple level game using different .irr files, how can we do this?

using the load irr tutorials we have created our own irr maps, now we created a basic ai where when you are a certain distance from the enemy it chases you in a fly straight animator, however this is very stupid and a slight dodge and they run past you, but they also ghost through the walls of the m...