[Papervision3D] Somes questions for advanced users of PV3D

[rens]

Hello,

So i've got 3 questions, for advanced users of PV3D :

1/ I'm searching about how to make a "walkaround" navigation, (like fps game
but no jump/no crouch, and no blood ^^) .

My question is how to create collisions between my avatar (the camera) and
the walls/ground ?

Do i have to use physics engine ? can i specify a "collision radius" ? 

( i want to specify if i can get close to 0.1m or 15m of the wall ) .


/2 Is this possib to drag a element from a 2d menu (over the 3d scene) and
drop, into the 3D scene, the 3D equivalent of the 2d element (which can be
allready preloaded or not, no matter), and then loading/adding this 3D
object at the mouse projection point (via ray casting / mouse3D ?) . 

I hope this is clear enough :/ 

/3 is this possible to mouse-interact with imported DAE scene and/or his
child/mesh ? 
Seem that "InteractiveScene3DEvent" does'nt work, the only way i've get
interaction is by listening event on viewport3D, but objects get names like
"instancexxx" which are always differents each time i'm compiling a projects
;(

Is there a trick for this ?

Sorry for the questions-flood ^^ (and for my poor english too ...)
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