@Srod : You're probably right.
I'm not the author of the .lib files I'm working to integrate in PureBASIC ... but with:
MyInteger.l = RotateObject( ObjectID.l, FX.f, FY.f, FZ.f )
MyFloat.f = PeekF( @MyInteger )
it working fine.
As I've done a small program to get the functions names an create the ...