3d move (Irrlicht)

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Diablo

been trying to get Irrlicht 3de egine to work like blitz 3ds for about 2 days and got fairly far. (most impressive feature: IMouseClick(button:int))

now i'm stuck on a, should be, simple problem, i can't get an 'actor' to move 'forwed' or 'strafft' correctly.

the function goes somthing like this:

method IMove(x:int, y:int, z:int)
     kvector3d = knodehandle.getposition()
     xx = kvetcor3d.getx()
     yy = kvector3d.gety()
     zz = kvector3d.getz()
     kvector3d = knodehandle.getrotation()
     pp = kvector3d.getx()
     yy = kvector3d.gety()
     rr = kvector3d.getz()

    ' x (strafft)
    ' y ('up')
    ' z (forwed)
    xx:+ cos(yy) * z
    yy:- sin(yy) * z
    zz:- sin(yy) * z

    knewpos = createvector3d(xx, yy, zz)
    setposition(knewpos)
end method

the code is above is rubbish but i'm at college and didn't bring the actual code. but the problem is i can't think how to make the 'entity' move Relative to its rotation.

thx for any help.