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Break wire off geometry if at certain angle


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I'm trying to create an expression in Houdini's Hscript to break the wires off the surface off an object when they reach a certain angle.


so far I have this


for i=0 to $P step 2
    set even = "$i"
    set odd = "$even+1"
    while ($F == 0)
    set vec_normal = "odd.$P - even.$P " # find vector at frame 0
        # echo vec_normal
    while ($F > 0)    
    set vec_moving = "odd.$P - even.$P" # find vector at other frames
        # echo vec_moving
    if (vangle(vec_normal,vec_moving) > 40)
        echo null
        echo even
but it doesn't work...
I was wondering if anyone could help me with this?
Thanks in advance!
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