Re: [Nuke-users] XY_KNOBS (sorry for being persistent)

[chris]

not sure what exactly you're trying to do, but this gives the Y 
difference between the two points. note that the integerKnob 
will round the result to the nearest integer, so you might want 
to change that if you need more accuracy. also note that you 
don't need to import the math module.

def conversion():
    #setCamera Parameters
    st = nuke.nodes.NoOp(name='LE RULERo')
    IS = nuke.Int_Knob("yResult", "RESULT_PIXEL")
    CV1 = nuke.XY_Knob("right_pos", "RIGHTPOS")
    CV2 = nuke.XY_Knob("left_pos", "LEFTPOS")
    st.addKnob(IS)
    st.addKnob(CV1)
    st.addKnob(CV2)
    CV1.setValue(1132, 0)
    CV1.setValue(546, 1)
    CV2.setValue(1356, 0)
    CV2.setValue(546, 1)
    IS.setExpression("[value right_pos.1] - [value left_pos.1]")

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