Aligning an entity to my verlet construct.

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Techlord

To Gurus who have implemented Thomas Jakobsen's Verlet Integrator Character Physics:

I'm currently searching for the (C2) Sqrt Approximation with respect to particle masses. My code simply does not work:

delta=x2-x1
delta=delta*restlength^2/((dotproduct(delta,delta)*(invmass1+invmass2))+restlength^2)-(invmass1+invmass2) <-- trouble starts here
x1=x1-delta*invmass1
x2=x2+delta*invmass2

Your assistance is valued. thanx