> How did you arrive at
>
> #local XD = waveHeight[X+1][Y] - 2*waveHeight[X][Y] + waveHeight[X-1][Y];
>
> According to my calculations,
>
>   (v[x-1] - v[x]) + (v[x] - v[x+1]) =

That should be a "-" in the middle, because you are taking the differential 
of the differential.

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