"Warp" wrote:
>   It depends on what you want to achieve. If you want
> them to form a completely contiguous smooth surface,
> then those points should be co-planar (ie. lay on the
> same plane)

No, I think it's enough that the three rows are co-linear and the three
columns are co-linear. All nine points don't have to be co-planar.

> and the points which I marked with numbers should be
> co-linear (ie. lay in the same line, ie. points with
> the same number should lay in the same line).

True.

Rune
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