Warp <war### [at] tagpovrayorg> wrote:
> clipka <nomail@nomail> wrote:
> > It's fundamentally impossible to do that.
>
> > To compute a tangent to an arbitrary curve defined as f(t) (the value of which
> > in this case is a vector), you need the derivative f'(t) of that function,
>
>   I find those two sentences contradictory. First you say that it's
> impossible, and immediately after you tell how it's done.

There's no contradiction in those two sentences unless you erroneously assume
"it" to be a forward reference (which is a very uncommon syntax in English
language :P) to "to compute a tangent..." while in fact it is a reference to
getting the macro to work with 0 as a parameter.

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