Re: [Algorithms] C1 vs G1 (Was: "N-Patches")

[Lorenzo P. <lp...@ti...>]

> >> I don't thing there is any meaning of "G0".
> >For two segment curves it means they join together, G0 is "geometric
> >continuity".
> >If directions (but non necessarily the magnitudes)  of the two segments'
> >tangent vectors are equal at joing point, the curve has G1.
> >For more details check out Foley Van-dam. 480-483
>
> Are you sure? That is saying that G0 == C0, which makes me slightly
> uncomfortable given than Gn!=Cn for n>0.

I'm sure that Gn!=Cn for n>1 ... but I'm confused about C0 and G0.
did you check the reference ? there's another from "Curves and surfaces for
computer aided geometric design" Farin's one. page 183

Geometric continuity:
"A curve is said to be Gr if there exists a regular reparametrization after
which it is Cr"
So what about C0 and G0 ?

TIA,
    Lorenzo Pallara