> ----- Original Message ----
> From: Carl Worth <
cworth@...>
> To: Stuart Axon <
stuaxo2@...>
> Cc:
cairo@...
> Sent: Tuesday, October 14, 2008 6:21:36 PM
> Subject: Re: [cairo] Backend using subdivisional surfaces?
>
> On Mon, 2008-10-06 at 17:59 -0700, Stuart Axon wrote:
> > Hi,
> > I filed bug #17733 asking for a blender uni-verse backend. I've been looking at verse a bit more and it's base primitive is subdivisional surfaces.
> > Forgetting about the verse part for a moment; how difficult would it be to make a backend that rendered to subdivisional surfaces?
> > Are there any artefacts that could occur in such a conversion?
>
> Hi Stuart,
>
> Could you describe in more detail what you mean here by a subdivisional
> surface?
>
> Perhaps one way you could make that very concrete would be to propose a
> new cairo_subdivisional_surface_create function. What would the
> declaration of such a function be?
>
> -Carl
Hi Carl,
I'm going to have more of a look into this and get back to you when I have
more details (I'm really learning about verse and cairo (and a lot of other
technologies) all at the same time (slowly!)).
I'm not sure about the function definition as I have to get to know cairo a bit
more (but I will look into this).
I've posted the email I got on the verse mailing list which has some info to
start with.
There isn't much info here, but I'm forwarding the mail now so I don't forget
that it's there :)
- Hopefully I can learn more cairo and verse and get back with more useful
information in future.
S++
:Mail from verse mailing list follows:
> On Thu, Oct 16, 2008 at 4:07 PM, Stuart Axon <
stuaxo2@...> wrote:
> > Is this the same thing used in verse?
http://en.wikipedia.org/wiki/Subdivision_surface>
> They're close, but not the full story. :|
>
> I'm not aware of a good reference-type description of Verse's
> subdivision surfaces, which is kind of silly. Perhaps Eskil has one?
>
> Catmull-Clark surfaces don't have *creasing* support, which is in
> Verse. With creases, you can express how smooth each corner and edge,
> which means you are not limited to all-rounded objects.
>
> I assume you've alread read the relevant part of the spec, here
> <
http://verse.blender.org/fileadmin/verse/spec/n-geometry.html>, for
> (slightly) more on creasing.
>
> This is a very unsatisfying answer, I know. Sorry.
>
> Regards,
>
> /Emil
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>
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