Re: [K3d-development] [BUG] recursive extrude faces on polyhedron produces RIB code that kills Aqsis.

[Paul G. <aq...@gm...>]

Tim is also correct in that Aqsis should most certainly handle it
gracefully. If someone could send me a RIB that causes the crash I'll look
into beefing up the checking.

Cheers

PaulG

On 7/28/06, Timothy M. Shead <ts...@k-...> wrote:
>
> On Thu, 2006-07-27 at 09:50 +1000, Daniel Matthews wrote:
> > See attached file,
> > The geometry saves and reloads OK, but RIB output from it will crash
> > Aqsis.
> > I was using  k3d-all-in-one-setup-0.5.15.0.exe
> >
> > Question is, is it an Aqsis bug &or a K-3D bad geometry issue?
> > Perhaps the polyhedron generation code is producing some faces that
> > are inside out?
>
> The problem here is with the per-face colors generated by the Polyhedron
> plugin.  The way things work in RenderMan, you have a lot of flexibility
> to "tag" geometry with attributes of various types - colors, scalars,
> strings, normals, matrices, etc.  You do this tagging at many levels:
> per-face, per-vertex, per-edge, etc.  However, you do have to be
> consistent: if you provide (in this case) per-face colors for some
> faces, you must provide them for *all* faces.  Polyhedron is doing that
> fine, but what's happening is that the subsequent ExtrudeFaces modifiers
> aren't assigning per-face colors for the new faces they create.  So the
> RIB output produced by K-3D isn't valid in this case.
>
> The short-term workaround is to use the TagColors modifier with the "tag
> faces" property enabled, to assign colors to all the faces.
>
> I will add some sanity checking in our RIB output to catch this scenario
> and correct it.
>
> Longer-term, it's going to be a bear to fix all of the modifiers that
> aren't generating tags ... doh!  But it'll have to be done.  I will
> postpone it to after 0.6 because there are some other
> performance-related changes to k3d::mesh that will have an impact on the
> work.
>
> Cheers,
> Tim
>
>
>
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-- 
Paul Gregory
http://www.aqsis.org
ICQ: 156088409