Hi Toni,
On Thu, 8 Feb 2007, Antonio Bleile wrote:
> I'm playing around with the nurbs in OpenSG.... I copied from the
> testSurfaceRender.cpp example. I create some Nurbs surfaces from a CAD
> model and save the whole scene into a osb. When I try to open the
> resulting osb in VRED (latest dailybuild) I don't see any geometry. But
> when I select all surface nodes I see the correct bounding boxes! It's
> as if the surfaces were transparent/not rendered. This must be a newbie
> bug.... Any suggestions?
Generally the .osb support is somewhat flaky, we played around with the
dirtyMask with Andreas and Dirk but I don't think we came to a final
conclusion regarding .osb yet. :-)
> When I call "surface->forceTessellate()"
>
> I get messages like this:
>
> LOG: 4294967295x4294967295:4
> LOG: Surface::tessellate: inconsistent attributes
>
> That might be the problem, but what does it mean???
it means that the program finds 4 controlpoints but it expects a lot more
which is nonsense, it's probably an underflow as this is stored as UInt32.
Most probably your knotvectors are too short, clamped knotvectors are
expected just like in OpenGL or OpenInventor. If you exported your model
from Maya, that has a wellknown "feature" of supplying two start/end
knotpoints less than anything else, at least versions from a few years ago
did so. :-)
Sorry it's EG deadline so I don't have more time to explain but feel free
to ask me tomorrow or send me your models/testapp and I can take a look
but not today.
HTH,
Akos
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