Hi there,
I'm using the OSGSurface class to render nurbs surfaces.
I started with the surface example and everything works well.
What I want to do is to acces the generated geometry (vertices).
Which should'nt be a problem since the surface is derived from geometry.
So I check if my surface node is derived from geometry, if this is the
case I downcast it to a geometryptr and try to get for example the
geopositions.
Unfortunately doing it that way, the system throws an exception when I
want to acces any member of the gepositions, for example
geopos->size()
Is this the wrong way to access the geomtery, shouldn't be the case
cause surface is derived from geometry?
How doing it right?
Thanks a lot
Sebastian
Here is a codesnippet, that I took from the surface example and modified.
_____
beginEditCP(surface);
{
// set up dimensions and knot vectors:
surface->setDimU( dimU );
surface->setDimV( dimV );
surface->getKnotsU().clear();
for (i = 0; i < numknotsU; ++i)
{
surface->getKnotsU().push_back(knotsU[i]);
}
surface->getKnotsV().clear();
for (i = 0; i < numknotsV; ++i)
{
surface->getKnotsV().push_back(knotsV[i]);
}
// set control points
surface->setControlPoints(cps);
// set error
surface->setError(g_error);
// and finally set the material
surface->setMaterial(mat);
GeometryPtr geo = NullFC;
if ( surface != NullFC &&
surface->getType().isDerivedFrom(Geometry::getClassType()) )
{
geo = GeometryPtr::dcast(surface);
GeoPositionsPtr pcl_points = geo->getPositions();
--> exception is thrown when trying to acces a member of
GeoPositions
std::cerr << " points size: " << pcl_points->size() <<
std::endl;
}
}
endEditCP(surface);
_____
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