[vtkusers] Using vtkDiskSource/vtkLinearExtrusionFilter with vtkCubeSource - how to create the hole through the cube?

[Sid Murthy]

Thanks for the help - I'll give both a try. Maybe write up an example if I
have time.

-Sid

On Fri, Sep 19, 2014 at 8:04 PM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> If you want a box with a hole through it, you could also try the
> vtkBooleanOperationPolyDataFilter with the first input set to the
> output of a vtkCubeSource and the second input set to a
> vtkCylinderSource where the cylinder ends lie somewhat outside the
> cube bounds. Set the operation to difference and you should get a cube
> with a hole through it.
>
> See
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/BooleanOperationPolyDataFilter
> for an example.
>
> There are some cases on which the vtkBooleanOperationPolyDataFilter
> fails, but this application sounds simple enough that it should work.
>
> Cory
>
> On Fri, Sep 19, 2014 at 5:41 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> > So you want to have a cube with a cylindrical hole that goes all the
> > way through it?  It's not easy, but it's possible.
> >
> > First, you'll want to reverse the sense of your pipe, so that the
> > faces face inwards.  This can be done with vtkReverseSense.
> >
> > Next, append it to your cube with vtkAppendPolyData.
> >
> > The third step is the tricky one: you have to re-build the faces of
> > this combined polydata so that the faces form a single closed surface
> > (i.e. instead of forming one surface for the cube and another separate
> > surface for the pipe).  This can be done with vtkClipClosedSurface,
> > because it can clip away the old, unconnected surfaces and build new
> > surfaces that connect the outside of the box with the inside of the
> > pipe.
> >
> > I don't have an example that does this, but you can look at the
> > wiki page http://www.vtk.org/Wiki/VTK/Closed_Surface_Clipping
> > for hints.  Basically, if you clip away the original cube faces (by
> > setting clipping planes that are just inside of the original faces),
> > you can get vtkClipClosedSurface to create new faces with good
> > connectivity between the cube and the pipe.
> >
> > Note that I didn't say it will be easy... I just said it will be
> possible.
> >
> >  - David
> >
> >
> >
> > On Fri, Sep 19, 2014 at 3:17 PM, Sid Murthy <sid.murthy at gmail.com>
> wrote:
> >> Hi -
> >>
> >>   I am using a vtkDiskSource and vtkLinearExtrusionFilter to create a
> pipe
> >> (with a hole). I'd like to put this pipe through a cube (vtkCubeSource)
> and
> >> still retain the hole in the middle. Is this possible - somehow - with
> >> vtkcutter or vtkclippolydata?
> >>
> >>
> >> Thanks,
> >> Sid
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