[vtkusers] Using vtkDiskSource/vtkLinearExtrusionFilter with vtkCubeSource - how to create the hole through the cube?
cory.quammen at kitware.com
Fri Sep 19 22:04:14 EDT 2014
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.
for an example.
There are some cases on which the vtkBooleanOperationPolyDataFilter
fails, but this application sounds simple enough that it should work.
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
> 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?
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