[vtkusers] "Filling" parts of a volume that are "inside" a set of polyhedra

[Dean Inglis]

good to know David, thanks!!!

- Dean

On Sun, Jul 23, 2017 at 11:21 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Elvis,
>
> I'd recommend generating a stencil with vtkPolyDataToImageStencil, then
> iterating over over all the voxels inside the stencil with
> vtkImagePointDataIterator:
>
> http://www.vtk.org/doc/nightly/html/classvtkPolyDataToImageStencil.html
> http://www.vtk.org/doc/nightly/html/classvtkImagePointDataIterator.html
>
> The iterator can efficiently give you the pointId for every voxel enclosed
> by the polyhedral surface (works for concave as well as convex surfaces).
> Once you have the pointId, you can set that voxel to whatever you want.
> There's a brief and vaguely relevant description on gitlab:
> https://gitlab.kitware.com/vtk/vtk/merge_requests/1118
>
>  - David
>
>
> On Sun, Jul 23, 2017 at 6:45 PM, Elvis Stansvik <
> elvis.stansvik at orexplore.com> wrote:
>
>> Hi all,
>>
>> I have a set of points describing multiple convex polyhedra. The
>> polyhedra are for the most part disjoint in space, but they may
>> intersect slightly in some places.
>>
>> I need to create an empty voxel volume (all scalars 0), and then
>> "fill" the voxels that are inside one (or several) of the polyhedrons
>> with some Perlin noise. I also have access to normals for the faces
>> constituting the polyhedra, if necessary.
>>
>> Finally, I also have a single separate polyhedron (non-convex this
>> time), and as a finishing step, I'd like to fill the voxels that are
>> inside this polyhedron with a constant scalar value.
>>
>> Can VTK help me here?
>>
>> As this is new territory for me as far as VTK goes, any
>> pointers/advice on how to go about it would be much appreciated.
>>
>> Cheers,
>> Elvis
>>
>
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