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

[Dean Inglis]

HI Elvis,


ITK would probably handle the mesh to image problem solving space
better, but I have had success with a pipeline composed of
myPolyData => vtkPolyDataToImageStencil => vtkImageStencilToImage =>
write_your_own_myWorkOnMaskImageOfPolyDataContents

There are some limits to what vtkPolyDataToImageStencil and do: you may
need to transform your mesh to an x-y-z aligned image space with sufficient
resolution and
have it satisfy certain topological conditions.

- Dean

On Sun, Jul 23, 2017 at 8:45 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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