[vtkusers] vtkVolumePicker

[David Gobbi]

Hi Richard,

You'll have to lay out your methods in a bit more detail... you say that
you need a way "reach all the voxels" in the volume, and I'm trying to wrap
my head around what you mean by this.  Picking transparent voxels is
obviously going to be impossible.  Ditto for picking any voxels that are
surrounded by opaque voxels.  I'm not sure what you man by "small
rows/columns" either... aren't all the rows and columns in the volume the
same size?

 - David


On Thu, Apr 21, 2016 at 3:44 PM, Richard Frank <rickfrank at me.com> wrote:

> Hi,
>
> I'm having trouble reaching all ijk in a volume using the Volume Picker.
>
> The computed ijk returned from the picker is in a few cases incorrect. I
> realize there are rounding issues and such, but I'm trying to pick a single
> voxel and I get back, say, 314,391,454 instead of 313,392,454 - in image
> coordinates, for example.
>
> Most often it is fine - it's just in some cases there are small rows /
> columns that are unreachable. Anyone have any advice on this? I assume it's
> some sort of fractional voxel issue but I need to find a way to reach all
> the voxels. I've tried setting the tolerance but it's unclear if that's
> really the issue....
>
>
> Thanks
>
> Rick
>
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