[vtkusers] vtkVolumePicker

[David Gobbi]

Hi Richard,

I replicated the "transparent pick" bug you reported, and submitted a fix
for review:
https://gitlab.kitware.com/vtk/vtk/merge_requests/1467

The loop got stuck if the pick reached the camera's far clipping plane
before
either 1) finding an opaque voxel or 2) exiting through the rear of the
volume.

 - David

On Fri, Apr 22, 2016 at 7:25 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> On Fri, Apr 22, 2016 at 7:10 AM, Richard Frank <rickfrank at me.com> wrote:
>
>>
>> I also found an issue where in some cases the Ray trace loop ( in
>> vtkCellPicker ) would get stuck.
>>
>> While ( t1 < tLast ) // something like this
>>
>> Etc
>>
>> In the particular instance, which seemed to be a click on an "empty"
>> transparent area, t1 would get stuck at 1.0 " fore ever"  ...
>>
>> So I subclassed it to work around and if t1 stays a 1.0 +- tiny e for
>> >200 loops I break out.
>>
>
> Thanks for the info, there must be a bug.  I'll take a look at that loop.
>
>  - David
>
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