[vtkusers] World Units

[Jean-Christophe Fillion-Robin]

Hi Matt,

Units are intended to be used to describe the quantity of a given object.
Units should help the application to be smarter about how the user can
access/view/interact with the data. For example, units help the user by
displaying the current unit in spinboxes as a suffix (1.3mm instead of
1.3).

For more details, see here
<https://www.slicer.org/wiki/Documentation/Nightly/Developers/Units>

Jc

On Wed, Nov 21, 2018 at 9:28 AM Matthew Troke <
matthew.troke at avalonholographics.com> wrote:

> Could you elaborate a little more on support for units in Slicer? What do
> you mean by "built-in"?
>
> Matt
>
> On Tue, Nov 20, 2018 at 10:41 PM Jean-Christophe Fillion-Robin <
> jcfr at kitware.com> wrote:
>
>> Hi Gavin,
>>
>> If you are working with medical data, you could look at 3D slicer (
>> https://slicer.org), it leverages VTK and ITK and also has the notion of
>> units built-in.
>>
>> Hth
>> Jc
>>
>> On Tue, Nov 20, 2018, 9:13 AM David Gobbi <david.gobbi at gmail.com wrote:
>>
>>> Hi Gavin,
>>>
>>> Using mm for medical image data (with the exception of microscopy) is
>>> the most common choice.  I certainly wouldn't recommend using anything
>>> else.  I've also noticed the need to tweak volume rendering depending on
>>> resolution.
>>>
>>>   David
>>>
>>>
>>> On Tue, Nov 20, 2018 at 8:00 AM Wheeler, Gavin via vtkusers <
>>> vtkusers at public.kitware.com> wrote:
>>>
>>>> We’ve not been using OpenVR directly, but have been using it indirectly
>>>> with medical data. We ended up using m as the real world units, and then
>>>> scaling loaded medical data by a factor of 1000 to convert from the
>>>> commonly used mm, to m. This has worked well, but there are the odd gotchas
>>>> when doing this– watch out for things like volume rendering step size which
>>>> you may also need to scale.
>>>>
>>>>
>>>>
>>>> Gavin Wheeler
>>>>
>>>>
>>>>
>>>> *From:* vtkusers <vtkusers-bounces at public.kitware.com> *On Behalf Of *Ken
>>>> Martin
>>>> *Sent:* 19 November 2018 16:22
>>>> *To:* Dave Demarle <dave.demarle at kitware.com>
>>>> *Cc:* vtkusers at public.kitware.com
>>>> *Subject:* Re: [vtkusers] World Units
>>>>
>>>>
>>>>
>>>> Although the OpenVR module does use the notion of a physical to world
>>>> transformation to map between meters in the VR room and the world
>>>> coordinates.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, Nov 19, 2018 at 9:57 AM David E DeMarle <
>>>> dave.demarle at kitware.com> wrote:
>>>>
>>>> vtk itself is unitless. it is up to the application to keep track of
>>>> that.
>>>>
>>>>
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> Principal Engineer
>>>> 21 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-881-4909
>>>>
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>
> --
> Matthew Troke
> Software Engineer
> Office: 1-709-701-0239
> Email: matthew.troke at avalonholographics.com
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