[vtkusers] World Units

[Jean-Christophe Fillion-Robin]

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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