[vtkusers] World Units

[David Gobbi]

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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