[vtkusers] Transparency and VTK File

[David E DeMarle]

The vtk file formats just store the data, not the rendering properties of
that data.

To store the rendering properties, you want to look at
exporters. Exporter's exist to save off the scene so that it can be
redisplayed (usually by a different software system like POVRay or
RenderMan). Importers do the reverse.

That said, you can store arbitrary information in the data objects's field
data arrays. These arrays will be stored in the vtk file. Later in your
program look for and inspect the contents of those arrays and set the
rendering properties based on them as you see fit. Similarly you could store
an opacity for every cell and/or point, and use that when you make up a
lookup table..

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109


On Sat, Sep 26, 2009 at 1:13 AM, Arsham Mesbah <arsham at uga.edu> wrote:

> So I asked this question in another E-mail but apparently I didn't state
> this correctly!
> I asked about the transparency of an object and how to make it
> transparent.  Well you can change the object transparency by changing its
> Opacity in vtkProperty class, the issue here is How do you write this to a
> vtk file. Meaning if I read this info again in another machine or using a
> different code, I want it to be read with the transparency which was set to
> it. What data in VTK file represent transparency (if any).
> Is there anyway around this?
>
> --
> Sincerely Yours,
> Arsham Mesbah
> University of Georgia
> Department of Computer Science
> 415 Graduate Studies Research Center
> Athens, GA 30602
> Web: cs.uga.edu/~ars
>
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