[Paraview-developers] [Paraview] ParaView and double precision Rendering

[David E DeMarle]

Sounds doable and very useful to me.

Conceptually it is simple, use the world space bounding box to rescale the
representations appropriately. You can mock it up at first in python with
the transform filter and/or display transformations.

Let us and especially the pv-developers list know if you run into problems.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Thu, Apr 23, 2015 at 2:41 AM, Lodron, Gerald <Gerald.Lodron at joanneum.at>
wrote:

>  Hi
>
>
>
> Today i got an (maybe stupid) idea:
>
>
>
> The solution of rescaling my double data to get correct viewing is not
> very elegant: All filter/sources settings will be in wrong relation (e.g.
> if I want to insert a sphere of radius 1, or if I want to measure my data
> using ruler, or if I want to watch my data in spreadsheet view)
>
>
>
> Wouldn’t it better to write a “view plugin” where all data firstly is
> rescaled/mean subtracted before sending to 3d polydata mapper? In that case
> all filter settings, ruler and so on will also work like expected. I never
> wrote a view plugin but is this in principle possible? Or should I use a
> “representation plugin” for that.....
>
>
>
> Any suggestions?
>
>
>
> Best regards,
>
> Gerald Lodron
>
>
>
>
>
> *Von:* Berk Geveci [mailto:berk.geveci at kitware.com]
> *Gesendet:* Dienstag, 14. April 2015 18:16
> *An:* Lodron, Gerald
> *Cc:* Paraview User (paraview at paraview.org); Paraview Developer (
> Paraview-developers at paraview.org)
> *Betreff:* Re: [Paraview-developers] ParaView and double precision
> Rendering
>
>
>
> OpenGL does not support double precision. VTK does not do anything special
> in handling large coordinates and passes them to OpenGL directly. So
> currently, you have to handle this yourself by rescaling your data.
>
>
>
> Best,
>
> -berk
>
>
>
> On Mon, Apr 13, 2015 at 1:25 PM, Lodron, Gerald <Gerald.Lodron at joanneum.at>
> wrote:
>
> Hello
>
> I made a paraview reader plugin which loads Point data of type double from
> an ASCII file (can be choosen as checkbox in reader parameter gui). It is
> important that point data type is double since our values have a huge
> offset, e.g.
>
> Coordinate in float:      3376382.75    -325198.59375   -121298.125
> Coordinate in double: 3376382.849028525874      -325198.60899497801438
> -121298.12806414699298
> (same ASCII input file of type double, above printings come from
> spreadsheet view so loading is correct)
> (all my points have such small changes, I definitely can see those small
> changes in 3d)
>
> The problem is: I load the dataset once in float and once in double ( I
> checked result in spreadsheed view) I cannot see any differences in 3d
> renderer when I swap visibility of float and double input (but you can see
> in spreadsheet). Is the double precision rendering not correct/not
> supported?
> Any ideas?
>
> Best regards,
>
> Gerald Lodron
> Machine Vision Applications
> DIGITAL - Institute for Information and Communication Technologies
>
> JOANNEUM RESEARCH Forschungsgesellschaft mbH
> Steyrergasse 17, 8010 Graz, AUSTRIA
>
> phone:  +43-316-876-1751
> fax: +43-316-876-1751
> web:    http://www.joanneum.at/digital
> e-mail: gerald.lodron at joanneum.at
>
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