[Paraview-developers] ParaView and double precision Rendering

[Berk Geveci]

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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