VTK OpenGL2 uses automatic data normalization (shift/scaling) to handle large data ranges. So each mapper's data is rescaled/shifted to lie within the 0.0 to 1.0 range and the camera matrix is modified to account for this. All that is done in double precision but resulting in floating point data and matrix.
For most earth centric data sets the normalization works well if your detailed data (like of a building) is in a different mapper than your large scale data (model of the earth). I am not sure if this functionality is in the last PV release, but it should be in the nightly version. There are still some gotchas in setting the camera's clipping range (an automatic clipping range that includes the entire earth will be really bad for a detailed model of a building) but the basic support is there. In terms of adding double support it could be done conditionally if the hardware has it then turn it on. We already do that for a couple OpenGL 3.3 features. But I doubt we will require OpenGL 4 any time soon as moving to OpenGL 3.2 was a stretch for many people. Having said that, we do typically get OpenGL 4 contexts on many platforms by default. Hope some of that helps! Ken On Tue, Oct 10, 2017 at 1:56 AM, Lieberwirth, Undine < [email protected]> wrote: > Hello list, > > I am using real (long - more than 7 digits) geographic coordinates in my > project. Unfortunately, with OpenGL 2 they cannot be visualised in > ParaView. I am therefore in need of the implementation of OpenGL 4 (or > higher) in ParaView. Is there already an ongoing project or can we join a > team which is already working on this subject? > Kind regards > Undine > > > ************************************************************ > ************************************************************ > ************************************************************ > **************** > Undine Lieberwirth M.A. > Freie Universität Berlin > Exzellenzcluster Topoi 264 > Forum Spatial Data > Hittorfstr. 18 > 14195 Berlin > Tel. +49 30 838 57275 <+49%2030%2083857275> > Fax +49 838 53770 <+49%208385%203770> > Email: [email protected] > Websites: topoi.org, community.topoi.org/web/forum-sda > > > > > > > > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at http://www.kitware.com/ > opensource/opensource.html > > Please keep messages on-topic and check the ParaView Wiki at: > http://paraview.org/Wiki/ParaView > > Search the list archives at: http://markmail.org/search/?q=ParaView > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/paraview > > -- Ken Martin PhD Distinguished Engineer Kitware Inc. 28 Corporate Drive Clifton Park NY 12065 This communication, including all attachments, contains confidential and legally privileged information, and it is intended only for the use of the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken in reliance on it is prohibited and may be unlawful. If you received this communication in error please notify us immediately and destroy the original message. Thank you.
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