Eugene, BTW, the reader does support not merging points. I'll check if ParaView exposes that option, if not, it should. That'll speed this up too.
Utkarsh On Tue, Jul 5, 2016 at 12:04 PM, Utkarsh Ayachit < utkarsh.ayac...@kitware.com> wrote: > Eugene, > > I am pretty sure the community will be interested in this! While I'll need > to look into the reader to understand, to get things going, do you have a > sample dataset to demonstrate the issue? > > Utkarsh > > On Tue, Jul 5, 2016 at 10:28 AM, Eugene de Villiers < > e.devilli...@engys.com> wrote: > >> Hi, >> >> >> >> When importing STL format geometry or similar, where connectivity >> information is not implicit in the data structure, it appears that the >> connectivity is reconstructed via an octree search. This is very >> inefficient when surfaces with large differences in edge length are >> imported – we have had a recent case where an STL took 45mins to load. If >> the same input geometry is converted to OBJ format via an external tool, >> the load time reduces to minutes. >> >> >> >> A generally more efficient method is to calculate the distance of each >> point from a location outside the point cloud bounding box and then to >> bubble-sort the resulting list. Unless you are dealing with a pathological >> case your local search neighbourhood of identical distance points will be >> small and the algorithm very fast. More complex, multi-origin algorithms >> are also possible to counter pathological instances. >> >> >> >> I can provide more details and sample code if you are interested. >> >> >> >> Best regards, >> >> >> >> *Eugene de Villiers* >> >> *Managing Director* >> >> e.devilli...@engys.com >> >> Mob: +44 (0) 77 89748490 >> >> Tel: +44 (0)20 32393041 (ext. 102) >> >> Fax: +44 (0)20 33573123 >> >> [image: logo_red-black_fonts_signature] <http://www.engys.com/> >> >> >> >> This message is intended only for the use of the addressee and may >> contain information that is privileged, confidential and exempt from >> disclosure under applicable law. If the reader of this message is not the >> intended recipient, or the employee or agent responsible for delivering the >> message to the intended recipient, you are hereby notified that any >> dissemination, distribution or copying of this communication is strictly >> prohibited. If you have received this e-mail in error, please notify us >> immediately by return e-mail and delete this e-mail and all attachments >> from your system. >> >> >> >> >> >> _______________________________________________ >> 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 >> >> >
_______________________________________________ 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
