[Paraview] Suggestion for STL import

[Utkarsh Ayachit]

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.devilliers at 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.devilliers at engys.com
>
> Mob: +44 (0) 77 89748490
>
> Tel: +44 (0)20 32393041 (ext. 102)
>
> Fax: +44 (0)20 33573123
>
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