Thanks Sebastiaan for raising this point. It's clear that if (SF)CGAL was somehow introduced inside the core it would need maintanance.
Nyall, I agree with you. CGAL shouldn't overlap GEOS, even if its robustness (infinite precision) can make the difference. The real benefits would arise if/when QGIS will want to widen its SQL/MM geometries. TINs, polyhedral surfaces, or simply 3D predicates considering the z coordinate in 2.5D geoms. I fear GEOS will hardly expand to 3D, therefore CGAL could be the right candidate to fill the missing parts. Giovanni Il 12 mar 2017 00:07, "Sebastiaan Couwenberg" <[email protected]> ha scritto: > On 03/11/2017 04:26 AM, Nyall Dawson wrote: > > Instead, a better approach is if we selectively change certain > > operations to use a different backend only after we carefully evaluate > > the results for each individual operation concerned. E.g. if we found > > that SFCGAL resulted in intersections which are equally reliable as > > GEOS, and faster in the majority of geometries, then we'd change > > QgsGeometry::intersection to ALWAYS use SFCGAL. > > SFCGAL is not very actively developed, in its current shape is not the > best choice to build upon. It either needs more active participation > from the community, or better funding. Since the initial funding dried > up, the activity in the project slowed to a crawl. > > I'm considering removing the SFCGAL support in the PostGIS Debian > package if the situation doesn't improve. For the same reasons I'd be > reluctant to enable its support in QGIS if that were to arrive. > > Kind Regards, > > Bas > > -- > GPG Key ID: 4096R/6750F10AE88D4AF1 > Fingerprint: 8182 DE41 7056 408D 6146 50D1 6750 F10A E88D 4AF1 > _______________________________________________ > Qgis-developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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