Hi, If you are following the psc list, you've probably seen the thread discussing current shortcomings of ftools ( http://lists.osgeo.org/pipermail/qgis-psc/2015-November/003623.html)
In short, the key issues are: 1. When ftools encounter issues with certain features, warning messages get written to the log but this is largely hidden from users since they would actively have to actively monitor the log. The problematic features are then missing from the results but this is not always obvious. 2. The above issue is more common now (since 2.10) since underlying libraries more often (and correctly so) produce geometry collections as outputs. These geometry collections are not handled well by the current ftools code which is much older. To address these issues, the following suggestions have been made so far: ad issue 1: update fTools to warn users when some features cause problems ad issue 2: quick fix fTools to convert geometry collections to single geometry types For the warnings, there's already a first PR draft https://github.com/qgis/QGIS/pull/2432 which needs to be fleshed out. These fixes/updates would be made available as fTools updates via the plugin installer asap. If you have ideas how to handle this efficiently or have already implemented code that addresses similar issues, let us know. It would be good to have a quick discussion in order to be able to provide improvements fast. Best wishes, Anita
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