[Qgis-developer] Create memory layer containing only features visible in current canvas extent

[Tom Chadwin]

Many thanks, Matthias and Martin - I got it working exactly as you suggested.
Is this the mechanism which QGIS itself uses to determine which features are
in the viewport?

I'm running into some performance issue which I thought this would help, but
they are not solved yet, so I might soon have a more general question about
identifying bottlenecks in PyQGIS code.

Tom



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