Hi If you want to try some python, you could make a variant of this (1) to export in parallel (thanks Nyall for most of the key rendering logic there). Note teh complete plugin shown there is not functional yet, and you would need to adapt it to temporal based rendering.
(1) https://github.com/timlinux/QGISAnimationWorkbench/blob/main/animation_workbench.py#L211 Regards Tim On Tue, Feb 22, 2022 at 7:02 PM Richard Duivenvoorde <rdmaili...@duif.net> wrote: > Hi Dolf, > > I hope others can confirm/falsify, but I do not think you can do parallel > painting, as QGIS has just one MapCanvas, and for what I know QGIS first > paints the map on that MapCanvas (given your layers, styles, temporal > filter etc etc), and then 'just' creates an image from that? > But maybe I'm wrong in this. > > Slow (as in Hours?) that would be a huge map or very complex styling, OR a > lot of timesteps/frames? > Also: how does QGIS itself render your map if you step through it using > the temporal controller? Can you maybe set (spatial/temporal) indexes on > your data? > > Regards, > > Richard Duivenvoorde > > On 2/22/22 10:06, Dolf Andringa wrote: > > Hi all, > > > > The temporal animation functionality of QGIS is great. I am currently > playing with it, probably a little out-of-scope, to make a travel animation > on a map. Everything works great, except that at high frame rates and high > resolution, exporting the animation to images is very slow (hours). > > > > I dug into the code a little, and in bool > QgsTemporalUtils::exportAnimation > > I see: > > > > while ( currentFrame < totalFrames ) > > { > > ... > > QPainter p( &img ); > > QgsMapRendererCustomPainterJob job( ms, &p ); > > job.start(); > > job.waitForFinished(); > > ... > > } > > > > Which renders each image in sequence. I am new to QGIS development > specifically, so forgive my ignorance, but could the jobs system be used to > render them in parallel instead? Could this potentially speed up the > process significantly? If this is feasible, I'd gladly make a feature > request, and it also looks like a nice PR I could contribute myself > potentially? I'd love to hear your thoughts. > > Cheers, > > > > Dolf. > > > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > -- ------------------------------------------------------------------------------------------ Tim Sutton Visit http://kartoza.com to find out about open source: * Desktop GIS programming services * Geospatial web development * GIS Training * Consulting Services Tim is a member of the QGIS Project Steering Committee -------------------------------------------------------------------------------------------
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