[Qgis-user] Canvas larger than viewport is rendered/drawn for vector layers, but not for raster layers

[Thomas Larsen Wessel]

Thanks :) I am looking forward to testing that new feature out :)

On Mon, Dec 11, 2023 at 10:47 AM Nyall Dawson <nyall.dawson at gmail.com>
wrote:

>
>
> On Thu, 16 Nov 2023, 2:40 am Thomas Larsen Wessel via QGIS-User, <
> qgis-user at lists.osgeo.org> wrote:
>
>> This screen capture demonstrates much better than words:
>> https://imgur.com/5LSEsiY.
>>
>> Is there any way I can make it prerender the raster data as well?
>>
>> What I have already tried:
>> * setting almost infinite cache size
>> * all the relevant QGIS options/settings I could find
>> * both local (gpkg) and remote WMS raster data
>> * both Windows and Linux
>> * QGIS 3.22 and 3.30
>> * different CRS for layer
>>
>> Some of my tests did make the rendering speed up, but no matter what it
>> always renders the raster data only for the canvas inside the view port,
>> and does not render anything outside of the view port, whereas vector data
>> is always rendered for an area that extends outside the view port.
>>
>
> There's a few parts to the logic defining whether a layer will be included
> in the outside-visible-extent preview:
>
> - WMS layers are **never** included. This is by design, to reduce
> unnecessary server load
> - when a layer is drawn the time taken to render it is recorded. If this
> time exceeds a certain threshold, then the layer is marked as too expensive
> to render in these optional out-of-canvas areas.
>
> (You can check the new renderer profile option available in the F12
> debugging tools panel in 3.34 for more detailed information about layer
> render times)
>
> Nyall
>
>
>
>> Sincerely, Thomas
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