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

[Thomas Larsen Wessel]

Anyone? :)

So if I had to guess: Prerendering raster outside the viewport is disabled
because for any remote raster source (most are remote) it would overall
require QGIS to download much more raster data than otherwise. For users
with low bandwidth prerendering/predownloading raster outside the viewport
would end up feeling even more sluggish than what I am experiencing. Could
that be the reason?


On Wed, Nov 15, 2023 at 5:40 PM Thomas Larsen Wessel <mrvelle at gmail.com>
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.
>
> Sincerely, Thomas
>
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