[Marble-devel] Re: Texture quality

[bbeschow at cs.tu-berlin.de]

Hello Helmut,

>> My customer complains about a worsening of the texture quality and I can
>> verify this. If I view the schagen map from a height of 2756.7 km the
>> old
>> version has a much better quality. I can provide screen-dumps if you
>> cannot reproduce this effect.
>
> Yes I can confirm this effect: for a few zoomlevels the point where
> Marble switches between zoomlevels doesn't seem to be optimal.
>
> Bernhard: Could this be related to the latest changes with "sharp"
> discrete mercator display?

I rather think it's related to the following commit, where the tile
selection logic was modified to take the number of base tiles into
account:

https://projects.kde.org/projects/kde/kdeedu/marble/repository/revisions/5504cd4ac761fbb469814db5a65785deb64ad7f9

Meanwhile, the code has moved to TextureLayer::paintGlobe().

> Just a thought: Is it currently possible to "tweak" the zoom level change
> via
> the dgml files?

I currently can't imagine a way to tweak a dgml file. However, it should
be possible to tweak the tile level selection logic to choose a higher
tile level.

Helmut, would that help you?

Greetings,
Bernhard