[Qgis-psc] 2019 grant report: Fix problems in larger 3D scenes

[Anita Graser]

Hi Tim,

I've already collected all the info: https://github.com/qgis/PSC/issues/21

Your help with writing the blog post would be much appreciated.

Regards,
Anita



On Sat, Jan 25, 2020 at 2:02 PM Tim Sutton <tim at kartoza.com> wrote:

> Thank you so much for this Martin!
>
> Anita maybe we can assemble the other grant reports and put them on the
> blog? Happy to help with that....
>
> Regards
>
> Tim
>
> A sexta, 17 de jan de 2020, 11:45, Martin Dobias <wonder.sk at gmail.com>
> escreveu:
>
>> Hi all
>>
>> I am pleased to announce that my 2019 grant proposal "Fix problems in
>> larger 3D scenes" has been finally implemented and merged in time for
>> 3.12 release.
>>
>> To summarize the work, the focus was on two issues within 3D map
>> views. The first one was that map tiles were only being prepared using
>> a single CPU core - this is now fixed and we may use multiple CPUs to
>> load tiles of 3D scenes faster. The other (and greater) problem was
>> that data from vector layers (when they have 3D renderer assigned)
>> were all being prepared at once for the whole layer in the main
>> thread. That resulted in possibly long freeze of the whole user
>> interface while data were being loaded. This is now resolved as well
>> and data from vector layers are being loaded in smaller tiles in
>> background threads (and using multiple CPU cores). As a result, the
>> overall user experience is now much  smoother.
>>
>> Many thanks for supporting this proposal and also big thanks to
>> everyone who helped with reviews, testing and provided feedback. I
>> believe this is one of the things that take us from the point where 3D
>> map view is just a toy that works with small scenes to the point where
>> the 3D view may be used for serious work with larger amounts of data.
>>
>> Relevant pull requests:
>> - https://github.com/qgis/QGIS/pull/32737
>> - https://github.com/qgis/QGIS/pull/33480
>>
>> Regards
>> Martin
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