[Qgis-developer] Discussion: could Ice be used in Qgis ?

[Julien Michel]

Thank you all for you replies.

Well I agree with all the comments made here : ice lacks a whole lot of 
things to replace Qgis rendering, and switching the rendering backend 
might be a very complex and time consuming task (that is almost the 1st 
thing I told Paolo). Moreover, Ice focuses on being efficient for 
rendering : that means a whole bunch or things are locked within Ice 
code (for instance, Ice takes care of reading data from the hard drive).

Still, if you are getting into pure OpenGl rendering someday, and 
looking for responsive features, Ice can be a good source of 
inspiration. it's not rocket science, just a few things to keep in mind 
(in addition to tile caching and multi-resolution) : let the GPU take 
care of everything it can, including all contrast changes and 
reprojection, and avoid heavy operations (like HDD to RAM or RAM to GPU 
transfert) whenever it is possible.

It looks simple, but took me a while and a few tries with Monteverdi 
previous rendering engines, which were not that good, to come up with 
and combine all these ideas.


Le 22/07/2015 21:26, Tim Sutton a écrit :
> Hi
>
>> On 22 Jul 2015, at 14:52, Paolo Cavallini <cavallini at faunalia.it 
>> <mailto:cavallini at faunalia.it>> wrote:
>>
>> Il 22/07/2015 11:48, Julien Michel ha scritto:
>>> Hi Qgis developers,
>>>
>>> I wrote a small library called Ice which is able to render raster (and
>>
>> Hi all,
>> I have seen ti in action during the recent FOSS4G, and I have been
>> really impressed by its speed and capabilities. I think it would be a
>> grat addition to QGIS, as either a main or alternative renderer.
>
> As nice as the idea is, I think it will be quite a massive undertaking 
> and we would break all the beautiful (ok and ugly) cartography that 
> people have come up with using the rich array of rendering styles that 
> QGIS currently has.  I would also like to see a native OpenGL renderer 
> one day so that we can start to thing about native 3D support. Maybe 
> it would be nice to make a patch that lets you swap between Qt 
> rendering backend and Ice, but honestly its probably a lot of work and 
> may just fade away like the old mapnick renderer did…
>
> Regards
>
> Tim
>
>
>> All the best.
>>
>> -- 
>> Paolo Cavallini - www.faunalia.eu <http://www.faunalia.eu>
>> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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>
> —
>
>
>
>
> Tim Sutton
>
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-- 
Julien MICHEL
CNES - DCT/SI/AP - BPI 1219
18, avenue Edouard Belin
31401 Toulouse Cedex 09 - France
Tel: +33 561 282 894 - Fax: +33 561 283 109

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