[Qgis-developer] What about OpenGL renderding ?

[A Huarte]

There is also a more ambitious option, detach in QGIS the render of the objects of the painting technology ( Currently Qt+QPainter ) using interfaces as Ogre, Irrlicht or OSG does. 

Then could be implemented several 2D/3D-CPU/GPU renderers ( Qt4-5, OpenGL, OpenGL ES, Ogre, OSG ...) being the rendering mode (2D/3D or CPU/GPU) changeable from a single application option.




>________________________________
> De: kimaidou <kimaidou at gmail.com>
>Para: vincent.ml at oslandia.com 
>CC: qgis-developer <qgis-developer at lists.osgeo.org> 
>Enviado: Jueves 24 de octubre de 2013 11:59
>Asunto: Re: [Qgis-developer] What about OpenGL renderding ?
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>2013/10/24 Vincent Picavet <vincent.ml at oslandia.com>
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>Hello,
>>
>>Le jeudi 24 octobre 2013 09:54:06, kimaidou a écrit :
>>[..]
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>>> In web mapping contexts, major improvements are made in 2D vector rendering
>>> speed by using WebGl technology, such as in upcoming OpenLayers 3. As a
>>> user point of view, improvement seems huge compared to classical DOM or
>>> more advanced CANVAS renderer.
>>>
>>> What about using graphic card to help improve rendering performance in QGIS
>>> ? Would this help a lot, or at the contrary would this be a dead-end ?
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>>We would probably begin with porting QGIS to QT5, as OpenGL support has been
>>added to QT5 and improved in 5.1.
>>See for example :
>>http://qt-project.org/doc/qt-5.0/qtopengl/2dpainting.html
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>>Otherwise, reimplementing an pure OpenGL rendering engine seems a big effort.
>>And we still would want to have a classic renderer for non-accelerated
>>hardware.
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>Thanks for this ressource page about qt5
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>I agree with you : why reinvent the wheel if QT5 proposes needed and mature tools. I just hope porting QGIS to Qt5 won't be so hard that it would postpone it to 3.0 though :) Have any discussions begun on this topic among QGIS devs ?
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>>One really interesting thing is that it would open the door for viewing 3D
>>objects in QGIS. As for now to be able to see PostGIS 3D objects we had to
>>develop our own external 3D viewer (horao). For that to happen we would need
>>real 3D geometry support in QGIS too.
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>Exactly, I have seen your video for Lyon town project, this is great ! I can only imagine what a speed improvement it would bring for "simple" 2D painting ! 
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