[Interest] Rendering simple QPainterPath with Qt3D

[Sean Harmer]

On Tuesday 15 Mar 2016 17:41:07 Ch'Gans wrote:
> On 14 March 2016 at 22:03, Sean Harmer <sean.harmer at kdab.com> wrote:
> > On Monday 14 Mar 2016 16:50:32 Ch'Gans wrote:
> >> 
> >> Could anyone shed some light on how I could achieve this, like is the
> >> custom QMEsh/Geometry the right approach for this kind of problems?
> > 
> > If you want to extrude, then yes you need actual geometry so investigating
> > QGeometry is the way to go. Basically, you provide a QBuffer containing
> > your per-vertex data (positions, but maybe also normal vectors if you
> > want lighting, texture coordinates if you want to apply a texture, vertex
> > colors if you want to use the per-vertex colour material etc).
> > 
> > You then define one or more QAttributes that correspond to these
> > per-vertex
> > attributes. The QAttributes describe the layout of the data in the
> > QBuffer.
> > 
> > You can then specify the QGeometry that contains the attributes in a
> > QGeometryRenderer component.
> 
> Wow!!!
> Thanks for this explanation, it sounds so easy said this way! ;)
> 
> I saw this QAttribute thing, but didn't bother digging further. But
> now I have a better picture on how all this works.
> Again, thanks a lot for your enlightening comments.
> 
> Maybe it would be nice to have a cpp example that show this. That was
> my blocker as I went through all the examples, there's the case where
> you load your model from a file, there's an example where you use
> built-in geometry (Cuboid, Sphere, ...), and that was it, nothing
> about custom geometry. (Don't get me wrong I'm not ranting, what you
> guys are doing is awesome, as it has always been.)

How about the cunningly named custom-mesh-cpp example? ;)

https://code.woboq.org/qt5/qt3d/examples/qt3d/custom-mesh-cpp/main.cpp.html

Replace the buffer contents with your own geometry for a starting point.

Cheers,

Sean
-- 
Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
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