[Interest] [Qt3D] Distance field and texture atlas

[Xavier Bigand]

I am working on an architecture and design software.

There is a lot of feature in Qt3D that interest us for our software, I
already have made a prototype based on Qt3D as replacement of our homebrew
3D engine.

I am interesting in improving rendering of 2D elements :
[image: Images intégrées 2]
As you can see with our engine the scale can cut texts and grips aren't
well filtered. Using distance field can help a lot because all elements can
be scaled during the zoom.

PS: We also think to add MSAA filtering





2016-04-21 15:02 GMT+02:00 Sean Harmer <sean.harmer at kdab.com>:

> Hi,
>
> On Thursday 21 April 2016 14:50:55 Xavier Bigand wrote:
> > I know that QtQuick already manage the distance field for text elements,
> > but I want to be able to use it with Qt3D too.
> > Our Qt3D objects are managed in C++ code not in QML, we prefer to not
> bind
> > those elements in QML because of the memory overhead.
>
> Oh sorry, I didn't realise you were talking about Qt 3D. Qt 3D does not use
> distance fields at all in any out of the box materials at this stage. You
> will
> need to write a custom Material/Effect to sample from the distance fields.
> Can
> you elaborate a bit on your particular use case please? Maybe this is
> something we can integrate for Qt 5.8?
>
> > Does the backend of QML and Qt3D share the same Rendering backend?
>
> No. The integration point is in the Scene3D item. Other than that Qt 3D is
> distinct from Qt Quick.
>
> Cheers,
>
> Sean
>
> >
> > 2016-04-21 14:34 GMT+02:00 Sean Harmer <sean.harmer at kdab.com>:
> > > On Thursday 21 April 2016 12:51:27 Xavier Bigand wrote:
> > > > Hi,
> > > >
> > > > Is there any plans to let the user control distance field and texture
> > >
> > > atlas?
> > >
> > > > We are interested by the distance field for text and icons rendering
> as
> > >
> > > we
> > >
> > > > apply scale and rotation on some small elements. We have to much
> > > > elements
> > > > to regenerate textures at the right size from svg or ttf, and doing a
> > >
> > > cache
> > >
> > > > can consume a lot of memory.
> > >
> > > What do you want to control? QML text elements use a distance field
> glyph
> > > cache
> > > out of the box (unless you force it to native rendering). I think the
> > > vertical
> > > size of this is hard wired for now. In theory it could be exposed.
> > >
> > > Afaik Image elements don't use a distance field at all, so you would
> need
> > > to
> > > write a custom QQuickItem plus material to make use of distance fields
> > > here.
> > >
> > > > Texture atlas can also a good thing to improve performances, but with
> > > > new
> > > > API that are coming like vulkan the interest will decrease, so this
> > >
> > > feature
> > >
> > > > will be interesting only for few years.
> > >
> > > That assumes a backend to Qt Quick that uses something which supports
> > > bindless
> > > textures.
> > >
> > > Cheers,
> > >
> > > Sean
> > > --
> > > Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> > > KDAB (UK) Ltd, a KDAB Group company
> > > Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
> > > Mobile: +44 (0)7545 140604
> > > KDAB - Qt Experts
>
> --
> Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> KDAB (UK) Ltd, a KDAB Group company
> Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
> Mobile: +44 (0)7545 140604
> KDAB - Qt Experts
>



-- 
Xavier
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