[Interest] Qt3D - Render to QImage

[Juan Jose Casafranca]

Hi Sean,

is there any example on how to do that? I tried to use a QRenderCapture but
I failed two weeks ago.

Is there any way to access the buffers content data using a similar
approach to the QRenderCapture method?
For example, in an animation system, use a graphics pipeline to compute the
deformed mesh and then get the new vertex positions for export.

Cheers
Juan José

2016-11-28 11:13 GMT+01:00 Sean Harmer <sean.harmer at kdab.com>:

> On Monday 28 November 2016 02:23:59 Philip Schuchardt wrote:
> > I'm trying to port my OpenGL code (https://github.com/Cavewhere/
> cavewhere/)
> > to use Qt3D. I think Qt3D will allow me to quickly improve and modify my
> > rendering pipeline. The one requirement I need is to be able to render
> to a
> > QImage and save it to disk. Currently, have a method that renders
> > high-resolution images from OpenGL. I do this by tiling a projection
> matrix
> > and rendering the scene one tile at a time and combining them into on
> huge
> > PNG. The problem is I'm not sure how to render Qt3D pipeline to a texture
> > and then download if from the GPU into memory in Qt3D. Is there an easy
> way
> > to do that? Do I need to create my own Aspect?
>
> Hi, you can use a custom frame graph that includes a QRenderCapture node
> (coming in Qt 5.8). If you combine this with a camera and some logic for
> tiling the frustum (NodeInstantiator) you should be able to replicate your
> existing logic. I'd like to get something like this wrapped up along with
> Qt
> 5.9.
>
> > Also, many parts of the documentation seem to be missing, very light, and
> > not up to the same standard as the rest of Qt's documentation.
>
> Yes this is something I really want to have a push on in the near future.
>
> Cheers,
>
> Sean
>
> > Perhaps,
> > I'm just missing something from the undocumented documentation.
> >
> > Thanks,
> > Phi|ip
>
> --
> 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
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