[Interest] Qt3D offscreen rendering

[Sean Harmer]

Hi,

that's pretty much exactly what the implementation of Scene3D does:

http://code.qt.io/cgit/qt/qt3d.git/tree/src/quick3d/imports/scene3d

Cheers,

Sean

On 14/12/2015 20:06, Harald Vistnes wrote:
> Hi,
>
> I'm trying to do offscreen rendering with Qt3D, but I have not figured 
> out how to do it yet. I have two use cases for this. One is to render 
> a single image in a console application, the other is to have a 
> desktop application with a 3D window and a button to save the current 
> view in a user specified resolution.
>
> I'm guessing I should use a subclass of QOffscreenSurface instead of 
> QWindow as the surface, is that right? Or should I pass a custom 
> render target to the render target selector in the frame graph?
>
> But how can I make Qt3D render a single frame, and how can I get the 
> rendered image back? In QOpenGLFrameBufferObject there are toImage() 
> functions, but there are no such functions in 
> Qt3DRender::QRenderTarget. Is there a way to do this, or have this 
> functionality not been implemented yet?
>
> Any hints on how to proceed would be welcome.
>
> Harald
>
>
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