[Interest] Qt3D Rendering offscreen
asmaloney at gmail.com
Fri Aug 11 20:34:34 CEST 2017
Goal: With Qt3D (C++), render my scene offscreen, use render capture on it,
and save image to disk.
With my Qt3DWindow-based solution the scene looks fine and I can do the
render capture part (on macOS anyways - Windows doesn't work for me -
Now I need to be able to do it offscreen (without the window open).
I thought this was going to be as simple as setting a QOffscreenSurface as
my forward renderer surface - something like:
QOffscreenSurface *surface = new QOffscreenSurface;
Qt3DExtras::QForwardRenderer *forwardRenderer = new
forwardRenderer->setSurface( surface );
forwardRenderer->setExternalRenderTargetSize( QSize( 800, 600 ) );
qDebug() << surface->format() << surface->size() << surface->isValid();
While this gives me a valid surface and the format is correct, its size is
always (1,1) and the render capture gives me images of that size.
How do I set the size of the QOffscreenSurface?
Or am I going about this the wrong way?
(It would be nice to have a class like the Qt3DWindow one specifically for
Andy Maloney // https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>
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