[Interest] Getting access to a rendered image in Qt 3D

[Christensen, Matias]

I tried using QRenderCapture by combining the rendercapture-qml and shadow-map-qml examples to be able to capture a rendered image at a fixed resolution. I feel like i am close, but just get a black image when i try to capture the image.

I would appreciate it if anyone could take the time to look at what i have gotten so far, and tell me what i am doing wrong: https://u2671948.dl.dropboxusercontent.com/u/2671948/multiviewport.tar.gz

On 19. juni 2017 11:59, Andy wrote:
What you're probably looking for is QRenderCapture:

  https://doc.qt.io/qt-5/qt3drender-qrendercapture.html

I've used it with mixed success to save out images and create a movie using ffmpeg - works fine on macOS, isn't working for me on Windows (see https://bugreports.qt.io/browse/QTBUG-61223 ).

I also don't know how to set the resolution other than changing the actual window the scene is being rendered in (maybe there's a way to do it using offscreen rendering but I haven't figured it out).

---
Andy Maloney  //  https://asmaloney.com
twitter ~ @asmaloney<https://twitter.com/asmaloney>


On Mon, Jun 19, 2017 at 11:24 AM, Christensen, Matias <Matias.Christensen at flir.com<mailto:Matias.Christensen at flir.com>> wrote:
I have a Qt application with a 3D scene using Qt 3D.

What i want is to be able to render a camera at a specific resolution
and framerate, and then to be able to access the resulting images in C++
code so i can encode it using h264 and send it to a different process.

I am having trouble finding a way to get access to the rendered image, i
image this is made difficult as the image never leaves GPU memory and i
need to get access to it in main memory.

Does anyone have a suggestion on how i might go about doing this?


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