Progress! Here's my current framegraph: RenderSurfaceSelector: Viewport: ClearBuffers: buffers: ColorDepthBuffer clearColor: "#EEfaebd7" NoDraw: {} FrustumCulling: # OnScreen CameraSelector: objectName: onScreenCameraSelector RenderCapture: objectName: onScreenCapture # OffScreen CameraSelector: objectName: offScreenCameraSelector RenderTargetSelector: target: RenderTarget: attachments: - RenderTargetOutput: attachmentPoint: Color0 texture: Texture2D: width: 512 height: 512 format: RGBAFormat ClearBuffers: buffers: ColorDepthBuffer clearColor: "#EEfaebd7" NoDraw: {} RenderCapture: objectName: offScreenCapture
Results of the render captures: onScreenCapture: https://postimg.cc/image/v26nfj36l/ offScreenCapture: https://postimg.cc/image/68x3evrvx/ I fixed the offscreen aspect ratio issue by creating a new offscreen camera and forwarding all but these two signals: Qt3DRender::QCamera::aspectRatioChanged Qt3DRender::QCamera::projectionMatrixChanged Question: 1) I am using an RGBAFormat for my texture. I changed the alpha in the clear colour from 0x80 to 0xEE and I now see an alpha cleared background in the offscreen (see image). I can just use RGB for my purposes right now, but I'm curious why the onscreen clearing is not using the alpha channel? I can confirm this by changing the clear colour to #FF000000 - I just get solid black. Problem: 1) The resulting scene isn't the same in the offscreen capture: - the yellow cube is on top of everything - the red & blue arrows aren't clipped by the plane - it isn't antialiased I'm wondering if this is because the shaders aren't being used for the offscreen texture? I noticed in apitrace that when switching GL_DRAW_FRAMEBUFFER to 0 (onscreen), glUseProgram(1) is called. This is not called when switching GL_DRAW_FRAMEBUFFER to 1 (offscreen). Is the program supposed to persist or does it need to be called again when switching framebuffers? (apitrace is super-cool. Thanks for the pointer.) Thank you for your time & help! --- Andy Maloney // https://asmaloney.com twitter ~ @asmaloney <https://twitter.com/asmaloney>
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