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Why RenderingPrimitives are always invalid in Vuforia

August 1, 2017 - 2:35am #1

my code is :


   renderingPrimitives = new Vuforia::RenderingPrimitives(Vuforia::Device::getInstance().getRenderingPrimitives());


   Vuforia::ViewList& viewList = renderingPrimitives->getRenderingViews();

   for (int i = 0; i <viewList.getNumViews(); i++)


    Vuforia::VIEW vw = viewList.getView(i);

    Vuforia::Vec4I viewport = renderingPrimitives->getViewport(vw);



but viewport is {0,0,0,0}  


I wait for a long time ,but viewport is still {0,0,0,0}


I have called Vuforia::CameraDevice::getInstance().start()  before I run the Mentioned code。



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