Demo of using VK_NV_raytracing in a (Vulkan-only) QRhi application. Needs an RTX card, a recent Vulkan SDK, and a patched (*) qtbase 5.15. The result is a wonderful triangle. It uses QRhi's facilities as much as possible, in order to reduce the native Vulkan boilerplate needed, so this also a good test of accessing the native objects backing a QRhiBuffer or QRhiTexture. The raytracing shaders and much of the pipeline setup are based on the sample at https://github.com/SaschaWillems/Vulkan/tree/master/examples/nv_ray_tracing_basic (*) https://codereview.qt-project.org/c/qt/qtbase/+/291562 https://codereview.qt-project.org/c/qt/qtbase/+/292530 https://codereview.qt-project.org/c/qt/qtbase/+/292531