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Surface3D: manipulate polar visualization

  • Hello everyone.
    I recently started working on QML for data visualization. I made a normal Qt C++ application with one QQuickWidget that I edited with QML code.
    I need to display a colormap with polar axes and therefore I took from the Qt Quick 2 Spectrogram Example.
    Therefore, I managed to obtain something like this

    However, I'm only interested in displaying the two upper radiants. For me the two lower quadrants are waste of space.
    Is it possible to only display the two quadrants form zero to 180 degrees?
    What I want to obtain is something like this (made with paint)

    Can anyone help me?


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