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"Standard expectations" for a renderer

  • the documentation of QQuickFrameBuffer::mirrorVertically mentions "standard expectations" of a renderer:

    This property controls if the size of the FBO's contents should be mirrored vertically when drawing. This alows easy integration of third-party rendering code that does not follow the standard expectations.

    What are the "standard expectations"?

    are those:
    x: from left to right
    y: from top to bottom
    and what about z? If z is from screen (so that z-axis in QtQuick matches) than the coordinate system is "left-hand" and I don't see this as a "standard" (I thought right-hand side cs is the standard). Where I can find more about the topic?