Dear list! Please, could someone explain to me how the BSP index of QGraphicsScene works?
Specifically, how is it possible that `items` return a list sorted by z-value? Is it a property of BSP index or are the items explicitly “z-sorted” after a the index narrows down the possible candidates? Also, if BSP is used with triangles, the slitting plate of a triangle might cut another triangle into halves. QGraphicsScene does not operate over triangles but, I presume, over minimum bounding rectangles. Where does the splitting plane cut through? Is it axis-aligned? Thanks a lot in advance! Ecir Hana
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