this is a bspline test program, and it s very easy to understand because most parts of program is the bspline parts

BSplineTest\bspline.jpg
...........\BSplineTest.pro
...........\BSplineTest.pro.user
...........\main.cpp
...........\OGLdpf.log
...........\release\BSplineTest.exe
...........\.......\icudt53.dll
...........\.......\icuin53.dll
...........\.......\icuuc53.dll
...........\.......\libgcc_s_dw2-1.dll
...........\.......\libstdc++-6.dll
...........\.......\libwinpthread-1.dll
...........\.......\Qt5Core.dll
...........\.......\Qt5Gui.dll
...........\.......\Qt5Widgets.dll
...........\widget.cpp
...........\widget.h
...........\widget.ui
...........\release
BSplineTest

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