练习:选择样条曲线中open的点

max modify mode --切换到修改面板
subobjectlevel = 1
splinecount =numsplines $

for i = 1 to splinecount do
        (
    numbervet=(numSegments $ i)+1
    
    if isClosed $ i
    then continue    
    else setKnotSelection $ i #(1,numbervet)

    )    
updateShape $