【VTK】create spline points

定义5个点 double p[5][3] = { {0.0, 4.0, 0.0}, {2.0, 0.0, 0.0}, {4.0, 2.0, 0.0}, {6.0, 0.0, 0.0}, {8.0, 4.0, 0.0}

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