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📅  最后修改于: 2022-03-11 14:59:16.640000             🧑  作者: Mango
//3x3 matrix becomes 4x4 like this:- [ a11 a12 a13 0 ] [ a21 a22 a23 0 ] [ a31 a32 a33 0 ] [ 0 0 0 1 ]