怎么绘制管状正方形

1、先来画一个正方形：连结四条线段。Graphics3D[Line[{{1, 0, 0}, {0, 1, 0}, {-1, 0, 0}, {0, -1, 0}, {1, 0, 0}}]]

3、或者，还可以写为：Graphics3D[ Line[{{1, 0, 0}, {0, 1, 0}, {-1, 0, 0}, {0, -1, 0}, {1, 0, 0}}]] /. Line[pts_] -> Tube[pts]

5、还可以这样：Graphics3D[Tube[{{1, 0, 0}, {0, 1, 0}, {-1, 0, 0}, {0, -1, 0}, {1, 0, 0}},0.3]]

7、改变颜色，实现渐变色：Graphics3D[{JoinForm["Miter"], Tube[{{1, 0, 0}荑樊综鲶, {0, 1, 0}, {-1, 0, 0}, {0, -1, 0}, {1, 0, 0}}, 0.1, VertexColors -> {Red, Green, Pink, Blue, Red}]}]