rendering - 在 openSCAD 中用多面体创建一个“杯子”

Question

我正在尝试使用八角棱镜（使用该polyhedron功能）创建一个“杯子”形状（一端开口的空心）。当我渲染我的代码时，OpenSCAD 不会渲染底面和内面。我究竟做错了什么？

谢谢！

我的代码：

difference() {
    polyhedron(points = [ [21.5,51.9,0],[51.9,21.5,0],
    [-21.5,51.9,0],[-51.9,21.5,0],
    [-21.5,-51.9,0],[-51.9,-21.5,0],
    [21.5,-51.9,0],[51.9,-21.5,0],
    [21.5,51.9,100],[51.9,21.5,100],
    [-21.5,51.9,100],[-51.9,21.5,100],
    [-21.5,-51.9,100],[-51.9,-21.5,100],
    [21.5,-51.9,100],[51.9,-21.5,100] ], faces = [
    [0,1,9,8],[2,0,8,10],[3,2,10,11],[5,3,11,13],
    [4,5,13,12],[6,4,12,14],[7,6,14,15],[1,7,15,9],
    [0,1,7,6,4,5,3,2],[8,9,15,14,12,13,11,10] ]);

    polyhedron(points = [ [19,49.4,5],[49.4,19,5],
    [-19,49.4,5],[-49.4,19,5],
    [-19,-49.4,5],[-49.4,-19,5],
    [19,-49.4,5],[49.4,-19,5],
    [19,49.4,100],[49.4,19,100],
    [-19,49.4,100],[-49.4,19,100],
    [-19,-49.4,100],[-49.4,-19,100],
    [19,-49.4,100],[49.4,-19,100] ], faces = [
    [0,1,9,8],[2,0,8,10],[3,2,10,11],[5,3,11,13],
    [4,5,13,12],[6,4,12,14],[7,6,14,15],[1,7,15,9],
    [0,1,7,6,4,5,3,2],[8,9,15,14,12,13,11,10] ]);
}

我的渲染问题的图像：

Answer 1

如果您使用polyhedron()，则应始终按照此处所述检查面的方向： documentation openscad

您会看到，在这两种情况下，底面的方向都是错误的，这里是您的内部polyhedron()：

替换[0,1,7,6,4,5,3,2]底面[2,3,5,4,6,7,1,0]，你就得到了你的杯子：