使用Sketchup Ruby API在圆柱体上打孔

我正在写一个脚本，在SketchUp（免费版，Mac）中制作一个简单的长笛。我想做一个管子，然后做一个圆柱体，穿过管子，画管子和圆柱体之间的交叉线，然后擦掉圆柱体，留下圆圈从管子上切下来

如果我用鼠标来做的话，这是可行的，但是我发现很难用鼠标精确地定位和测量。不过，到目前为止，我还不能让它与脚本一起工作。目前我一直在用它在管子上画不完整的圆圈，所以我无法找到这张脸并将其抹掉。您应该能够在ruby控制台中运行以下脚本，并了解我的意思。我做错了什么

entities = Sketchup.active_model.entities

# make tube
tube = entities.add_group
tube_inner = tube.entities.add_circle Geom::Point3d.new(0,0,0), Geom::Vector3d.new(0,0,1), 5, 360
tube_outer = tube.entities.add_circle Geom::Point3d.new(0,0,0), Geom::Vector3d.new(0,0,1), 6, 360
cross_section_face = tube.entities.add_face tube_outer
inner_face = tube.entities.add_face tube_inner
tube.entities.erase_entities inner_face
cross_section_face.pushpull -10, false

# make a cylinder that punches through the wall
hole_punch = entities.add_group
hole_outer = hole_punch.entities.add_circle Geom::Point3d.new(0,0, 5), Geom::Vector3d.new(0,1,0), 3, 360
face = hole_punch.entities.add_face hole_outer
face.pushpull 10, false

# draw the intersection lines and erase the hole punch
entities.intersect_with true, hole_punch.transformation, tube, tube.transformation, true, hole_punch
hole_punch.erase!

---

确定相交后要擦除的正确面可能非常棘手

但是，由于您使用的是圆柱体形状（即实体），我建议您使用SketchUp 8 Pro中引入的实体布尔运算。例如，您可以使用

Group.subtract

但是，如果您没有使用SketchUp 8 Pro或更新版本，则这些方法将不可用

---

替代解决方案-避免使用Pro版本的Solid Tools方法：

entities = Sketchup.active_model.entities

# (!) You created a circle with so many edges that at the scale
#     you drew it they where pushing the boundary of how small
#     units SketchUp can handle. (1/1000th inch).
#     If you has Edge Outline style enabled you could see that
#     not all edges where fully merged.
#     I reduced the curve segments from 360 to 180.
#     (Do you really need such a high mesh density anyway?)

# make tube
tube = entities.add_group
tube_inner = tube.entities.add_circle Geom::Point3d.new(0,0,0), Geom::Vector3d.new(0,0,1), 5, 180
tube_outer = tube.entities.add_circle Geom::Point3d.new(0,0,0), Geom::Vector3d.new(0,0,1), 6, 180
cross_section_face = tube.entities.add_face tube_outer
inner_face = tube.entities.add_face tube_inner
tube.entities.erase_entities inner_face
cross_section_face.pushpull -10, false

# make a cylinder that punches through the wall
hole_punch = entities.add_group
hole_outer = hole_punch.entities.add_circle Geom::Point3d.new(0,0, 5), Geom::Vector3d.new(0,1,0), 3, 180
face = hole_punch.entities.add_face hole_outer
face.pushpull 10, false

# draw the intersection lines and erase the hole punch
entities.intersect_with true, hole_punch.transformation, tube, tube.transformation, true, hole_punch
hole_punch.erase!

# Find all the edges that belong to the Circle elements drawn
# earlier (including the ones push-pulled).
# (Could also collect these earlier before intersecting by
#  collecting all non-smooth edges.)
circles = tube.entities.grep(Sketchup::Edge).select { |e| e.curve }.uniq
# Then we pick out all the faces that isn't connected to these edges and erase them.
new_faces = tube.entities.grep(Sketchup::Face).select { |f| (f.edges & circles).empty? }
entities.erase_entities( new_faces )

如果您真的想要360段圆，您可以向上缩放组的内容，同时向下缩放组实例。这样一来，群体的定义规模就大得多了。（请参阅这篇关于SketchUp中的实例和定义的文章：）

此外，如果希望面填充内外蒙皮之间的孔，则还需要与该零件相交

---

请注意

实体。与
描述相交-当前文档不能很好地解释所有参数。有两个
实体
参数

第一个应该是一个
Sketchup:：Entities
对象，其中应该显示相交的对象。（我有点惊讶，它居然能用
Sketchup:：Group
对象来工作。）

第二个应该是而不是
Sketchup:：Entities
，这将失败。它必须是一个
Sketchup:Entity
或
Sketchup:Entity
对象数组。
我看到pro版本中存在这些方法，但问题是我不希望使用Sketchup来证明花费500美元是合理的。哦，好吧。这对我来说并不能真正解决问题，但对其他人来说可能会，所以我会接受答案。谢谢你的建议。我添加了一个可供选择的解决方案，你可以尝试。到目前为止，我找到的
intersect\u的最佳分解是：谢谢，我会尝试一下。与此同时，我已经切换到OpenSCAD，它让我可以轻松地完成所有这些工作。