[OpenSCAD] Rounded Polygon

nop head nop.head at gmail.com
Fri May 3 11:31:35 EDT 2019


I think the correct term is Constructional Solid Geometry
https://en.wikipedia.org/wiki/Constructive_solid_geometry  You might find
books on that but they are probably more about theory than actually how to
make specific shapes with it.

On Fri, 3 May 2019 at 16:03, William Adams <will.adams at frycomm.com> wrote:

> Okay. Discussion of a list of two-dimensional shapes,
> mathematical/programmatic techniques for dividing shapes into regions, and
> the possible shapes which one can use in such deconstruction.
>
> Suggested text/terminology, esp. a book suited to a layman.
>
> Eventually the project may work up to 3 dimensional shapes, but for now,
> trying to limit it to stacks of two-dimensional shapes cut into a
> three-dimensional stock.
>
> William
>
> On Fri, May 3, 2019 at 10:43 AM nop head <nop.head at gmail.com> wrote:
>
>> I don't think topology is what you mean. For example a doughnut and a
>> teacup with a handle are topologically the same.
>>
>> On Fri, 3 May 2019 at 14:54, William Adams <will.adams at frycomm.com>
>> wrote:
>>
>>> I've been working through this sort of thing myself, and have been
>>> working up a series of basic modules which do rounded edged (and optionally
>>> bottomed) pockets so as to model projects for a hobby CNC.
>>>
>>> The problem of course is working up a reasonable definition of the
>>> shapes in terms of parameters --- I believe the field which covers this
>>> sort of thing is topology?
>>>
>>> Does anyone know of any good texts on this which might be approachable
>>> to a layman?
>>>
>>> William
>>>
>>>
>>> On Fri, May 3, 2019 at 7:11 AM nop head <nop.head at gmail.com> wrote:
>>>
>>>>  I use an inverted truncated rotate_extruded teardrop on the bottom
>>>> edges of my rounded objects so they don't need support when printing. I
>>>> assume that is what a "teardrop edge" is.
>>>>
>>>> [image: handle.png]
>>>>
>>>> On Fri, 3 May 2019 at 12:05, <arnholm at arnholm.org> wrote:
>>>>
>>>>> On 2019-05-03 11:58, adrianv wrote:
>>>>> > So I have a rounded box with a teardrop edge at the base, a rounded
>>>>> top
>>>>> > edge, and a more rounded interior bottom edge.
>>>>> >
>>>>> > <http://forum.openscad.org/file/t2477/fbox1.png>
>>>>>
>>>>> That's very, very nice (and clever)! But what is a "teardrop edge"
>>>>> precisely?
>>>>>
>>>>> Carsten Arnholm
>>>>>
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