[OpenSCAD] degenerate polyhedron faces ok?

adrianv avm4 at cornell.edu
Tue Nov 19 06:14:34 EST 2019


Nope.  Adding more geometry doesn't cause render to fail.  


nophead wrote
> I think CGAL will throw an exception if you do a union with a unit cube();
> 
> On Tue, 19 Nov 2019 at 01:27, Doug Moen <

> doug@

> > wrote:
> 
>> Degenerate faces like this should generally be avoided. The face has zero
>> area, and the normal vector is [0,0,0]. That's considered defective, and
>> some programs will not allow you to import such a mesh. Other programs
>> won't have a problem.
>>
>> On Mon, Nov 18, 2019, at 8:24 PM, adrianv wrote:
>> > Is it legal to give a polyhedron faces that have zero area, e.g. a face
>> like
>> > [ [0,0,0],[0,0,0], [0,0,1],[0,0,1]]?  Or a degenerate "triangle" like
>> > [[0,0,0],[0,0,0],[0,0,1]]?   What about a completely degenerate faces
>> where
>> > all vertices are equal?
>> >
>> > In trying to implement a certain degenerate case in my code I have used
>> some
>> > degenerate faces and it appears to work.  (I can render, and add
>> multiple
>> > polyhedra to the model.)   But I wonder if there might be hidden
>> problems.
>> >
>> >
>> >
>> >
>> > --
>> > Sent from: http://forum.openscad.org/
>> >
>> > _______________________________________________
>> > OpenSCAD mailing list
>> > 

> Discuss at .openscad

>> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
>> >
>>
>> _______________________________________________
>> OpenSCAD mailing list
>> 

> Discuss at .openscad

>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
>>
> 
> _______________________________________________
> OpenSCAD mailing list

> Discuss at .openscad

> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org





--
Sent from: http://forum.openscad.org/



More information about the Discuss mailing list