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polyhedron is not filled internally

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polyhedron is not filled internally

Endre
Hello,

I have a problem with the STL file.
Please take a look at this: http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl.
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Re: polyhedron is not filled internally

nophead
The faces of the polygons that meet in the middle have the wrong winding order. If you press F12 you will see they are purple. Perhaps that is causing the issue.

On 18 March 2017 at 10:16, Endre <[hidden email]> wrote:
Hello,

I have a problem with the STL file.
Please take a look at this:
http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl
<http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl>
.



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Re: polyhedron is not filled internally

nophead
The last face should be [8, 3, 1, 0] in both cases.

On 18 March 2017 at 10:59, nop head <[hidden email]> wrote:
The faces of the polygons that meet in the middle have the wrong winding order. If you press F12 you will see they are purple. Perhaps that is causing the issue.

On 18 March 2017 at 10:16, Endre <[hidden email]> wrote:
Hello,

I have a problem with the STL file.
Please take a look at this:
http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl
<http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl>
.



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Re: polyhedron is not filled internally

Endre
In reply to this post by nophead
Thanks for the quick reply! I'll check.
I have even tried to look for such issues with "Thrown Together" but I did not notice it.
Perhaps I'll see it if I preview the model without mirroring.

Can it cause a problem that the middle face is the mirror plane? So it is mirrored to itself with inverse normal.

Here I have attached an image, I don't see the purple faces from outside. I can see purple only if I zoom inside the model.
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Re: polyhedron is not filled internally

nophead
Yes you need to remove one of the polyhedrons to see the problem.

I think the union fails when its inputs are not manifold. I don't see any duplicate faces when I fix the polyhedrons.






On 18 March 2017 at 11:11, Endre <[hidden email]> wrote:
Thanks for the quick reply! I'll check.
I have even tried to look for such issues with "Thrown Together" but I did
not notice it.
Perhaps I'll see it if I preview the model without mirroring.

Can it cause a problem that the middle face is the mirror plane? So it is
mirrored to itself with inverse normal.

Here I have attached an image, I don't see the purple faces from outside. I
can see purple only if I zoom inside the model.
<http://forum.openscad.org/file/n20950/cobra.png>



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Re: polyhedron is not filled internally

Endre
Thank you very much! It has really solved the problem.
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