How can I filter flipped surfaces and revers normal of them?


This is Fusion 360 Model window.

I made those pattern polysurfaces with Dynamo and then imported them in Fusion 360.

But some surfaces had flipped direction of surface irregularly.

How can I filter flipped surfaces and revers normal of them?

Please advise me, thanks :slight_smile:

-------------------------- more Image -------------------------

Fusion 360 shows flipped side in Yellow (ocher), correct side in Gray.
In Fusion 360, to Execute a command such as Combine, Join… the target faces must all be in the same direction.
So I need Gray all faces.

This is command to revers face.

After execute the command, the color of faces I selected for reversing changed from yellow to gray.


can you show more how it is flipped ? it is not clear


I added more images :slight_smile:


im thinking about take all surfaces and make a vector from two point, one from the surface and the other is the center of the whole shape
then take the normal for each surface ,
finally take the angel between them, im sure it will be clear to you to find which surfaces have flipping face


Thanks so much. I’ll try your advice.


What if you build a polysurface or mesh from it, and turn that into your stl? Haven’t tried that myself but it may repair the normals.


Hi @Lynn_Kim

Is it possible to drop dyn file here?


oh! good idea! I will try your solution thank you very much :slight_smile:


Hello! @Kulkul
I have another question one about my nodes of visualprogram. I will upload the question soon with this dyn file. :smile:


My nodes are unstable, and you need to load the SAT file that I shared with them.

I hope you give me a good advice after open my dyn file and see my nodes. :slight_smile:
model_export.sat (1.8 KB)
triangular pattern on cone.dyn (244.3 KB)


Below is the topic I mentioned. Could you reed this?