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Topologic Mirror surface normal

1. M by mvr on 3 Dec 2022, edited 7 Dec 2022 #

   Hi everyone, quick question.

   Is there a way to mirror or flip a surface normal with a topologic node in dynamo.

   I am now getting the surface out of the topologic graph and putting it back in later.

   Kind regards,

   Piet

2. T by theoryshaw on 6 Dec 2022 #

   @topologic might know.

3. T by topologic on 6 Dec 2022, edited 6 Dec 2022 #

   Sadly in Dynamo there isn't a direct method to reverse a topologic face AFAIK. Instead here are the manual steps that are needed:

   1. Get the Wire subtopology of the face (assuming a simple face with no holes for now) Face.Wire.

   2. Get the vertices of the Wire (These will be ordered) Wire.Vertices

   3. Reverse the list of vertices (Use Dynamo to reverse a list)

   4. Re-build the wire from the reversed list of Vertices (I am hoping there is Wire.ByVertices. I don't remember. If not, do a loop to build Edges from consecutive vertices and then do a Wire.ByEdges.

   5. Re-build the Face from the Wire (Face.ByExternalInternalBoundaries). It should now be pointing in the opposite direction

   You could do all this in one custom python designscript code.

4. M by mvr on 6 Dec 2022 #

   Thank you for your response. I will try the solution above.

   Kind regards.

5. T by topologic on 7 Dec 2022 # +2 votes

   I have added a Face.Invert method to topologicpy (but sadly, Topologic for Dynamo is now outdated). I encourage you to move to either integrate topologicpy in Dynamo or in Blender

   https://topologic.app/topologicpy_doc/topologic_pdoc/Face.html#Face.Face.Invert

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