I am trying to add a mesh generated from scretch in C# to a rhino Document. The generated Mesh has Normals and Face Normals set to the correct direction, however when I add it to Rhino Document, the displays shows me that some faces look in the correct direction, where as some faces look in the wrong direction (pink -> backface). Funny enough Vertex normals are displayed in the correct direction…
(see attached image, backward mesh is the mesh added to the rhino document, front mesh shows the vertex / face normals of the computed mesh before adding it to the document via GRasshopper. Black arrows are Vertex Normals, white arrows are Face Normals)
What happens when calling AddMesh command, why does that change face normal?
thx for the help