Mesh 2 surfaces in different planes

[senseiMasai]

I'm trying to mesh 2 surfaces in different planes. However, I need to have common nodes in the common vertex. To do that, I tried 2 thigs:

• Define the external polygon normally and then define "geo.feature_points" with the nodes along the vertex. I define the same nodes in "geo.feature_points" in both surfaces.
• Define only the external polygon normally but discretizing manually the vertex under consideration in both surfaces trying to force the mesh to have a node where I need.

However, in both cases I'm able to have common nodes in both surfaces but new nodes appear in the middle suddenly. How can I avoid this?

Thank you in advance.

[nschloe]

I think you're simply using the wrong tool for the task. There's no explicitly mechanism in dmsh to prevent extra boundary nodes. You can try to reduce the number of nodes on that face, but like I said, there are no guarantees.