Hi

~~1st~~ and 4th vertex should be same for triangulated mesh… am I correct?

The **3rd** and the 4th vertices should be the same for a triangular **face**. There is no need to add more than three vertices for any singular triangular face.

I hope this makes it clearer:

``

Rhino.Geometry.Mesh mesh = new Rhino.Geometry.Mesh();

mesh.Vertices.Add(0.0, 0.0, 1.0); //0

mesh.Vertices.Add(1.0, 0.0, 1.0); //1

mesh.Vertices.Add(2.0, 0.0, 1.0); //2

mesh.Faces.AddFace(0, 1, 2);

//mesh.Faces.AddFace(0, 1, 2, 2); //this is the same ``

See here the code that does that.

I hope this helps,

## Giulio

Giulio Piacentino

for Robert McNeel & Associates

giulio@mcneel.com