Why can't I create a mesh with single triangular face?

[ivelin.peychev]

Note: I don’t understand anything about working with meshes.

[AndersDeleuran]

A face is just a list of indices defining the three/four vertices of the face:

[maje90 (Riccardo Majewski)]

Mesh topology work with a list of vertices (points).
Then all the edges and faces refer to the vertices list using indexes

The A, B, C, D inputs of Triangle or Quad components needs integers as inputs.

Your points were converted in integers (so almost random numbers) and that’s explain your error.

Use a default Triangle components with no inputs, it will be a simple “T{0;1;2}” as you need.

[ivelin.peychev]

Thanks a lot @AndersDeleuran, @maje90.