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

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.

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Thanks a lot @AndersDeleuran, @maje90.