Why this polygon returns "Convex decomposing failed!" ?

Question

Is there a way to solve it automatically in code ? (GD or C# is fine)

Pedate

Answer 1

Convex decomposition expects valid manifold geometry at input. Your picture shows a polygon with zero thickness at places, making it non-manifold and therefore problematic for many computational geometry algorithms.

Imagination

Answer 2

Thanks bro you are the best!

Pedate