I would like to know if we can quickly obtain a polygon corresponding to a selection.
I manage to do it in python, but for the large meshes it's much too slow, because I do treatments on the indices of points and faces.
Below, with python, I create two polygons with the corresponding material, for the two selections (selection_1 and selection_2)
For a large mesh (greater than 100 Mo), the use of indices for points and faces considerably slows down the program.
We see that the initial polygon has been divided correctly, according to the two selections