PeachDrawing
PeachDrawing.Homography
Homography.FromMatrix4(Matrix4x4) Method
What a 4x4 (System.Numerics, row-vector convention) does to the plane z = 0: the points (x, y, 0, 1) drop their z and divide by the fourth coordinate.
public static PeachDrawing.Homography FromMatrix4(in System.Numerics.Matrix4x4 m);