TriangleMeshTTriangleIndices Property

Array of integers that define the triangles (3 consecutive integers defined 3 indexes in the Vertices array that define a triangle). When the data in the TriangleIndices array are changed and if this mesh was already initialized (IsInitialized is true) then you need to call UpdateMesh or UpdateMesh(BoundingBox) method for the changes to take effect. When the TriangleIndices property is changed to another array, then UpdateMesh is called automatically.

public int[]? TriangleIndices { get; set; }