/// <summary> /// Called when geometry has been changed. /// </summary> protected override void OnModelChanged() { var mb = new MeshBuilder(); var p0 = this.Offset;// new Vector3(0, 0, 0); var d = this.Direction; d.Normalize(); var p1 = p0 + (d * (float)this.Length); mb.AddArrow(p0, p1, this.Diameter, 2, 64); this.Geometry = mb.ToMeshGeometry3D(); }