private static Model BuildPlane(System.Drawing.Color material) { var assembler = new Assembler { Color = material }; assembler.AddVertex(-1, 0, 1); assembler.AddVertex(1, 0, 1); assembler.AddVertex(1, 0, -1); assembler.AddVertex(-1, 0, -1); assembler.CreateTriangle(0, 1, 2); assembler.CreateTriangle(2, 3, 0); return(assembler.Compile()); }