Effect.World = worldScaling * worldRotation * worldTranslation;
Effect.Alpha = Opacity;

triangle = new[]
{
    new VertexPositionColor(new Vector3(X0, Y0, 0), EFill),
    new VertexPositionColor(new Vector3(X2, Y2, 0), EFill),
    new VertexPositionColor(new Vector3(X1, Y1, 0), EFill),
};

background = new Quad(new Vector2(0, 0), new Vector2(1000, 1000), "Red", "White", 0, camera);
background.Opacity = 0.2f;
WindowPanel.Children.Add(background);

triangle = new Triangle(0, -50 + 90, 20, 0 + 90, -20, 0 + 90, "Black", "Red", 1);
triangle.Translation.X = 160;
triangle.Translation.Y = 160;
triangle.Translation.Z = -10;
triangle.Opacity = 0.5f;
WindowPanel.Children.Add(triangle0);