The A+B+C blend becomes even more powerful when used with a D texture. Here a fourth texture is added to drive transparency. In this case I used the Bees Eye texture to drive transparency. Imagine using this but with terrain textures instead. Now imagine duplicating the terrain object, scaling it down a tiny bit and applying a different texture to that. Here I slipped a scaled down duplicate cube and applied an A blend (green). Further imagine putting an A+B blend on that duplicate terrain. Why stop there when you can go crazy and add another A+B+C and D blend? Youll get all types of unique terrain textures. The lower image shows the duplicate scaled down cube with an A+B blend on it.