—————— 3D House with Layer Trick ——————— This technique is simple; you just have to imagine a model with an isometric or top-down perspective. Then, you divide it into horizontal layers along its imaginary X axis. In short, create a layer for the number of pixels you want to detail in the model. Then, using a pencil, you stamp each layer on top of the other and, using the glow effect, you can generate surface depth. It's a simple but powerful trick that's been around for years; this is just a simple and crude implementation in Scratch.
