private static int modelKey(int side, int rot) {
        return side << 2 | rot & 3;
    }
Needs to exist because Vanilla's default {@link ConfiguredModel} only supports a single x rotation and y rotation,
making it very difficult to render blocks that can not only be oriented to all 6 sides, but also rotated about those
sides. With only x/y rotations, we would have to use UV-mapping to rotate the textures themselves rather than the model.
core/src/main/java/mrtjp/projectred/core/client/FullyOrientableBlockRenderer.java