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+---
+title: Basic Wave Function Collapse
+weight: 2
+---
+
+![wfc generation in blender](generate.mp4)
+
+This 3D autotiling project started when I stumbled on [Martin Donald's Wave
+Function Collapse video](https://www.youtube.com/watch?v=2SuvO4Gi7uY). The idea
+was explained so well that I had to try it out. 
+
+In this post I will attempt to outline the high level structure of a Wave
+Function Collapse implementation with a bit of psudo-Python. The following
+isn't really intended to be a tutorial, but more of an introduction that sets
+the stage for some future posts.
+
+## Types
+
+We have a few foundational types that make up the implementation:
+
+### Prototypes
+
+```python
+class Prototype:
+    name: str
+    mesh: str
+    rotation: int
+
+    # sockets
+    north: str
+    east: str
+    south: str
+    west: str
+    top: str
+    bottom: str
+```
+
+A prototype represents a possible choice to put somewhere in the grid. We will
+have 4 prototypes for each tile in our tileset, one for each 90 degree
+rotation.
+
+### Sockets
+
+On each of the 6 faces we will have a socket. These identify which `Prototype`s
+can connect to eachother in each direction. The socket is a representation of
+what we see when we look at one face of the tile's bounding box.
+
+
+![highligted socket](socket.jpg)
+
+For the north and south or east and west sockets to match, they must be mirrors
+of one another. For a vertical face's socket to match (top to bottom) the
+sockets must be identical. Sockets are arbitrary strings, except for the
+suffixes on horizontal faces' sockets: `s` (symmetrical) and `f` (flipped).
+
+```python
+def compatible_sockets(face, a, b) -> bool:
+    # symmetrical faces should be identical
+    if face in {"top", "bottom"} or a.endswith("s"):
+        return a == b     
+    flipped_b = socket[:-1] if socket.endswith("f") else b + "f"
+    return a == flipped(b)
+```
+
+### Cells
+
+```python
+class Cell:
+    possibilities: list[Prototype]
+```
+
+A cell is one element in a `Grid`, which is just a collection of `Cell`s. 
+
+### Grid
+
+Turns out there are a lot of ways to represent the `Grid`. 
+
+It could be a 3D array:
+
+```python
+class Grid:
+    grid: list[list[list[Cell]]]
+```
+
+Or for an infinite grid, a map that lazily populated:
+
+```python
+class Grid:
+    grid: dict[Vec3, Cell]
+
+    def __getitem__(self, coord: Vec3):
+        if key not in self.grid:
+            self.grid[coord] = Cell()
+        return self.grid[coord]
+```
+
+It doesn't really batter as long as we can look things up using a 3D integer coordinate.
+
+## Implementation
+
+```python
+def solve():
+    work_list = []
+    solved = False
+    iteration = 0
+    while not solved and iteration < MAX_ITERATIONS:
+        iteration += 1
+
+        cell, coord = grid.find_min_entropy()
+        if cell is None:
+            solved = True
+            break
+
+        cell.collapse()
+        work_list.append(coord)
+        while len(work_list) > 0:
+            work_list += propagate(work_list.pop())
+```
+
+This is the main structure of the program. Make a random selection in one of the cells
+recursively propagate that out and repeat until every cell has only one possibility.
+You can run the outer loop by hand in this [web demo](https://bolddunkley.itch.io/wfc-mixed) 
+from Martin Donald.
+
+### Collapse 
+
+In this algorithm, "entropy" is a cute name for the length of a `Cell`'s
+possibility list. Zero means there is a contradiction and we will never be able
+to solve the `Grid`. One means we know the `Prototype` that we've chosen for
+this cell. In each iteration, we find the unsolved Cell we're most certain
+about:
+
+```python
+def min_entropy(self) -> Cell:
+    def entropy(cell):
+        if cell.entropy() < 2:
+            return math.inf
+        return cell.entropy()
+    return min(self.grid, key=entropy)
+
+```
+
+Then we "collapse" it's possibilities into a random choice:
+
+```python
+def collapse(self):
+    idx = randint(0, len(self.possibilities) - 1)
+    self.possibilities = [self.possibilities[idx]]
+```
+
+### Propagate
+
+```python
+def propagate(coord):
+    cur_cell = self.grid.get(cur_coord)
+    changed_neighbors = []
+    for direction in opposing_faces.keys():
+        next_coord = add_vec3(cur_coord, face_deltas[direction])
+        if not self.grid.is_in_bounds(next_coord):
+            continue
+        next_cell = self.grid.get(next_coord)
+        changed = grid[next_cell].constrain_to_neighbor(cur_cell, direction)
+        if changed:
+            changed_neighbors.append(next_coord)
+            self.propagation_stack.append(next_coord)
+    return changed_neighbors
+```
+
+Any time we change the possibility list of one cell,
+the neighboring cells are possibly affected. We reduce the possibility list
+of each neighboring cell with `constrain_to_neighbor` and if that causes
+a change, we will have to propagate to _that_ cell's neighbors as well.
+
+
+### Constrain
+
+```python
+def constrain_to_neighbor(self, cell: Cell, face: str):
+    old = len(self.possibilities)
+    self.possibilities = [
+        p
+        for p in self.possibilities[]
+        if compatible_sockets(my_face, p[my_face], cell[face])
+    ]
+    return old != len(self.possibilities)
+```
+
+Here we reduce the possiblity list to only include `Prototype`s that are compatible
+on the opposing face.
+
+There are far more efficient ways of doing this, like setting up an adjacency
+table. This is also the part of the algorithm that is most likely to have edge
+cases to help guide the algorithm's behavior to produce specific results.
+
+
+## Conclusion
+
+While this post was mostly psuedo code, it matches up pretty well to my first
+WFC attempt. The code is available
+[here](https://github.com/stevenctl/basic-wfc-blender) as well as a sample
+Blender file you can use to run it. This implementation has a lot of issues and
+isn't scalable, but I did find I use for it that's covered in a later post.
+
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+---
+title: Generating a 3D Tileset
+weight: 3
+---
+
+## Enumerating Tiles
+
+In the [last post](../01-marching-squares/), we built a basic autotiler for a 2D
+square grid. We will need a tileset before we can extend it to support a 3D cube
+grid. For each cell, there are now eight corners and therefore 2⁸ (256) possible
+ways to fill that cell.
+
+Rather than thinking in corners, I prefer to consider the octants after dividing
+the cube in half in each dimension. In the same way as before, we assign one bit
+of a now 8-bit integer to each octant.
+
+![bits per octant](bits.jpg)
+
+We can take an integer between `0` and `255` and convert it
+to or from a `2x2x2` array of "filled" or "empty".
+
+```python
+def int_to_cube(c_int: int) -> np.ndarray:
+    s = format(c_int, "#010b")
+    o = np.array([int(s[i]) for i in range(2, len(s))]).reshape((2, 2, 2))
+    return o
+
+def cube_to_int(cube: np.ndarray) -> int:
+    return int("".join(cube.reshape(8).astype(str)), 2)
+```
+
+We're using Python 3 with NumPy because `ndarray` is very convenient.
+This code doesn't need to run in our game engine and will end up
+being more useful in Blender scripts, which must be Python.
+
+Similar to 2D, many of cases are transformations of other cases. We can generate
+the unique cases pretty easily:
+
+```python
+def possible_tiles():
+    seen = set()
+    unique_cubes = set()
+
+    def add(cube, unique=False):
+        v = cube_to_int(cube)
+        if unique and v not in seen:
+            unique_cubes.add(v)
+        seen.add(v)
+
+    # skip 0 and 255 because they don't need a model
+    # they're empty and interior tiles
+    for i in range(1, 255):
+        if i not in seen:
+            unique_cubes.add(i)
+        seen.add(i)
+
+        # register the transformations as "seen"
+        # so that we will ignore them in future interations
+        rc = int_to_cube(i)
+        for rot in range(4):
+            rc = np.rot90(rc, axes=(0, 1), k=rot)
+            seen.add(cube_to_int(rc))
+            seen.add(cube_to_int(np.flip(rc, axis=1)))
+
+    return unique_cubes
+
+
+if __name__ == "__main__":
+    tiles = possible_tiles()
+    print(len(tiles))
+```
+
+53 unique cases. Not bad! We can safely ignore the `0` and `255` cases. Because
+0 is empty and 255 is completely on the interior, so we can't actually see it,
+there is no need to provide a model for them.
+
+## Generating Meshes
+
+// TODO blender script to place some cubes
+
+## Combining Handmande Meshes
+
+// TODO 26 subtiles to generate the rest
+// Should I figure out rotations or use WFC
+// Should I write a basic WFC post first using vertex data sockets?
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