Vein Feature Generator

The vein feature generator attempts to spawn a long, snaking "vein" of an ore in the world. It does this by choosing a starting point in a chunk, picking a direction to go and "simulating" a walk for the length of the vein, at each step deciding on a somewhat random new direction to move in. It then goes back and at each of those single block steps tries to generate a small node of the specified block(s).

As no canonical example of this generator exists, here are the parameters it takes and an explanation of them:

• minHeight - the minimum Y level a vein can spawn at or reach
• maxHeight - the maximum Y level a vein can spawn at or reach
• variation - the amount of variation in the size of the "node" generated at each "step" of the vein as well as the difference in length of the vein, should be smaller than or equal to size
• frequency - how frequently the feature will be generated
• minAttempts - minimum number of times to try and generate this feature
• maxAttempts - maximum number of times to try and generate this feature
• length - mean length of any given vein
• startFacing - which direction will the vein prefer to head in on spawn ? ("UP", "DOWN", "NORTH", "SOUTH", "EAST", "WEST", "RANDOM" (randomly choose), "VERTICAL" (choose either up or down randomly), "HORIZONTAL" (choose any but "UP" or "DOWN" randomly)
• size - how many blocks will spawn as a "node" of the vein at each "step" along its length ?