🦉How does this work

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createTerrain function does these things:

1. creates tiles variable which is 2 dimensional array with elements like this: {faces, vertices}
2. creates vertices
3. creates faces and assigns appropriate vertices to them
4. creates uvs
5. do some updating magic on Geometry object
6. creates few helpers functions
7. returns object with some methods (public API)

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computeIndexes function takes x and y arguments (tile coordinates) and returns object with 5 vertex indices that form this tile.