SetObs

Changes the obstruction tile index at the given coords to the given obstruction type.

Note: Coordinates are in terms of tiles, not pixels. In order to convert tiles to pixels do: (pixel coordinate / 16).

// Set the obstruction tile at (5, 2) to obstruction tile 1.

// Obstruction tile one, is commonly a fully filled 16 x 16 tile, thus preventing
// any entry onto that coordinate.

SetObs(5, 2, 1);