- doDiamondStep
Will fill the cell at (x+stepSize/2, y) with the average of the 4 corners of the
diamond centered on
- doSquareStep
Will fill the value at (coords[0]+stepSize/2, coords[1]+stepSize/2) with the
average from the corner
- getOffset
Generate a random value to add to the computed average
- load
Generate the heightmap.
- setHeightAtPoint
- unloadHeightMap