function sinsin(x, z)
	return math.floor((math.sin(x / 2.5) * math.sin(z / 2.5) + 1.0) * 15.0 + 0.49)
end

prov = pcons_surface.getSurfaceProvider(20, 20, sinsin)
pcons.setSkipEmptyBlocks(true)
pcons.run(prov, 5, 0, 0)

