blah.lua

local floor = math.floor
local ceil = math.ceil
local max = math.max
local min = math.min
local cos = math.cos
local pi = math.pi
local sqrt = math.sqrt
local terrain = workspace.Terrain

function smoothSphere(centerPoint,radius,material,resolution)
	local resolution = resolution or 4
    local minBounds = Vector3.new(
		floor((centerPoint.x - radius) / resolution) * resolution,
		floor((centerPoint.y - radius) / resolution) * resolution,
		floor((centerPoint.z - radius) / resolution) * resolution
	)
	
	local maxBounds = Vector3.new(
			ceil((centerPoint.x + radius) / resolution) * resolution,
			ceil((centerPoint.y + radius) / resolution) * resolution,
			ceil((centerPoint.z + radius) / resolution) * resolution
		)
	
	local region = Region3.new(minBounds, maxBounds)
	local materials, occupancies = terrain:ReadVoxels(region, resolution)
	
	for ix, vx in ipairs(occupancies) do
		local cellVectorX = minBounds.x + (ix - .5) * resolution - centerPoint.x
	
		for iy, vy in pairs(vx) do
			local cellVectorY = minBounds.y + (iy - .5) * resolution - centerPoint.y
	
			for iz, cellOccupancy in pairs(vy) do
				local cellVectorZ = minBounds.z + (iz - .5) * resolution - centerPoint.z
				
				local cellMaterial = materials[ix][iy][iz]
				local distance = sqrt(cellVectorX * cellVectorX + cellVectorY * cellVectorY + cellVectorZ * cellVectorZ)
	
				local magnitudePercent = cos(min(1, distance / (radius + resolution * .5)) * pi * .5)
				local brushOccupancy = max(0, min(1, (radius + .5 * resolution - distance) / resolution))
	
				if brushOccupancy > cellOccupancy then
					occupancies[ix][iy][iz] = brushOccupancy
				end
				
				if brushOccupancy >= .5 and cellMaterial == Enum.Material.Air then
					materials[ix][iy][iz] = material
				end
			end
		end
	end

	terrain:WriteVoxels(region,4,materials,occupancies)
end