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-- @CloneTrooper1019, 2015 , Shyvha , 2017
-- Infinite Smooth Canyon Generator :3
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-- CONFIGURATION:
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baseHeight = 10
-- ^ The main height factor for the terrain.

mountainHeight = 12
-- ^ How tall should mountains be relative to the baseHeight of the terrain

mountainMaterialWeight = 0.4
-- ^ The chance that a mountain terrain chunk will generate using slate rather than rock
--    Should be a number between 0 and 1
--    0 = only rock, 1 = only slate, 0.5 = half n half
canyonMaterialDensity = 0.1
-- ^ The limestone rarity
-- 0 = No Limestone at all , 1 = Only limestone (NOT RECOMMANDED) , 0.2 = small bumps (Realist)
-- Note that limestone is not very different from sand, but it adds some realism
chunkScale = 4
-- ^ The grid scale for terrain generation.

renderDist = 90
-- ^ The length/width of chunks in voxels that should be around the player at all times

xScale = 30
-- ^ How much we should strech the X scale of the generation noise

zScale = 30
-- ^ How much we should strech the Z scale of the generation noise

waterLevel = -0.9
-- ^ Determines if we should generate ponds if the height level goes below this
--    Should be a number between -1 and 1
--    -1 = no water, 0 = all grass levels are filled with water, 1 = The entire map is flooded with water (Except for tall mountains)

seed = math.random()
-- ^ Seed for determining the height map of the terrain.
--    By default its random.

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local chunks = {}

function chunkExists(chunkX,chunkZ)
        if not chunks[chunkX] then
                chunks[chunkX] = {}
        end
        return chunks[chunkX][chunkZ]
end

function fillSmoothBlock(x,z,begY,endY,material)
        local location = CFrame.new(x*4+2, (begY+endY)*4/2, z*4+2)
        local fill = Vector3.new(4, (endY-begY)*4, 4)
        workspace.Terrain:FillBlock(location,fill,material)
end

function mountLayer(x,heightY,z,material)
        -- Fill in Lakes/Ponds
        local waterFill = baseHeight * waterLevel
        if heightY < waterFill then
                material = Enum.Material.Sand -- Make the material sand.
                fillSmoothBlock(x,z,heightY-2,waterFill,Enum.Material.Water) -- Fill some water in.
        end
        -- Fill in the main terrain.
        fillSmoothBlock(x,z,-baseHeight,heightY,material)
end

function makeChunk(chunkX,chunkZ)
        local rootPos = Vector3.new(chunkX*chunkScale,0,chunkZ*chunkScale)
        chunks[chunkX][chunkZ] = true -- Acknowledge the chunk's existance.
        for x = 0,chunkScale-1 do
                for z = 0,chunkScale-1 do
                        local cx = (chunkX*chunkScale) + x
                        local cz = (chunkZ*chunkScale) + z
                        local noise = math.noise(seed,cx/xScale,cz/zScale)
                        local isMountain = (noise > 0)
                        local material,materialScale do
                                if not isMountain then
                                        material = Enum.Material.Sand
                                        materialScale = 1
                                else
                                       	materialScale = mountainHeight
                                        if math.random() > mountainMaterialWeight then
                                                material = Enum.Material.Sandstone
                                        else
											if math.random() > canyonMaterialDensity then
                                                material = Enum.Material.Basalt
											else
												material = Enum.Material.Rock
											end
                                        end
                                end
                        end
                        local cy = noise*baseHeight*materialScale
                        mountLayer(cx,cy,cz,material)
                end
        end
end

function doAreaFill(location)
        local chunkX,chunkZ = math.floor(location.X/4/chunkScale),math.floor(location.Z/4/chunkScale)
        local range = math.max(1,renderDist/chunkScale)
        for x = -range,range do
                for z = -range,range do
                        local cx,cz = chunkX + x,chunkZ + z
                        if not chunkExists(cx,cz) then
                                makeChunk(cx,cz)
                        end
                end
        end
end

while true do
        for _,v in pairs(game.Players:GetPlayers()) do
                spawn(function ()
                        local char = v.Character
                        if char then
                                local torso = char:findFirstChild("Torso")
                                if torso then
                                        doAreaFill(torso.Position)
                                end
                        end
                end)
        end
        wait(1)
end

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--Thanks for CloneTrooper1019 for the main script
--I scripted the sand to be up there.
--WIP