I am struggling to create trees in a randomly generated world

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#1

The thing I am doing is generating trees by creating a raycast into the sky, so that way nothing obstructs the tree for a realystic generation, but the raycast ignores blocks and makes the trees clip into mountains and hills.

local BLOCK_SIZE = 3.054
local MAP_SIZE = Vector3.new(100, 64, 100)
local MOUNTAIN_INTENSITY = 8

seed = workspace.SEED.Value
noisescale = 1/64
amplitude = 10

function get_density(v3)
	local noise_value = math.noise(v3.X * noisescale, v3.Y * noisescale, v3.Z * noisescale + seed)*amplitude
	local height_bonus = -v3.Y / MOUNTAIN_INTENSITY + 8

	return noise_value + height_bonus
end

function is_on_boundary(v3)
	if get_density(v3) <= 0 then
		return false
	end

	for _, dirEnum in pairs(Enum.NormalId:GetEnumItems()) do
		local dir = Vector3.FromNormalId(dirEnum)
		local neighbor_pos = v3 + dir * BLOCK_SIZE
		local neighbor_density = get_density(neighbor_pos)

		if neighbor_density <= 0 then
			return true
		end
	end

	return false
end

for x = 0, MAP_SIZE.X do
	for y = 0, MAP_SIZE.Y do
		for z = 0, MAP_SIZE.Z do
			local block_pos = Vector3.new(x, y, z) * BLOCK_SIZE
			local density = get_density(block_pos)

			if density > 0 and is_on_boundary(block_pos) then
				local block = script.Block:Clone()
				block.Parent = game.Workspace
				block.CFrame = CFrame.new(block_pos)
				if y > 25 then
					local c = game.ReplicatedStorage.Blocks.Nature.Snow:Clone()
					c:SetPrimaryPartCFrame(block.CFrame)
					c.Parent = workspace.TerrainFolder
					block:Destroy()
				elseif y < 23 and y > 10 then
					local c = game.ReplicatedStorage.Blocks.Nature.Grass:Clone()
					c:SetPrimaryPartCFrame(block.CFrame)
					c.Parent = workspace.TerrainFolder
					block:Destroy()
					
					local startPos = c.Grass.Position
					local finishPos = Vector3.new(c.Dirt.Position.X, c.Dirt.Position.Y + 10000, c.Dirt.Position.Z) 
					
					local rayDirection = finishPos - startPos
					
					local trees = game.ReplicatedStorage.Structures.Trees:GetChildren()
					
					local ray = Ray.new(startPos, rayDirection)

					local hit = workspace:Raycast(startPos, finishPos)
					
					if math.random(1, 150) == 1 and hit == nil then
						local tree = trees[math.random(1, #trees)]:Clone()
						tree.Parent = workspace.TerrainFolder.Trees
						tree:SetPrimaryPartCFrame(c.PrimaryPart.CFrame)
					end
					
					if hit == nil then
						print("Nothing obstructed the tree!")
					else
						print(hit.Position)
					end
					
				elseif y <= 10 then
					local p = Instance.new("Part")
					p.Parent = workspace.TerrainFolder
					p.Size = Vector3.new(3.054, 0.005, 3.054)
					p.Anchored = true
					p.CanCollide = false
					p.Transparency = 0.01
					p.Reflectance = 0.1
					p.CFrame = CFrame.new(block.CFrame.X, 30, block.CFrame.Z)
					p.Material = Enum.Material.SmoothPlastic
					p.Name = "Water"
					p.BrickColor = BrickColor.new("Electric blue")
					
					local c = game.ReplicatedStorage.Blocks.Nature.Sand:Clone()
					c:SetPrimaryPartCFrame(block.CFrame)
					c.Parent = workspace.TerrainFolder
					block:Destroy()
				else
					local c = game.ReplicatedStorage.Blocks.Nature.Stone:Clone()
					c:SetPrimaryPartCFrame(block.CFrame)
					c.Parent = workspace.TerrainFolder
					block:Destroy()
				end
			end
			
		end
	end
	wait(0.2)
end

Anything I could do? Something to fix?

#2

check if the region3 of where the tree will go would work, if it returns other land then dont add the tree
Region3 (roblox.com)

#3

Elaborate please.⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

#4

ok ill try, so the basic idea is that you would first create a region 3, and a hitbox for the tree though it is possible without its just harder. you could also use this but region 3 is faster and doesnt require a part being in the workspace.

local Point1 = Hitbox.Position - Hitbox.Size -- im not great with region3 so this may be wrong
local Point2 = Hitbox.Position + Hitbox.Size
local Region = Region3.new(Point1,Point2)
local touching = game.Workspace:FindPartsInRegion3(Region,Hitbox,math.huge) -- table with parts in region3, ignoring hitbox

you would then loop through the touching to see if its touching something that it shouldnt.

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