From 4c8b0824181f05aa5611a1e077f999788f575c42 Mon Sep 17 00:00:00 2001
From: Xertis <118364459+Xertis@users.noreply.github.com>
Date: Tue, 18 Feb 2025 21:54:18 +0300
Subject: [PATCH 1/3] fix caves generation

---
 res/content/base/generators/demo.files/script.lua | 1 +
 1 file changed, 1 insertion(+)

diff --git a/res/content/base/generators/demo.files/script.lua b/res/content/base/generators/demo.files/script.lua
index 9a995224..7df69c30 100644
--- a/res/content/base/generators/demo.files/script.lua
+++ b/res/content/base/generators/demo.files/script.lua
@@ -1,5 +1,6 @@
 local _, dir = parse_path(__DIR__)
 local ores = require "base:generation/ores"
+math.randomseed(SEED)
 ores.load(dir)
 
 function place_structures(x, z, w, d, hmap, chunk_height)

From 79cd2b45b751cf3fd15ef60e2ef613f585897493 Mon Sep 17 00:00:00 2001
From: Xertis <118364459+Xertis@users.noreply.github.com>
Date: Wed, 19 Feb 2025 09:54:15 +0300
Subject: [PATCH 2/3] fix caves generation x2

---
 .../base/generators/demo.files/script.lua     | 44 ++++++++++++++-----
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/res/content/base/generators/demo.files/script.lua b/res/content/base/generators/demo.files/script.lua
index 7df69c30..978d20be 100644
--- a/res/content/base/generators/demo.files/script.lua
+++ b/res/content/base/generators/demo.files/script.lua
@@ -3,6 +3,28 @@ local ores = require "base:generation/ores"
 math.randomseed(SEED)
 ores.load(dir)
 
+local function get_rand(seed, x, y, z)
+    local h = bit.bxor(bit.bor(x * 23729, y % 16786), y * x + seed)
+    h = bit.bxor(h, z * 47917)
+    h = bit.bxor(h, bit.bor(z % 12345, x + y))
+
+    local n = (h % 10000) / 10000.0
+
+    return n
+end
+
+local function gen_parameters(size, seed, x, y)
+    local res = {}
+    local rand = 0
+
+    for i=1, size do
+        rand = get_rand(seed, x, y, rand)
+        table.insert(res, rand)
+    end
+
+    return res
+end
+
 function place_structures(x, z, w, d, hmap, chunk_height)
     local placements = {}
     ores.place(placements, x, z, w, d, SEED, hmap, chunk_height)
@@ -11,15 +33,17 @@ end
 
 function place_structures_wide(x, z, w, d, chunk_height)
     local placements = {}
-    if math.random() < 0.05 then -- generate caves
-        local sx = x + math.random() * 10 - 5
-        local sy = math.random() * (chunk_height / 4) + 10
-        local sz = z + math.random() * 10 - 5
+    local rands = gen_parameters(11, SEED, x, z)
+    if rands[1] < 0.05 then -- generate caves
 
-        local dir = math.random() * math.pi * 2
-        local dir_inertia = (math.random() - 0.5) * 2
+        local sx = x + rands[2] * 10 - 5
+        local sy = rands[3] * (chunk_height / 4) + 10
+        local sz = z + rands[4] * 10 - 5
+
+        local dir = rands[5] * math.pi * 2
+        local dir_inertia = (rands[6] - 0.5) * 2
         local elevation = -3
-        local width = math.random() * 3 + 2
+        local width = rands[7] * 3 + 2
 
         for i=1,18 do
             local dx = math.sin(dir) * 10
@@ -35,11 +59,11 @@ function place_structures_wide(x, z, w, d, chunk_height)
             sx = ex
             sy = ey
             sz = ez
-            
+
             dir_inertia = dir_inertia * 0.8 + 
-                (math.random() - 0.5) * math.pow(math.random(), 2) * 8
+                (rands[8] - 0.5) * math.pow(rands[10], 2) * 8
             elevation = elevation * 0.9 + 
-                (math.random() - 0.4) * (1.0-math.pow(math.random(), 4)) * 8
+                (rands[9] - 0.4) * (1.0-math.pow(rands[11], 4)) * 8
             dir = dir + dir_inertia
         end
     end

From c5d1e25b7b0d83a4752fb01d9313b4ac476b2afd Mon Sep 17 00:00:00 2001
From: Xertis <118364459+Xertis@users.noreply.github.com>
Date: Wed, 19 Feb 2025 09:56:36 +0300
Subject: [PATCH 3/3] correction order

---
 res/content/base/generators/demo.files/script.lua | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/res/content/base/generators/demo.files/script.lua b/res/content/base/generators/demo.files/script.lua
index 978d20be..7a3282c3 100644
--- a/res/content/base/generators/demo.files/script.lua
+++ b/res/content/base/generators/demo.files/script.lua
@@ -61,9 +61,9 @@ function place_structures_wide(x, z, w, d, chunk_height)
             sz = ez
 
             dir_inertia = dir_inertia * 0.8 + 
-                (rands[8] - 0.5) * math.pow(rands[10], 2) * 8
+                (rands[8] - 0.5) * math.pow(rands[9], 2) * 8
             elevation = elevation * 0.9 + 
-                (rands[9] - 0.4) * (1.0-math.pow(rands[11], 4)) * 8
+                (rands[10] - 0.4) * (1.0-math.pow(rands[11], 4)) * 8
             dir = dir + dir_inertia
         end
     end