From 98bba5468aed6f7577eb749d6fa3176f3f8a4875 Mon Sep 17 00:00:00 2001
From: Mat <mat.gregory@virginmedia.com>
Date: Sat, 14 Jun 2014 03:30:18 +0100
Subject: [PATCH] First commit

---
 README.txt                       |   4 ++
 depends.txt                      |   1 +
 init.lua                         | 107 +++++++++++++++++++++++++++++++
 license.txt                      |  14 ++++
 textures/intersecting_luxore.png | Bin 0 -> 688 bytes
 5 files changed, 126 insertions(+)
 create mode 100644 README.txt
 create mode 100644 depends.txt
 create mode 100644 init.lua
 create mode 100644 license.txt
 create mode 100644 textures/intersecting_luxore.png

diff --git a/README.txt b/README.txt
new file mode 100644
index 0000000..67c2943
--- /dev/null
+++ b/README.txt
@@ -0,0 +1,4 @@
+intersection 0.1.0 by paramat
+For latest stable Minetest back to 0.4.8
+Depends default
+Licenses: code WTFPL
diff --git a/depends.txt b/depends.txt
new file mode 100644
index 0000000..4ad96d5
--- /dev/null
+++ b/depends.txt
@@ -0,0 +1 @@
+default
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..25aead1
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,107 @@
+-- intersecting 0.1.0 by paramat
+-- For latest stable Minetest and back to 0.4.8
+-- Depends default
+-- License: code WTFPL
+
+-- TODO
+-- enables 1-3 fissures, isolated tunnels and intersecting tunnels, also isolated tunnel plus 1 fissure
+
+-- Parameters
+
+local TFIS = 0.02
+
+-- 3D noise for 
+
+local np_weba = {
+	offset = 0,
+	scale = 1,
+	spread = {x=192, y=192, z=192},
+	seed = 5900033,
+	octaves = 3,
+	persist = 0.6
+}
+
+-- 3D noise for 
+
+local np_webb = {
+	offset = 0,
+	scale = 1,
+	spread = {x=191, y=191, z=191},
+	seed = 33,
+	octaves = 3,
+	persist = 0.6
+}
+
+-- 3D noise for 
+
+local np_webc = {
+	offset = 0,
+	scale = 1,
+	spread = {x=190, y=190, z=190},
+	seed = -18000001,
+	octaves = 3,
+	persist = 0.6
+}
+
+-- Stuff
+
+intersecting = {}
+
+-- On generated function
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	if minp.y > 48 then
+		return
+	end
+
+	local t1 = os.clock()
+	local x1 = maxp.x
+	local y1 = maxp.y
+	local z1 = maxp.z
+	local x0 = minp.x
+	local y0 = minp.y
+	local z0 = minp.z
+	
+	print ("[interasecting] chunk minp ("..x0.." "..y0.." "..z0..")")
+	
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+	local data = vm:get_data()
+	
+	local c_air = minetest.get_content_id("air")
+	
+	local sidelen = x1 - x0 + 1
+	local chulens = {x=sidelen, y=sidelen, z=sidelen}
+	local minposxyz = {x=x0, y=y0, z=z0}
+	local minposxz = {x=x0, y=z0}
+	
+	local nvals_weba = minetest.get_perlin_map(np_weba, chulens):get3dMap_flat(minposxyz)
+	local nvals_webb = minetest.get_perlin_map(np_webb, chulens):get3dMap_flat(minposxyz)
+	local nvals_webc = minetest.get_perlin_map(np_webc, chulens):get3dMap_flat(minposxyz)
+	
+	local nixyz = 1
+	for z = z0, z1 do -- for each xy plane progressing northwards
+		for y = y0, y1 do -- for each x row progressing upwards
+			local vi = area:index(x0, y, z)
+			for x = x0, x1 do -- for each node do
+				local nodid = data[vi]
+				local weba = math.abs(nvals_weba[nixyz]) < TFIS
+				local webb = math.abs(nvals_webb[nixyz]) < TFIS
+				local webc = math.abs(nvals_webc[nixyz]) < TFIS
+				if (weba and webb) or (weba and webc) 
+				and nodid ~= c_water then
+					data[vi] = c_air
+				end
+				nixyz = nixyz + 1
+				vi = vi + 1
+			end
+		end
+	end
+	
+	vm:set_data(data)
+	vm:set_lighting({day=0, night=0})
+	vm:calc_lighting()
+	vm:write_to_map(data)
+	local chugent = math.ceil((os.clock() - t1) * 1000)
+	print ("[intersecting] "..chugent.." ms")
+end)
diff --git a/license.txt b/license.txt
new file mode 100644
index 0000000..c73f8ae
--- /dev/null
+++ b/license.txt
@@ -0,0 +1,14 @@
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+                       
diff --git a/textures/intersecting_luxore.png b/textures/intersecting_luxore.png
new file mode 100644
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