finally getting a handle on the lava.

biomes/lava_sea.lua

@@ -13,27 +13,55 @@ local c_cavern_fungi = minetest.get_content_id("dfcaverns:cavern_fungi") -- para
 
 -------------------------------------------------------------------------------------------
 
-local subsea_level = (dfcaverns.config.lava_sea_min - dfcaverns.config.level3_min) * 0.3 + dfcaverns.config.level3_min
-minetest.debug("level3_min", dfcaverns.config.level3_min)
-minetest.debug("lava subsea", subsea_level)
-minetest.debug("lava_sea_min", dfcaverns.config.lava_sea_min)
-
 minetest.register_biome({
-	name = "dfcaverns_lava_sea_lower",
+	name = "dfcaverns_lava_sea",
 	y_min = dfcaverns.config.lava_sea_min,
-	y_max = subsea_level,
-	heat_point = 50,
-	humidity_point = 50,
-	_subterrane_fill_node = c_lava,
-	_subterrane_cave_fill_node = c_lava,
-})
-
-minetest.register_biome({
-	name = "dfcaverns_lava_sea_upper",
-	y_min = subsea_level,
 	y_max = dfcaverns.config.level3_min,
 	heat_point = 50,
 	humidity_point = 50,
-	_subterrane_fill_node = c_air,
-	_subterrane_cave_fill_node = c_lava,
 })
+
+local airspace = 256
+
+local data = {}
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	--if out of range of cave definition limits, abort
+	if minp.y > dfcaverns.config.level3_min - airspace or maxp.y < dfcaverns.config.lava_sea_min then
+		return
+	end
+		
+	--easy reference to commonly used values
+	local t_start = os.clock()
+	local x_max = maxp.x
+	local y_max = maxp.y
+	local z_max = maxp.z
+	local x_min = minp.x
+	local y_min = minp.y
+	local z_min = minp.z
+		
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+	vm:get_data(data)
+		
+	for z = z_min, z_max do -- for each xy plane progressing northwards
+		--structure loop, hollows out the cavern
+		for y = y_min, y_max do -- for each x row progressing upwards
+			local vi = area:index(x_min, y, z) --current node index
+			for x = x_min, x_max do -- for each node do
+				if data[vi] == c_air or data[vi] == c_water then
+					data[vi] = c_lava
+				end
+				vi = vi + 1
+			end
+		end
+	end
+		
+	--send data back to voxelmanip
+	vm:set_data(data)
+	--calc lighting
+	vm:set_lighting({day = 0, night = 0})
+	vm:calc_lighting()
+	--write it to world
+	vm:write_to_map(data)
+end)