Obsidian fully updated, added group "fastness" for very strong things as obsidian

new_api/obsidian_rtmmp/depends.txt

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+default

new_api/obsidian_rtmmp/init.lua

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+-- Obsidian mod, originally made by <???>
+-- modifed by rtmmp-team
+
+minetest.register_node("obsidian_rtmmp:obsidian_block", {
+	description="Obsidian",
+	tile_images = {"obsidian_rtmmp_block.png"},
+	inventory_image = minetest.inventorycube("obsidian_rtmmp_block.png"),
+	is_ground_content = true,
+	is_ground_content = true,
+	groups = {fastness = 1, level = 3},
+	sounds = default.node_sound_stone_defaults(),
+	drop = {
+		max_items = 1,
+		items = {
+			{
+				 items = {"obsidian_rtmmp:obsidian_block"},
+				 tools = {"default:pick_mese"},
+			}
+		 }
+	}
+})
+
+local function check_water(pos, dx, dy, dz)
+	local n = minetest.env:get_node({x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}) 
+	return n.name == "default:water_flowing" or n.name == "default:water_source"
+end
+
+local function find_water(pos)
+	return check_water(pos, -1, 0, 0) or check_water(pos, 1, 0, 0)
+		or check_water(pos, 0, -1, 0) or check_water(pos, 0, 1, 0)
+		or check_water(pos, 0, 0, -1) or check_water(pos, 0, 0, 1)
+end
+
+local function replace(pos, dx, dy, dz)
+	if check_water(pos, dx, dy, dz) then
+		minetest.env:remove_node({x = pos.x + dx, y = pos.y + dy, z = pos.z + dz})
+	end
+end
+
+local function replace_water(pos)
+	replace(pos, -1, 0, 0)
+	replace(pos, 1, 0, 0)
+	replace(pos, 0, -1, 0)
+	replace(pos, 0, 1, 0)
+	replace(pos, 0, 0, -1)
+	replace(pos, 0, 0, 1)
+end
+
+minetest.register_abm({
+	nodenames = {"default:lava_flowing"},
+	neighbors = {"default:water_source", "default:water_flowing"},
+	interval = 1,
+	chance = 1,
+	action = function(pos, node)
+		if find_water(pos) then
+			replace_water(pos)
+			minetest.env:add_node(pos, {name="default:cobble"})
+		end
+	end
+})
+
+minetest.register_abm({
+	nodenames = {"default:lava_source"},
+	neighbors = {"default:water_source", "default:water_flowing"},
+	interval = 1,
+	chance = 1,
+	action = function(pos, node)
+		if find_water(pos) then
+			replace_water(pos)
+			minetest.env:add_node(pos, {name="obsidian_rtmmp:obsidian_block"})
+		end
+	end
+})