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lib_materials_rivers.lua

@@ -0,0 +1,124 @@
+
+
+
+local neighbors_p = {
+					{x=1},{x=-1},
+					{z=1},{z=-1}
+					}
+
+local neighbors_p2 = {
+					{x=2},{x=-2},
+					{z=2},{z=-2}
+					}
+
+local neighbors_d = {
+					{x=1,z=1},
+					{x=1,z=-1},
+					{x=-1,z=1},
+					{x=-1,z=-1}
+					}
+
+local pos_shift = function(pos,vec)
+	vec.x=vec.x or 0
+	vec.y=vec.y or 0
+	vec.z=vec.z or 0
+	return {x=pos.x+vec.x,
+			y=pos.y+vec.y,
+			z=pos.z+vec.z}
+end
+
+local get_nodename_off = function(pos,vec)
+	return minetest.get_node(pos_shift(pos,vec)).name
+end
+
+local get_neighbors_walkable = function(pos)
+	local ret = 0
+	for _,v in ipairs(neighbors_p) do
+		if minetest.registered_nodes[get_nodename_off(pos,v)].walkable then
+			ret = ret+1
+		end
+	end
+	return ret
+end
+
+minetest.register_abm({
+	label="Erosion_crumb",
+	nodenames = {"group:crumbly","group:snowy"},
+	neighbors = {"lib_materials:liquid_water_rushing_flowing", "lib_materials:liquid_water_rushing_source"},
+	interval = 0.2,
+    chance = 1,
+	catch_up = false,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+
+		local node1up = get_nodename_off(pos,{y=1})
+		if minetest.registered_nodes[node1up].drawtype == "flowingliquid" then
+			if get_neighbors_walkable(pos) < 4 then
+				minetest.remove_node(pos)
+				for _,v in ipairs(neighbors_p) do
+					local node = get_nodename_off(pos,v)
+					local v2=table.copy(v)
+					v2.y = v2.y+1
+					local node2 = get_nodename_off(pos,v2)
+					if (minetest.get_item_group(node,"crumbly")>0 or
+					minetest.get_item_group(node,"snowy")>0) and not
+					minetest.registered_nodes[node2].walkable then
+						minetest.remove_node(pos_shift(pos,v))
+						minetest.remove_node(pos_shift(pos,v2))
+					end
+				end
+			end
+		end
+	end
+})
+
+minetest.register_abm({
+	label="Erosion_stone",
+	nodenames = {"group:stone","default:ice"},
+	neighbors = {"lib_materials:liquid_water_rushing_source"},
+	interval = 1,
+    chance = 2,
+	catch_up = false,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+	
+		local node2up = minetest.get_node(pos_shift(pos,{y=2}))
+		local node1up = minetest.get_node(pos_shift(pos,{y=1}))
+		
+		if pos.y % 4 ~= 0 then
+			if minetest.registered_nodes[node1up.name].drawtype == "liquid" and
+			get_neighbors_walkable(pos) <= 2 then
+				minetest.remove_node(pos)
+				return
+			end
+		end
+		
+		if minetest.registered_nodes[node2up.name].drawtype ~= "liquid" and
+			minetest.registered_nodes[node1up.name].drawtype == "liquid" then
+			local node
+			local vec
+			
+			for _,v in ipairs(neighbors_p) do
+				node = minetest.get_node(pos_shift(pos,v))
+				if minetest.registered_nodes[node.name].drawtype == "liquid" then
+					vec = {x=v.x*-1,y=v.y+1,z=v.z*-1}
+					node = minetest.get_node(pos_shift(pos,vec))
+					if minetest.registered_nodes[node.name].walkable then
+						minetest.remove_node(pos)
+						return
+					end
+				end
+			end
+		end
+	end
+})
+
+minetest.register_abm({
+	label="Erosion_flora",
+	nodenames = {"group:attached_node"},
+	neighbors = {"lib_materials:liquid_water_rushing_flowing", "lib_materials:liquid_water_rushing_source"},
+	interval = 0.2,
+    chance = 1,
+	catch_up = false,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		minetest.remove_node(pos)
+	end
+})