Added the new explosion function based on the tnt one

mobs/morvalar.lua

@@ -363,7 +363,7 @@ mobs:register_mob("nssm:morvalar5", {
 			local p = self.attack:getpos()
 			minetest.after(2, function(self)
 				set_animation(self, "punch")
-				explosion(p, 5, 0, 1, true)
+				tnt_boom_nssm(p, {damage_radius=6,radius=5,ignore_protection=false})
 				self.morvalar5_timer = os.time()
 			end,self)
 		end
@@ -874,14 +874,14 @@ minetest.register_entity("nssm:kamehameha_bad", {
 		local objects = minetest.env:get_objects_inside_radius(pos, 1)
 		for _,obj in ipairs(objects) do
 			if obj:is_player() then
-				explosion(pos, 5, 0, 1, true)
+				tnt_boom_nssm(pos, {damage_radius=6,radius=5,ignore_protection=false})
 				self.object:remove()
 				minetest.chat_send_all("Dentro il raggio piccolo")
 			end
 			if obj:get_luaentity() then
 				local name = obj:get_luaentity().name
 				if name ~= "nssm:morvalar0" and name ~="nssm:kamehameha_bad" then
-					explosion(pos, 5, 0, 1, true)
+					tnt_boom_nssm(pos, {damage_radius=6,radius=5,ignore_protection=false})
 					self.object:remove()
 				end
 			end

nssm_api.lua

@@ -516,3 +516,368 @@ function midas_ability(		--ability to transform every blocks it touches in the m
 		end
 	end
 end
+
+
+
+--	NEW EXPLOSION FUNCTION
+
+-- loss probabilities array (one in X will be lost)
+local loss_prob = {}
+
+loss_prob["default:cobble"] = 3
+loss_prob["default:dirt"] = 4
+
+local tnt_radius = tonumber(minetest.setting_get("tnt_radius") or 3)
+
+local cid_data = {}
+minetest.after(0, function()
+	for name, def in pairs(minetest.registered_nodes) do
+		cid_data[minetest.get_content_id(name)] = {
+			name = name,
+			drops = def.drops,
+			flammable = def.groups.flammable,
+			on_blast = def.on_blast,
+		}
+	end
+end)
+
+local function rand_pos(center, pos, radius)
+	local def
+	local reg_nodes = minetest.registered_nodes
+	local i = 0
+	repeat
+		-- Give up and use the center if this takes too long
+		if i > 4 then
+			pos.x, pos.z = center.x, center.z
+			break
+		end
+		pos.x = center.x + math.random(-radius, radius)
+		pos.z = center.z + math.random(-radius, radius)
+		def = reg_nodes[minetest.get_node(pos).name]
+		i = i + 1
+	until def and not def.walkable
+end
+
+local function add_effects(pos, radius, drops)
+	minetest.add_particle({
+		pos = pos,
+		velocity = vector.new(),
+		acceleration = vector.new(),
+		expirationtime = 0.4,
+		size = radius * 10,
+		collisiondetection = false,
+		vertical = false,
+		texture = "tnt_boom.png",
+	})
+	minetest.add_particlespawner({
+		amount = 64,
+		time = 0.5,
+		minpos = vector.subtract(pos, radius / 2),
+		maxpos = vector.add(pos, radius / 2),
+		minvel = {x = -10, y = -10, z = -10},
+		maxvel = {x = 10, y = 10, z = 10},
+		minacc = vector.new(),
+		maxacc = vector.new(),
+		minexptime = 1,
+		maxexptime = 2.5,
+		minsize = radius * 3,
+		maxsize = radius * 5,
+		texture = "tnt_smoke.png",
+	})
+
+	-- we just dropped some items. Look at the items entities and pick
+	-- one of them to use as texture
+	local texture = "tnt_blast.png" --fallback texture
+	local most = 0
+	for name, stack in pairs(drops) do
+		local count = stack:get_count()
+		if count > most then
+			most = count
+			local def = minetest.registered_nodes[name]
+			if def and def.tiles and def.tiles[1] then
+				texture = def.tiles[1]
+			end
+		end
+	end
+
+	minetest.add_particlespawner({
+		amount = 64,
+		time = 0.1,
+		minpos = vector.subtract(pos, radius / 2),
+		maxpos = vector.add(pos, radius / 2),
+		minvel = {x = -3, y = 0, z = -3},
+		maxvel = {x = 3, y = 5,  z = 3},
+		minacc = {x = 0, y = -10, z = 0},
+		maxacc = {x = 0, y = -10, z = 0},
+		minexptime = 0.8,
+		maxexptime = 2.0,
+		minsize = radius * 0.66,
+		maxsize = radius * 2,
+		texture = texture,
+		collisiondetection = true,
+	})
+end
+
+local function eject_drops(drops, pos, radius)
+	local drop_pos = vector.new(pos)
+	for _, item in pairs(drops) do
+		local count = math.min(item:get_count(), item:get_stack_max())
+		while count > 0 do
+			local take = math.max(1,math.min(radius * radius,
+					count,
+					item:get_stack_max()))
+			rand_pos(pos, drop_pos, radius)
+			local dropitem = ItemStack(item)
+			dropitem:set_count(take)
+			local obj = minetest.add_item(drop_pos, dropitem)
+			if obj then
+				obj:get_luaentity().collect = true
+				obj:setacceleration({x = 0, y = -10, z = 0})
+				obj:setvelocity({x = math.random(-3, 3),
+						y = math.random(0, 10),
+						z = math.random(-3, 3)})
+			end
+			count = count - take
+		end
+	end
+end
+
+local function calc_velocity(pos1, pos2, old_vel, power)
+	-- Avoid errors caused by a vector of zero length
+	if vector.equals(pos1, pos2) then
+		return old_vel
+	end
+
+	local vel = vector.direction(pos1, pos2)
+	vel = vector.normalize(vel)
+	vel = vector.multiply(vel, power)
+
+	-- Divide by distance
+	local dist = vector.distance(pos1, pos2)
+	dist = math.max(dist, 1)
+	vel = vector.divide(vel, dist)
+
+	-- Add old velocity
+	vel = vector.add(vel, old_vel)
+
+	-- randomize it a bit
+	vel = vector.add(vel, {
+		x = math.random() - 0.5,
+		y = math.random() - 0.5,
+		z = math.random() - 0.5,
+	})
+
+	-- Limit to terminal velocity
+	dist = vector.length(vel)
+	if dist > 250 then
+		vel = vector.divide(vel, dist / 250)
+	end
+	return vel
+end
+
+local function entity_physics(pos, radius, drops)
+	local objs = minetest.get_objects_inside_radius(pos, radius)
+	for _, obj in pairs(objs) do
+		local obj_pos = obj:getpos()
+		local dist = math.max(1, vector.distance(pos, obj_pos))
+
+		local damage = (4 / dist) * radius
+		if obj:is_player() then
+			-- currently the engine has no method to set
+			-- player velocity. See #2960
+			-- instead, we knock the player back 1.0 node, and slightly upwards
+			local dir = vector.normalize(vector.subtract(obj_pos, pos))
+			local moveoff = vector.multiply(dir, dist + 1.0)
+			local newpos = vector.add(pos, moveoff)
+			newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
+			obj:setpos(newpos)
+
+			obj:set_hp(obj:get_hp() - damage)
+		else
+			local do_damage = true
+			local do_knockback = true
+			local entity_drops = {}
+			local luaobj = obj:get_luaentity()
+			local objdef = minetest.registered_entities[luaobj.name]
+			local name = luaobj.name
+
+			if objdef and objdef.on_blast then
+				if ((name == "nssm:pumpking") or (name == "nssm:morvalar0") or (name== "nssm:morvalar5")) then
+					do_damage = false
+					do_knockback = false
+				else
+					do_damage, do_knockback, entity_drops = objdef.on_blast(luaobj, damage)
+				end
+			end
+
+			if do_knockback then
+				local obj_vel = obj:getvelocity()
+				obj:setvelocity(calc_velocity(pos, obj_pos,
+						obj_vel, radius * 10))
+			end
+			if do_damage then
+				if not obj:get_armor_groups().immortal then
+					obj:punch(obj, 1.0, {
+						full_punch_interval = 1.0,
+						damage_groups = {fleshy = damage},
+					}, nil)
+				end
+			end
+			for _, item in pairs(entity_drops) do
+				add_drop(drops, item)
+			end
+		end
+	end
+end
+
+local function add_drop(drops, item)
+	item = ItemStack(item)
+	local name = item:get_name()
+	if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
+		return
+	end
+
+	local drop = drops[name]
+	if drop == nil then
+		drops[name] = item
+	else
+		drop:set_count(drop:get_count() + item:get_count())
+	end
+end
+
+local function destroy(drops, npos, cid, c_air, c_fire, on_blast_queue, ignore_protection, ignore_on_blast)
+	if not ignore_protection and minetest.is_protected(npos, "") then
+		return cid
+	end
+
+	local def = cid_data[cid]
+
+	if not def then
+		return c_air
+	elseif not ignore_on_blast and def.on_blast then
+		on_blast_queue[#on_blast_queue + 1] = {pos = vector.new(npos), on_blast = def.on_blast}
+		return cid
+	elseif def.flammable then
+		return c_fire
+	else
+		local node_drops = minetest.get_node_drops(def.name, "")
+		for _, item in pairs(node_drops) do
+			add_drop(drops, item)
+		end
+		return c_air
+	end
+end
+
+local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
+	pos = vector.round(pos)
+	-- scan for adjacent TNT nodes first, and enlarge the explosion
+	local vm1 = VoxelManip()
+	local p1 = vector.subtract(pos, 2)
+	local p2 = vector.add(pos, 2)
+	local minp, maxp = vm1:read_from_map(p1, p2)
+	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
+	local data = vm1:get_data()
+	local count = 0
+	local c_tnt = minetest.get_content_id("tnt:tnt")
+	local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
+	local c_tnt_boom = minetest.get_content_id("tnt:boom")
+	local c_air = minetest.get_content_id("air")
+
+	for z = pos.z - 2, pos.z + 2 do
+	for y = pos.y - 2, pos.y + 2 do
+		local vi = a:index(pos.x - 2, y, z)
+		for x = pos.x - 2, pos.x + 2 do
+			local cid = data[vi]
+			if cid == c_tnt or cid == c_tnt_boom or cid == c_tnt_burning then
+				count = count + 1
+				data[vi] = c_air
+			end
+			vi = vi + 1
+		end
+	end
+	end
+
+	vm1:set_data(data)
+	vm1:write_to_map()
+
+	-- recalculate new radius
+	radius = math.floor(radius * math.pow(count, 1/3))
+
+	-- perform the explosion
+	local vm = VoxelManip()
+	local pr = PseudoRandom(os.time())
+	p1 = vector.subtract(pos, radius)
+	p2 = vector.add(pos, radius)
+	minp, maxp = vm:read_from_map(p1, p2)
+	a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
+	data = vm:get_data()
+
+	local drops = {}
+	local on_blast_queue = {}
+
+	local c_fire = minetest.get_content_id("fire:basic_flame")
+	for z = -radius, radius do
+	for y = -radius, radius do
+	local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
+	for x = -radius, radius do
+		local r = vector.length(vector.new(x, y, z))
+		if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
+			local cid = data[vi]
+			local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
+			if cid ~= c_air then
+				data[vi] = destroy(drops, p, cid, c_air, c_fire,
+					on_blast_queue, ignore_protection,
+					ignore_on_blast)
+			end
+		end
+		vi = vi + 1
+	end
+	end
+	end
+
+	vm:set_data(data)
+	vm:write_to_map()
+	vm:update_map()
+	vm:update_liquids()
+
+	-- call nodeupdate for everything within 1.5x blast radius
+	for y = -radius * 1.5, radius * 1.5 do
+	for z = -radius * 1.5, radius * 1.5 do
+	for x = -radius * 1.5, radius * 1.5 do
+		local rad = {x = x, y = y, z = z}
+		local s = vector.add(pos, rad)
+		local r = vector.length(rad)
+		if r / radius < 1.4 then
+			nodeupdate_single(s)
+		end
+	end
+	end
+	end
+
+	for _, queued_data in pairs(on_blast_queue) do
+		local dist = math.max(1, vector.distance(queued_data.pos, pos))
+		local intensity = (radius * radius) / (dist * dist)
+		local node_drops = queued_data.on_blast(queued_data.pos, intensity)
+		if node_drops then
+			for _, item in pairs(node_drops) do
+				add_drop(drops, item)
+			end
+		end
+	end
+
+	return drops, radius
+end
+
+function tnt_boom_nssm(pos, def)
+	minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
+	minetest.set_node(pos, {name = "tnt:boom"})
+	local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
+			def.ignore_on_blast)
+	-- append entity drops
+	local damage_radius = (radius / def.radius) * def.damage_radius
+	entity_physics(pos, damage_radius, drops)
+	if not def.disable_drops then
+		eject_drops(drops, pos, radius)
+	end
+	add_effects(pos, radius, drops)
+end

nssm_materials.lua

@@ -368,7 +368,7 @@ minetest.register_node("nssm:pumpbomb", {
 	groups = {not_in_creative_inventory =1},
 	drop = "",
 	on_timer = function(pos, elapsed)
-		tnt.boom(pos, {damage_radius=4,radius=3,ignore_protection=false})
+		tnt_boom_nssm(pos, {damage_radius=4,radius=3,ignore_protection=false})
 		minetest.env:set_node(pos, {name="air"})
 	end,
 })