_

scripts/portalgun.lua

@@ -432,7 +432,22 @@ minetest.register_craftitem(
             if pointed_thing.type == "node" then
                 local node = minetest.get_node(pointed_thing.under)
                 if node.name == "portalgun:turretgun" or node.name == "portalgun:turretgun2" then
-                    minetest.remove_node(pointed_thing.under)
+                    --if 4 blocks or closer to player
+                    local pos = user:getpos()
+                    local pos2 = pointed_thing.under
+                    local dist = math.sqrt(
+                        (pos.x - pos2.x) * (pos.x - pos2.x) +
+                            (pos.y - pos2.y) * (pos.y - pos2.y) +
+                            (pos.z - pos2.z) * (pos.z - pos2.z)
+                    )
+                    if dist < 4 then
+                        --set the node to air
+                        minetest.set_node(pointed_thing.under, {name = "air"})
+                        --create entity
+                        local pos_tmp = pointed_thing.under
+                        local obj = minetest.add_entity(pos_tmp, "portalgun:turret_held")
+                        --set the turret to the user
+                    end
                 end
             end
             portalgun_onuse(itemstack, user, pointed_thing, 1)

scripts/turrets.lua

@@ -87,6 +87,52 @@ minetest.register_node(
     }
 )
 
+minetest.register_entity(
+	"portalgun:turret_held",
+	{
+		hp_max = 1000,
+		physical = true,
+		weight = 5,
+		visual = "mesh",
+		visual_size = {x = 10, y = 10},
+		mesh = "turret2.obj",
+		textures = {"portalgun_sentry_turret.png"},
+		is_visible = true,
+		makes_footstep_sound = true,
+		automatic_rotate = 1,
+		portalgun = 2,
+		on_step = function(self, dtime)
+			--if not held and on ground then transform to turret
+			self.object:set_acceleration({x = 0, y = -10, z = 0})
+			if self.held == false then
+				--check if on ground
+				local pos = self.object:get_pos()
+				pos = {x = math.floor(pos.x), y = math.floor(pos.y) - 1, z = math.floor(pos.z)}
+				local n = minetest.get_node(pos)
+				if n.name == "air" then
+				else
+					--create turret node
+					local p = self.object:get_pos()
+					p = {x = math.floor(p.x), y = math.floor(p.y), z = math.floor(p.z)}
+					--check if the node with pos p is air
+					local n = minetest.get_node(p)
+					if n.name == "air" then
+						local rotation_param2 = self.object:get_rotation().x
+						minetest.set_node(p, {name = "portalgun:turretgun2", param2 = rotation_param2})
+						minetest.get_node_timer(p):start(0.2)
+						self.object:remove()
+					end
+				end
+			end
+		end,
+		on_detach = function(self, player)
+			--set held variable to false
+			self.held = false
+		end,
+		_held = true,
+	}
+)
+
 minetest.register_node(
     "portalgun:turretgun",
     {