Collecting Items | Tài liệu - Trung Tâm Nhà Sáng Tạo Roblox

With the leaderboard created, players need something to collect. For that, you need to create a 3D item for players to find in the world. Below is a video of the process of players harvesting items.

Build an Item

Items in the experience are 3D models that players use a tool to harvest. Each item, once harvested, disappears and then reappears after a limited amount of time.

For the item, refer back to your game design document. This series uses crystals as the example.

Create an object, either using parts or objects found by trusted users in the Marketplace.

If desired, download the crystal part with this link. To add it, right-click on the Workspace and select Insert from File.
If using your own part, group all the parts into a Model. One way of doing this is to select all items, right-click on a part, and select Group. This creates a model that organizes your parts.
Make sure that the parts are all anchored.
So items cannot be harvested while they disappear, create a BoolValue named CanHarvest to track its status.
In Properties for CanHarvest, check the Value box. Checking the value box makes the boolean true, meaning players can harvest the item.

Players need something like an ax or a shovel to gather items with. In Roblox, items that players can equip and use are called tools. This lesson uses a starter tool with all the parts and an animation already made that you can customize later.

Adding the Tool

For players to use the starter tool, download and place it in the StarterPack.

Download the starter tool below.
In Explorer, under Workspace, right-click on StarterPack. Then, select Insert from File.
Select the downloaded file, starterTool.rbxm.
Playtest your project. Players should be equipped with the tool as soon as they start. In-game, press 1 to equip or put away the tool. Left-click to swing it.

If you want to rename the starter tool, just rename the object in StarterPack. That name displays to players.

Coding the Tool

If the tool hits a harvestable object and the player has enough space in their bag, the player's item count goes up by 1 on the leaderboard. Harvesting an item makes it disappear for a few seconds and become unharvestable for a few seconds before reappearing. This encourages players to explore to find more items, instead of just clicking the same item.

Setting up the Script

At this point, add a script to the tool. This script handles what happens when the tool touches a harvestable object.

In StarterPack, under StarterTool, add a new script named ToolScript.

In the script, write a descriptive comment at top, and then create variables to store the tool part and the tool itself.


-- Gives players item when they touch a harvestable part
local tool = script.Parent
local toolPart = tool.Handle

Checking for Items

Whenever the tool touches an object, it checks if that object has CanHarvest inside and if the boolean is set to True.

Create a new function named onTouch() with a parameter named partTouched.


local tool = script.Parent
local toolPart = tool.Handle

local function onTouch(partTouched)

end

In that function, create a local variable named canHarvest. Then, use the FindFirstChild() function to see if there is CanHarvest boolean in the parent of that part.


local function onTouch(partTouched)
  local canHarvest = partTouched:FindFirstChild("CanHarvest")
end

Now the script needs to check if there was actually anything found and if so, run the code. To do this, create an if statement where the condition is canHarvest. If anything exists in canHarvest, this statement evaluates to true.


local function onTouch(partTouched)
  local canHarvest = partTouched:FindFirstChild("CanHarvest")
  if canHarvest then

  end
end

In the if statement, add a print statement to see if the script is working. You can code the logic for harvesting items after you're sure it works.


if canHarvest then
    -- Used for testing if code works
  print("Found an item")
end

Under the function's end statement, add toolPart.Touched:Connect(onTouch). This lets the script check if anything is touching the tool (or in this case, its handle) and if so, calls onTouch().


local function onTouch(partTouched)
  local canHarvest = partTouched:FindFirstChild("CanHarvest")
  if canHarvest then
    print("Found an item")
  end
end

toolPart.Touched:Connect(onTouch)

Play the project and use the tool on a harvestable item (left-click to swing). Make sure you see the message "Found an item" in the Output Window.

Troubleshooting Tips

If you don't see the message, try the following tips.

If you're using custom parts and meshes, it's possible to get an error. The script only works if the CanHarvest object is a child of the part the tool is touching.
Make sure that the tool is in the StarterPack, not in the Workspace.
Check that the part is anchored.

Getting Player Stats

Before increasing the player's items, the tool must find the location of how many items a player has in that player's leaderboard. Once the tool has access to the leaderboard, it can change that player's item count.

First, get the player using the tool. In the ToolScript, under local item = toolitem, and above the custom function, type:


local item = toolitem

local backpack = tool.Parent
local player = backpack.Parent

local function onTouch(partTouched)

On the next line, find the player's leaderstats using the FindFirstChild() function.


local backpack = tool.Parent
local player = backpack.Parent
local playerStats = player:FindFirstChild("leaderstats")

local function onTouch(partTouched)

Under local playerStats, create variables to store the items and spaces stats.


local playerStats = player:FindFirstChild("leaderstats")
local playerItems = playerStats:FindFirstChild("Items")
local playerSpaces = playerStats:FindFirstChild("Spaces")

The strings inside the () for FindFirstChild() need to be the same as the IntValue names in the PlayerSetup script. If you had a different name for the items, make sure it's the same as in the PlayerSetup script.

Checking for a Harvestable Object

Now that the tool script has the playerItems and playerSpaces variables created, you can start giving players an item. Use the function created to check if the object touching the tool can be harvested, and if the player has enough space in their bag to increase the items shown on the leaderboard by one.

The script will need an if statement with two conditions to be met. Start by creating an if statement, then add in the following conditions, connected with the and keyword. .

canHarvest.Value == true
playerItems.Value < playerSpaces.Value


local function onTouch(partTouched)
  local canHarvest = partTouched.Parent:FindFirstChild("CanHarvest")
  if canHarvest then
    if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then

    end
  end
end

To access the contents of any value object, type .Value at the end of it. If you just do the object itself, you'll just get it's name.

In the if statement itself, add to the player's items by typing playerItems.Value += 1.


if canHarvest then
  if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then
      playerItems.Value += 1

  end
end

Play your project; use your tool to harvest an item and check that the item count went up.

Right now, the player's Items stat will instantly fill up after hitting one item. In the next section, you'll make the item reset so players only get one item from each item.

Resetting the Item

When the item is harvested, it will reset in two ways:

The item will disappear and not be interactable
CanHarvest set to false

The item will then go back to normal after a short time. This way, players only get one item for each harvest, and need to look around for more while the original resets.

Under where items are added, set canHarvest to false. By making the value of canHarvest false as soon as players harvest the item, the script won't give more than one item per tool hit.


if canHarvest then
  if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then
    playerItems.Value += 1
    canHarvest.Value = false
  end
end

After setting the value to false, set the part's Transparency to 1 (invisible), and CanCollide to false, meaning players can't touch it.


if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then
  playerItems.Value += 1
  canHarvest.Value = false
  partTouched.Transparency = 1
  partTouched.CanCollide = false
end

Type task.wait(5) to give time for the item to reset. 5 is a suggested number, and maybe differ for how long you'd like for your experience.


if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then
  playerItems.Value += 1
  canHarvest.Value = false
  partTouched.Transparency = 1
  partTouched.CanCollide = false
  task.wait(5)
end

After the wait, do the opposite of previous code, by setting the CanHarvest to true, and resetting the Transparency and CanCollide to their original values.


task.wait(5)
  canHarvest.Value = true
  partTouched.Transparency = 0
  partTouched.CanCollide = true
end

Play the project and check:
- The player only gets 1 item for harvesting an item.
- The item disappears and then reappears after five seconds.

Troubleshooting Tips

At this point, if one of the checks didn't pass try one of the following below.

Check that Transparency and CanCollide are spelled and capitalized exactly.
Make sure to use canHarvest.Value and not canHarvest = true.

Complete ToolScript

A finished version of the script can be referenced below.


local toolPart = script.Parent
local tool = toolPart.Parent

local backpack = tool.Parent
local player = backpack.Parent
local playerStats = player:FindFirstChild("leaderstats")
local playerItems = playerStats:FindFirstChild("Items")
local playerSpaces = playerStats:FindFirstChild("Spaces")

local function onTouch(partTouched)
	local canHarvest = partTouched:FindFirstChild("CanHarvest")
	if canHarvest then
		if canHarvest.Value == true and playerItems.Value < playerSpaces.Value then
			playerItems.Value += 1
			canHarvest.Value = false
			-- Reset partTouched, the harvested item
			partTouched.Transparency = 1
			partTouched.CanCollide = false

			task.wait(5)
			-- Make the harvested item reappear and usable again
			canHarvest.Value = true
			partTouched.Transparency = 0
			partTouched.CanCollide = true
		end
	end
end

toolPart.Touched:Connect(onTouch)