In Deadly Lava, you learned how to trigger code based on player behavior. This course will show you how to make a platform which fades away when a player steps on it.

Setting Up

If you followed the Deadly Lava course, you can place your fading platform above the lava floor — either way, it should go over a space that players can’t jump across.

1. Insert a part and move it into place in your game world - call it FadingPlatform.

2. Resize it so a player can jump on it.

3. Make sure it’s anchored.

   

4. Insert a Script into the part, rename it to FadeOnTouch, and remove the default code.

   

5. Create a variable for the platform and an empty function connected to the platform’s Touched event.

   local platform = script.Parent
   
   local function fade()
   
   end
   
   platform.Touched:Connect(fade)

Fading the Platform

Having the platform vanish in an instant would be no fun at all - players would find it impossible to get across the gap. It would be better if the platform could fade away before players could fall through it to give them a chance to jump off.

You could change the Transparency property and wait a very short time over and over again to get this effect, but a gradual fade would require at least 10 changes between 0 and 1. That’s 20 lines of very repetitive code.

This can be achieved much more effectively using a for loop which repeats code a specific number of times. Each loop of the code is known as an iteration. A for loop is defined with three things, separated by commas:

• Control variable - The variable created and used to count the loops. In this example, it’s count and the starting value is 1.
• End value - The value it has to get to for the loop to stop. In this example, it’s 10.
• Step increment (optional) - Determines what to add to the control variable each loop. If left out, it defaults to 1, so in this example it’s unnecessary.

1. In the function, create a for loop starting from 1 which iterates 10 times.

2. Inside the for loop, set the Transparency property to the control variable divided by 10.

3. Call the wait function with a time of 0.1.

   local platform = script.Parent
   
   local function fade()
   	for count = 1, 10 do
   		platform.Transparency = count / 10
   		wait(0.1)
   	end
   end
   
   platform.Touched:Connect(fade)

When the loop runs, count increases by 1 with each iteration. This means that the platform’s Transparency will increase by 0.1 every 0.1 seconds, reaching full transparency after 1 second.

Reappearing

After the platform has vanished, players should fall through it. The platform should also come back a few seconds after it fades - otherwise, players would never get to try the jump again if they failed. The CanCollide property controls whether players can fall through a part.

1. Set the CanCollide property of the platform to false after the for loop.

2. Wait for a few seconds using the wait function.

3. Set the CanCollide property back to true.

4. Set the Transparency property back to 0.

   local platform = script.Parent
   
   local function fade()
   	for count = 1, 10 do
   		platform.Transparency = count / 10
   		wait(0.1)
   	end
       platform.CanCollide = false
   	wait(3)
   	platform.CanCollide = true
   	platform.Transparency = 0
   end
   
   platform.Touched:Connect(fade)