Vanishing Bridge

Part of the Roblox Game Scripting section of Coddy's Lua journey. Lesson 10 of 24.

The blinking light changed one part. A bridge has many steps, and they all have to change together.

GetChildren() returns an object's direct children as a table, ready for a for loop. Functions that belong to an object, like GetChildren, are called with a colon:

for _, child in workspace.Bridge:GetChildren() do
	print(child.Name)
end

A folder can hold your Script too, and a Script has no Transparency. child:IsA("BasePart") is true for every kind of part and false for the Script. if condition then ... end runs the lines inside only when the condition is true:

if child:IsA("BasePart") then
	child.Transparency = 0.8
end

A part that is see-through can still be solid: CanCollide = false is what lets players fall through.

Challenge

Easy

The bridge has four steps over the void, and this script is in the bridge's folder. It makes the steps vanish once. Make the bridge cycle forever:

2 seconds after the start the steps vanish: Transparency 0.8, CanCollide false
2 seconds later they come back: Transparency 0, CanCollide true
this repeats every 4 seconds, forever

Press Play and time your run across, then Check.

Try it yourself

local bridge = script.Parent

-- This makes the steps vanish ONCE, after 2 seconds.
-- Make them come back 2 seconds later, and repeat forever.
task.wait(2)
for _, step in bridge:GetChildren() do
	if step:IsA("BasePart") then
		step.Transparency = 0.8
		step.CanCollide = false
	end
end

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Roblox Game Scripting

1Scripts and Parts

Hello, Roblox Paint a Part Stretch the Bridge Build a Platform

4Game Mechanics

Speed Pad Jump Pad Click Me The Button Door Moving Platform Checkpoints Finish Line

2Loops and Functions

Row of Pillars Staircase Builder Tower Builder Coin Factory Blinking LightVanishing Bridge

5Your First Game

Your First Obby

3Events and Players

Touch Pad Lava Floor Leaderstats Who Touched It?Coin Collector Coin Door

Practice on your own: Online Lua compiler