Learn
Engine Class
Explosion

Code Samples
Explosion Instantiation
local explosion = Instance.new("Explosion")
explosion.BlastRadius = 60
explosion.ExplosionType = Enum.ExplosionType.Craters -- damages terrain
explosion.Position = Vector3.new(0, 10, 0)
explosion.Parent = workspace

API Reference
Properties
BlastPressure
Read Parallel
Capabilities: AvatarBehavior
Explosion.BlastPressure:number
Code Samples
Custom Explosion
local function customExplosion(position, radius, maxDamage)
local explosion = Instance.new("Explosion")
explosion.BlastPressure = 0 -- this could be set higher to still apply velocity to parts
explosion.DestroyJointRadiusPercent = 0 -- joints are safe
explosion.BlastRadius = radius
explosion.Position = position
-- set up a table to track the models hit
local modelsHit = {}
-- listen for contact
explosion.Hit:Connect(function(part, distance)
local parentModel = part.Parent
if parentModel then
-- check to see if this model has already been hit
if modelsHit[parentModel] then
return
end
-- log this model as hit
modelsHit[parentModel] = true
-- look for a humanoid
local humanoid = parentModel:FindFirstChild("Humanoid")
if humanoid then
local distanceFactor = distance / explosion.BlastRadius -- get the distance as a value between 0 and 1
distanceFactor = 1 - distanceFactor -- flip the amount, so that lower == closer == more damage
humanoid:TakeDamage(maxDamage * distanceFactor) -- TakeDamage to respect ForceFields
end
end
end)
explosion.Parent = game.Workspace
-- Roblox removes explosions after a few seconds, but does not destroy them.
-- To ensure our .Hit connection gets disconnected, destroy the explosion once it's removed.
explosion.AncestryChanged:Connect(function()
if not explosion.Parent then
explosion:Destroy()
end
end)
end
customExplosion(Vector3.new(0, 10, 0), 12, 50)

BlastRadius
Read Parallel
Capabilities: AvatarBehavior
Explosion.BlastRadius:number
Code Samples
Explosion Instantiation
local explosion = Instance.new("Explosion")
explosion.BlastRadius = 60
explosion.ExplosionType = Enum.ExplosionType.Craters -- damages terrain
explosion.Position = Vector3.new(0, 10, 0)
explosion.Parent = workspace

DestroyJointRadiusPercent
Read Parallel
Capabilities: AvatarBehavior
Explosion.DestroyJointRadiusPercent:number
Code Samples
Non lethal explosions
local function onDescendantAdded(instance)
if instance:IsA("Explosion") then
local explosion = instance
explosion.DestroyJointRadiusPercent = 0
local destroyJointRadiusPercent = 1
explosion.Hit:Connect(function(part, distance)
-- check the part is in range to break joints
if distance <= destroyJointRadiusPercent * explosion.BlastRadius then
-- make sure the part does not belong to a character
if not game.Players:GetPlayerFromCharacter(part.Parent) then
part:BreakJoints()
end
end
end)
end
end
workspace.DescendantAdded:Connect(onDescendantAdded)
Custom Explosion
local function customExplosion(position, radius, maxDamage)
local explosion = Instance.new("Explosion")
explosion.BlastPressure = 0 -- this could be set higher to still apply velocity to parts
explosion.DestroyJointRadiusPercent = 0 -- joints are safe
explosion.BlastRadius = radius
explosion.Position = position
-- set up a table to track the models hit
local modelsHit = {}
-- listen for contact
explosion.Hit:Connect(function(part, distance)
local parentModel = part.Parent
if parentModel then
-- check to see if this model has already been hit
if modelsHit[parentModel] then
return
end
-- log this model as hit
modelsHit[parentModel] = true
-- look for a humanoid
local humanoid = parentModel:FindFirstChild("Humanoid")
if humanoid then
local distanceFactor = distance / explosion.BlastRadius -- get the distance as a value between 0 and 1
distanceFactor = 1 - distanceFactor -- flip the amount, so that lower == closer == more damage
humanoid:TakeDamage(maxDamage * distanceFactor) -- TakeDamage to respect ForceFields
end
end
end)
explosion.Parent = game.Workspace
-- Roblox removes explosions after a few seconds, but does not destroy them.
-- To ensure our .Hit connection gets disconnected, destroy the explosion once it's removed.
explosion.AncestryChanged:Connect(function()
if not explosion.Parent then
explosion:Destroy()
end
end)
end
customExplosion(Vector3.new(0, 10, 0), 12, 50)

ExplosionType
Read Parallel
Capabilities: AvatarBehavior
Explosion.ExplosionType:Enum.ExplosionType
Code Samples
Stop Explosions from Damaging Terrain
local function onDescendantAdded(instance)
if instance:IsA("Explosion") then
instance.ExplosionType = Enum.ExplosionType.NoCraters
instance:GetPropertyChangedSignal("ExplosionType"):Connect(function()
instance.ExplosionType = Enum.ExplosionType.NoCraters
end)
end
end
workspace.DescendantAdded:Connect(onDescendantAdded)

LocalTransparencyModifier
Hidden
Not Replicated
Read Parallel
Capabilities: AvatarBehavior
Explosion.LocalTransparencyModifier:number

Position
Read Parallel
Capabilities: AvatarBehavior
Explosion.Position:Vector3
Code Samples
Explosion Instantiation
local explosion = Instance.new("Explosion")
explosion.BlastRadius = 60
explosion.ExplosionType = Enum.ExplosionType.Craters -- damages terrain
explosion.Position = Vector3.new(0, 10, 0)
explosion.Parent = workspace

TimeScale
Read Parallel
Capabilities: AvatarBehavior
Explosion.TimeScale:number

Visible
Read Parallel
Capabilities: AvatarBehavior
Explosion.Visible:boolean
Code Samples
Explosion Custom Visuals
local function customExplosion(position)
local explosion = Instance.new("Explosion")
explosion.Position = position
explosion.Visible = false
local attachment = Instance.new("Attachment")
attachment.Position = position
attachment.Parent = workspace.Terrain
local particleEmitter = Instance.new("ParticleEmitter")
particleEmitter.Enabled = false
particleEmitter.Parent = attachment
particleEmitter.Speed = NumberRange.new(5, 30)
particleEmitter.SpreadAngle = Vector2.new(-90, 90)
explosion.Parent = workspace
particleEmitter:Emit(20)
task.delay(5, function()
if attachment then
attachment:Destroy()
end
end)
end
customExplosion(Vector3.new(0, 10, 0))

Events
Hit
Capabilities: AvatarBehavior
Explosion.Hit(
part:BasePart, distance:number
Parameters
distance:number
Code Samples
Custom Explosion
local function customExplosion(position, radius, maxDamage)
local explosion = Instance.new("Explosion")
explosion.BlastPressure = 0 -- this could be set higher to still apply velocity to parts
explosion.DestroyJointRadiusPercent = 0 -- joints are safe
explosion.BlastRadius = radius
explosion.Position = position
-- set up a table to track the models hit
local modelsHit = {}
-- listen for contact
explosion.Hit:Connect(function(part, distance)
local parentModel = part.Parent
if parentModel then
-- check to see if this model has already been hit
if modelsHit[parentModel] then
return
end
-- log this model as hit
modelsHit[parentModel] = true
-- look for a humanoid
local humanoid = parentModel:FindFirstChild("Humanoid")
if humanoid then
local distanceFactor = distance / explosion.BlastRadius -- get the distance as a value between 0 and 1
distanceFactor = 1 - distanceFactor -- flip the amount, so that lower == closer == more damage
humanoid:TakeDamage(maxDamage * distanceFactor) -- TakeDamage to respect ForceFields
end
end
end)
explosion.Parent = game.Workspace
-- Roblox removes explosions after a few seconds, but does not destroy them.
-- To ensure our .Hit connection gets disconnected, destroy the explosion once it's removed.
explosion.AncestryChanged:Connect(function()
if not explosion.Parent then
explosion:Destroy()
end
end)
end
customExplosion(Vector3.new(0, 10, 0), 12, 50)

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