Explosion

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An Explosion applies force to BaseParts within the explosion's BlastRadius. This force breaks JointInstances and WeldConstraints between parts and kills Humanoid characters not protected by a ForceField. Constraints will not be broken by an explosion.

If an Explosion is parented anywhere in the data model while the experience is running, it immediately sets off and, within a few seconds, it becomes unparented. It is not destroyed with Instance:Destroy() in this case, so connections do not get disconnected and the parent is not locked. As with all instances, keeping a strong reference an Explosion will prevent it from being garbage collected.

Note that an Explosion must be a descendant of Workspace for the explosion visuals to play and the physical/damaging effects to have an impact.

Explosion Effects

Humanoids are killed by explosions, as the explosion breaks the character Model neck joint. Parenting a ForceField to a model will protect all of its children from the explosion kill effect.

If you do not want joints between BaseParts to be broken, or you want to implement your own formula for damaging Humanoids, it's recommended that you set DestroyJointRadiusPercent to 0 and use the Hit event to handle the result of the explosion.

Explosions can also be configured to damage Terrain, creating craters, as configured through the ExplosionType property.

Note that the effect of an explosion is not disrupted by obstacles, meaning that parts/terrain shielded behind other parts/terrain will still be affected.

範例程式碼

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

概要

屬性

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屬性

BlastPressure

number
平行讀取

Used to determine the amount of force applied to BaseParts caught in the Explosion.BlastRadius.

Currently this level of force applied does not vary based on distance from Explosion.Position. Unanchored BaseParts will accelerate equally away from the origin regardless of distance provided they are within the blast radius.

The blast pressure determines the acceleration of parts due to an explosion. It does not determine the degree to which joints are broken. When Explosion.DestroyJointRadiusPercent is equal to 1 all joints between parts in the Explosion.BlastRadius will be destroyed provided BlastPressure is greater than 0.

The BlastPressure also does not determine the amount of damage given to Terrain. Provided BlastPressure is greater than 0 and Explosion.ExplosionType isn't set to Enum.ExplosionType.NoCraters the size of the crater created is determined exclusively by the Explosion.BlastRadius.

Setting BlastPressure to 0 eliminates the effect of the explosion and is useful when developers want to program their own custom behavior for explosions using the Explosion.Hit event.

範例程式碼

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

number
平行讀取

This property determines the radius of the Explosion, in studs. This property accepts any value between 0 and 100.

This radius determines the area of effect of the Explosion, not the size of the Explosion's visuals. The size of the Explosion's visual effect is the same regardless of BlastRadius (even if BlastRadius is 0).

BaseParts within the BlastRadius will be affected by the explosion. Meaning, if Explosion.BlastPressure is greater than 0, force will be applied to parts. The degree to which joints are broken within the BlastRadius depends on Explosion.DestroyJointRadiusPercent. Explosion.Hit will fire for any every BasePart within the radius.

BaseParts are considered within Explosion.BlastRadius even if they are only partially in range.

範例程式碼

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

number
平行讀取

Used to set the proportion of the Explosion.BlastRadius, between 0 and 1, within which all joints will be destroyed. Anything outside of this range will only have the Explosion force applied to it.

For example, if Explosion.BlastRadius is set to 100 and DestroyJointRadiusPercent is set to 0.5, any joints within a radius of 50 studs would be broken. Any joints between the ranges of 50 and 100 studs wouldn't be destroyed, but the Explosion force would still be applied to the BaseParts.

This property allows developers to make Explosions 'non-lethal' to Humanoids by setting DestroyJointRadiusPercent to 0. This means the neck joint will not be broken when characters come into contact with the Explosion.

範例程式碼

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

Enum.ExplosionType
平行讀取

This property determines how the Explosion will interact with Terrain. It is an Enum.ExplosionType value and can be set to one of three options.

  • NoCraters - Explosions will not damage Terrain
  • Craters - Explosions will create craters in Terrain
  • CratersAndDebris - Redundant, behaves the same as Craters

If ExplosionType is set to create craters in Terrain, the radius of the crater will be roughly equal to the Explosion.BlastRadius. Craters are created in all Terrain materials other than water. The size of the crater is not influenced by the material, although some materials create rougher edges than others.

範例程式碼

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

number
隱藏
未複製
平行讀取

Position

Vector3
平行讀取

This property is the position of the center of the Explosion. It is defined in world-space and not influenced by the Explosion parent.

BaseParts will be influenced by the Explosion if they are within Explosion.BlastRadius studs of the explosion's position.

The effect of an explosion is instantaneous. This means that although the position of an explosion can be changed after it has been set it cannot affect two different areas. Once an explosion has been 'detonated', shortly after parenting it to a descendant of the Workspace, it will not do so again. In some cases the visual effect of the explosion will move but it will have no effect.

For this reason a new Explosion should be created if the developer wants an explosion to appear at a different position.

範例程式碼

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

number
平行讀取

A value between 0 and 1 that controls the speed of the particle effect. At 1 it runs at normal speed, at 0.5 it runs at half speed, and at 0 it freezes time.

Visible

bool
平行讀取

This property determines whether or not the visual effect of an Explosion is shown or not.

When Visible is set to false, the explosion will still affect BaseParts in its Explosion.BlastRadius, the only difference is it will not be seen.

One use for this property would be for a developer to make their own custom explosion effects using a ParticleEmitter, while retaining the default Explosion functionality.

範例程式碼

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))
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方法

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活動

Hit

Fires when the Explosion hits a BasePart within its Explosion.BlastRadius. Returns the part hit along with the distance of the part from Explosion.Position.

Note that the effect of an Explosion is not disrupted by obstacles, this means parts shielded behind other parts will still be hit, even if the BasePart they are shielded behind is anchored.

This event will also fire when Explosion.BlastPressure is equal to zero. This means developers can program their own custom behavior for explosions by eliminating the explosion's influence on BaseParts and Terrain.

Note that this event will fire for every BasePart hit. This means it can fire multiple times for the same player character (as the character Model is made up of multiple parts). For this reason when dealing custom damage using the Explosion.Hit event it's recommended to implement a check to see if the character has already been hit by the Explosion.

參數

part: BasePart

The BasePart hit by the Explosion.

distance: number

The distance of the hit from Explosion.Position.


範例程式碼

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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