# Making Lasers & Similar Attached Projectiles Sometimes a projectile doesn't move. Lasers, flamethrowers, and any other kind of projectile that is intended to stay in one spot, or attached to a `Transform`, can be created! This guide will walk through the setup for a laser projectile which stays attached to the **Spawn Point**. {% embed url="" %} We will be using the **Magic Arsenal by Archanor VFX** on the Asset Store for this. The "*Acane Beam*" is the beam itself, using a `LineRenderer`. The other two parts will be attached to the muzzle position and the "hit point" -- the place where the beam collides with another object.
## 1. Add a Projectile Compnent to the Beam
Use the "*Damage Over Time*" [**Projectile Data**](/magic-pig-games/projectile-factory/projectile-factory-documentation/projectile/projectile-data.md), and the "*Laser*" [**Spawn Behavior**](/magic-pig-games/projectile-factory/projectile-factory-documentation/spawn-behavior.md). The `DamageOverTime` class overrides how the damage is calculated, to multiply it by `Time.deltaTime`. ```csharp protected override float CalculateDamage() => damage * Time.deltaTime; ``` *Laser* **Spawn Behavior** is set up for a laser, including blocking multiple shots. Check the object for specifics. ## 2. Add a Raycast Shooter Component The [**`RaycastShooter`**](/magic-pig-games/projectile-factory/projectile-factory-documentation/additional-scripts/raycast-shooter-+-handlers.md) class is provided in **Projectile Factory,** and will fire a `raycast` forward, and pass hits to handlers on other objects in the prefab. Be sure to assign the *Raycast Origin* value.
## 3. Add a Line Renderer Length Component The **`LineRendererLength`** class handles the setting the length of the `LineRenderer` to the distance of any collision, or the max distance provided. This compoennt implements `IHandleRaycasts`, so the Raycast Shooter will pass the `Hit` value to this class.
## 4. Set up the Projectile ### **Add a Spawn Behavior Modification** Add a *Parent to Spawn Point* [**Spawn Behavior Modificatio**](/magic-pig-games/projectile-factory/projectile-factory-documentation/spawn-behavior/spawn-behavior-modification.md)[**n**](/magic-pig-games/projectile-factory/projectile-factory-documentation/spawn-behavior/spawn-behavior-modification.md).
There are no exposed parameters here -- this does one thing, and one thing only. After spawning, the **Projectile** will be parented to the **Spawn Point** `transform`. ### Add Behaviors
We will add two [**Behaviors**](/magic-pig-games/projectile-factory/projectile-factory-documentation/behaviors.md) to this **Projectile**. First, *Destroy on Spawner Stop* will destroy (or pool) the projectile when the spawner stops -- in the demo, this is when the "shoot" button is released. *Collision at Line Render End* will get the **Projectile** to check for a collision at the end of the `LineRenderer`, with the radius selected. ## 5. Set up the Muzzle & Impact Particles The *Muzzle* and *Impact* particles aren't part of the **Projectile** directly. Instead, they'll be child objects of the Projectile, and will be handled by other scripts.

Make these children of the Projectile

### Position the Objects The *Muzzle* object should be positioned at local 0, 0, 0 -- basically the same spot as the `LineRenderer` origin, which will be the Spawn Point. Add a `SetPositionFromRaycast` class to the *Impact* object. Be sure to assign the "Plumbing" values. This implements `IHandleRaycasts`, so the `RaycastShooter` will handle passing data to this script, which is how it knows where to set the position.
### Optional: Add Force You can also add an [**`AddForce`**](/magic-pig-games/projectile-factory/projectile-factory-documentation/additional-scripts/project-force.md) component to the Impact object. This will add physics force at that position, helping the game come alive.
## 6. Set the Layer of the Projectile Don't forget to change the layer of your projectile! And then save this as a `Prefab`. ## Done! That's it! Bring this onto a **Projectile Spawner** the same as any other **Projectile**, and it'll function exactly the same, but with its own unique logic and behavior. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://infinitypbr.gitbook.io/magic-pig-games/projectile-factory/overview-and-quickstart/quick-start-guide/making-lasers-and-similar-attached-projectiles.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.