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---
title: Beams
description: Beams create a visual, animatable effect between two attachments.
---
A `Class.Beam` is an object that renders a `Class.Texture` between two `Class.Attachment` objects. By setting beam properties, you can:
- Add a [texture](#texture) and [color gradient](#color) to create interesting visuals like waterfalls and force fields.
- Modify a beam's [transparency](#transparency) so that it fades over time.
- Warp its shape by changing the [width](#width) or [curve](#curve) of each attachment point.
- Specify the texture's [length and mode](#texture-lengthmode) to affect how it repeats across the beam's length.
<video src="../assets/lighting-and-effects/beam/Showcase.mp4" controls
width="100%"></video>
## Create beams
Before you begin to create a beam, it's useful to toggle on visibility of attachments so you can see where the beam starts and ends. You can do so by enabling **Show Constraint Details** from Studio's **View** menu.
To create a beam:
1. Create two parts and position them a short distance from each other. One will act as the start of the beam and the other as the end of the beam. Group the parts into a `Class.Model`.
2. In the **Explorer** window, add an `Class.Attachment` object to each part:
1. Hover over one part and click the &CirclePlus; button. A contextual menu displays.
2. From the contextual menu, insert an **Attachment**.
3. Repeat for the other part.
3. In the **Explorer** window, add a `Class.Beam` object to the model:
1. Hover over the model and click the &CirclePlus; button. A contextual menu displays.
2. From the contextual menu, insert a **Beam**.
<img src="../assets/studio/explorer/Model-Beam-Setup.png" width="320" />
4. Select the new **Beam** object and assign its attachments. Ensure you assign each attachment property to a different `Class.Attachment` object.
1. In the **Properties** window, select the **Attachment0** property. Your cursor changes.
2. In the **Explorer** window, select the attachment of the part you want to be the start of your beam.
3. Back in the **Properties** window, select the **Attachment1** property. Your cursor changes.
4. In the **Explorer** window, select the attachment of the part you want to be the end of your beam.
<figure>
<img src="../assets/lighting-and-effects/beam/Default-Beam.png" width="800" />
<figcaption>Default beam between two attachments</figcaption>
</figure>
<Alert severity="warning">
Beams require attachments to function properly. If you remove either attachment object from step 4, the beam stops rendering its texture.
</Alert>
## Customize beams
By experimenting with the following properties, you can customize a beam's visual appearance to make unique gameplay elements like force fields, waterfalls, and pathway obstacles.
<video controls loop muted>
<source src="../assets/tutorials/laser-traps-with-beams/laserTrap_beamExamples.mp4" width="80%" />
</video>
<Alert severity="info">
The visual quality of your beams can change depending on the graphics settings on the player's device. To review your beam across quality levels, it's recommended to open [Studio Settings](../studio/setup.md#customization), search for **Editor Quality Level**, and set it to the both the lowest and highest level after you finish customizing your beam.
</Alert>
### Texture
The `Class.Beam.Texture|Texture` property renders that texture across the length of the beam. You can set a beam's `Class.Beam.Texture|Texture` property to any asset ID. For more information, including how to add or upload your own textures, see [here](../projects/assets/manager.md#asset-import).
<img src="../assets/lighting-and-effects/beam/Texture-Applied.png" alt="A texture of dark gray circles against a grey background emits between two attachments." width="800" />
A beam renders its texture using two triangles drawn between `Class.Beam.Segments|Segments`, and the segments are laid out between the two attachment points' orientation. When you rotate attachment points in different directions, segments also rotate.
<img src="../assets/lighting-and-effects/beam/Attachments-Rotated.png" alt="The same texture from the previous image is now curved because the attachments are in different orientations." width="800" />
### Color
The `Class.Beam.Color|Color` property tints the beam's texture to either a specific hue, or to a gradient `Datatype.ColorSequence` across its entire span.
<Tabs>
<TabItem label="Constant Color">
1. In the **Explorer** window, select the beam.
2. In the **Properties** window, select the **Color** property. You can either:
1. Click on the color square to open the **Colors** pop-up window and select a color.
2. Input three numbers into the RGB color value field.
<img src="../assets/studio/properties/Color-Input-Options.png" alt="" width="320" />
</TabItem>
<TabItem label="Color Gradient">
1. In the **Explorer** window, select the beam.
1. In the **Properties** window, click inside the **Color** property field, then click the **&ctdot;** button.
<img src="../assets/studio/properties/Color-Open-Sequence.png" width="320" alt="Button to open color sequence popup" />
In the color sequence popup, each triangle on the bottom axis is a
**keypoint** that determines the color value of the beam at that
point along its span.
<img src="../assets/studio/general/ColorSequence-White-Keypoints-Labeled.png" width="640" alt="Keypoints labeled in color sequence popup" />
1. Click the keypoint at the start of the color sequence, click the
small square next to **Color**, and select a color from the popup window.
<img src="../assets/studio/general/ColorSequence-Red-White.png" width="640" alt="Color sequence popup from red to white" />
1. If you want the beam to change color near the end of its span, click the keypoint at the end of the color sequence, click the small square next to **Color**, and select a color from the popup window.
<img src="../assets/studio/general/ColorSequence-Red-Purple.png" width="640" alt="Color sequence popup from red to purple" />
1. For more customization, you can:
- Add another keypoint by clicking anywhere on the graph.
- Make a color change sooner or later within the gradient by dragging an intermediary keypoint to a new position.
- Delete an intermediary keypoint by selecting it and clicking the **Delete** button.
- Reset the entire sequence by clicking the **Reset** button.
<img src="../assets/studio/general/ColorSequence-Red-Cyan-Purple.png" width="640" alt="Color sequence popup from red to cyan to purple" />
<img src="../assets/lighting-and-effects/beam/ColorSequence-Applied.png" width="800" />
</TabItem>
</Tabs>
### Transparency
The `Class.Beam.Transparency|Transparency` property sets the transparency of the beam as a consistent value or as a `Datatype.NumberSequence` with ranges from **0** (totally opaque) to **1** (fully clear).
<Tabs>
<TabItem label="Constant Opacity">
1. In the **Explorer** window, select the beam.
1. In the **Properties** window, select the **Transparency** property.
1. Input the desired opacity for the beam.
</TabItem>
<TabItem label="Number Sequence">
1. In the **Explorer** window, select the beam.
1. In the **Properties** window, click inside the **Transparency** property field, then click the **&ctdot;** button.
<img src="../assets/studio/properties/Transparency-Open-Sequence.png" width="320" alt="Button to open number sequence popup" />
In the number sequence popup, each square at the start and end of the graph is a **keypoint** that determines the opacity value of the beam at that
point along its span. By default, the graph defaults to a straight line and the beam is of consistent opacity.
<img src="../assets/studio/general/NumberSequence-0.5-0.5-Keypoints-Labeled.png" width="746" alt="Keypoints labeled in number sequence popup" />
1. Perform any of the following actions:
- To change the opacity at a point, click on a keypoint and either
drag it up or down, or enter a value in the **Value** field.
- To insert a new keypoint, click on any point in the graph.
- To delete a keypoint, select it and click the **Delete** button.
- Reset the entire sequence by clicking the **Reset** button.
<img src="../assets/studio/general/NumberSequence-0-1-0.png" width="746" alt="Number sequence popup from 0 to 1 to 0" />
<img src="../assets/lighting-and-effects/beam/Transparency-Applied.png" width="800" />
</TabItem>
</Tabs>
### Width
You can set the beam's width in studs at each endpoint by configuring the
`Class.Beam.Width0|Width0` and `Class.Beam.Width1|Width1` properties. A higher value equates to a larger width and a lower value equates to a smaller width. If you set either value to smaller than 0, Studio sets it back to **0**.
The beam below has a `Class.Beam.Width0|Width0` value of **0.5** and a
`Class.Beam.Width1|Width1` value of **3**.
<img src="../assets/lighting-and-effects/beam/Width-Adjusted.png" alt="A texture emits between two attachments. The texture starts with a small width and ends with a large width." width="800" />
### Texture length/mode
A beam's `Class.Beam.TextureLength|TextureLength` and `Class.Beam.TextureMode|TextureMode` determine how its [texture](#texture) repeats across its length.
When `Class.Beam.TextureMode|TextureMode` is set to `Enum.TextureMode.Wrap` or `Enum.TextureMode.Static`, the texture repetitions will equal the beam's overall length (in&nbsp;studs) divided by its `Class.Beam.TextureLength|TextureLength`.
<img src="../assets/engine-api/enums/TextureMode/Wrap-Static.png" width="720" alt="TextureMode diagram with Wrap or Static mode" />
<figure>
When `Class.Beam.TextureMode|TextureMode` is set to `Enum.TextureMode.Stretch`, the texture will repeat `Class.Beam.TextureLength|TextureLength` times across the beam's overall length.
<img src="../assets/engine-api/enums/TextureMode/Stretch.png" width="720" alt="TextureMode diagram with Stretch mode" />
</figure>
### Facing
A beam is a 2D projection existing in 3D space, meaning that it may not be visible from every angle. The `Class.Beam.FaceCamera|FaceCamera` property, when set to `true`, ensures that the beam always faces the `Class.Workspace.CurrentCamera|CurrentCamera`, regardless of its orientation.
<figure>
<video src="../assets/lighting-and-effects/beam/FaceCamera.mp4" controls width="800"></video>
<figcaption>Default vs. FaceCamera</figcaption>
</figure>
### Curve
Beams are configured to use a cubic Bézier curve formed by four control points. This means they are not constrained to straight lines and the curve of the beam can be modified by changing `Class.Beam.CurveSize0|CurveSize0`, `Class.Beam.CurveSize1|CurveSize1`, and the orientation of the beam's `Class.Attachment|Attachments`.
- **P0** — The start of the beam; position of `Class.Beam.Attachment0|Attachment0`.
- **P1** — `Class.Beam.CurveSize0|CurveSize0` studs away from `Class.Beam.Attachment0|Attachment0`, in the positive **X** direction of `Class.Beam.Attachment0|Attachment0`.
- **P2** — `Class.Beam.CurveSize1|CurveSize1` studs away from `Class.Beam.Attachment1|Attachment1`, in the negative **X** direction of `Class.Beam.Attachment1|Attachment1`.
- **P3** — The end of the beam; position of `Class.Beam.Attachment1|Attachment1`.
<img src="../assets/engine-api/classes/Beam/Curvature-Diagram.png" width="800" alt="Beam curvature diagram" />
<img src="../assets/lighting-and-effects/beam/Curves-Applied.png" alt="" width="800" />