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.cursor/rules/roblox/physics/constraints/prismatic.md
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---
title: Prismatic
description: PrismaticConstraint allows two attachments to slide along one axis but not rotate, with optional assigned power for mechanisms like sliding doors and elevator platforms.
---
<Alert severity="info">
For an overview on creating, visualizing, and simulating mechanical constraints, including `Class.PrismaticConstraint`, see [Mechanical constraints](../../physics/mechanical-constraints.md). Also see [Roblox&nbsp;units](../../physics/units.md) to understand how Roblox units compare to metric units.
</Alert>
A `Class.PrismaticConstraint` creates a rigid joint between two attachments, allowing them to slide along one axis but not rotate. The constraint can also be [powered](#linear-power) for mechanisms like sliding doors and elevator platforms.
<video controls src="../../assets/physics/constraints/Prismatic-Demo.mp4" width="90%" alt="Demo video of PrismaticConstraint"></video>
<Alert severity="info">
Orientation of a prismatic's attachments affects how it will move. To ensure movement occurs along the desired axis, each attachment's `Class.Attachment.Axis|Axis`, visualized by the yellow arrow, should point in the same direction.
</Alert>
## Linear power
If a prismatic's `Class.PrismaticConstraint|ActuatorType` is set to `Enum.ActuatorType|Motor`, it attempts to translate the attachments with the goal of reaching `Class.PrismaticConstraint|Velocity`. You can further control this translation through both `Class.PrismaticConstraint|MotorMaxAcceleration` and `Class.PrismaticConstraint|MotorMaxForce`.
If a prismatic's `Class.PrismaticConstraint|ActuatorType` is set to `Enum.ActuatorType|Servo`, it attempts to translate the attachments to a set separation specified by `Class.PrismaticConstraint|TargetPosition`. This translation is controlled by `Class.PrismaticConstraint|Speed`, `Class.PrismaticConstraint|LinearResponsiveness`, and `Class.PrismaticConstraint|ServoMaxForce`.
<GridContainer numColumns="2">
<figure>
<video controls src="../../assets/physics/constraints/Prismatic-ActuatorType-Motor.mp4" alt="Video showing linear power configured for motor behavior"></video>
<figcaption>ActuatorType = **Motor**</figcaption>
</figure>
<figure>
<video controls src="../../assets/physics/constraints/Prismatic-ActuatorType-Servo.mp4" alt="Video showing linear power configured for servo behavior"></video>
<figcaption>ActuatorType = **Servo**</figcaption>
</figure>
</GridContainer>
## Limits
You can set limits to restrict the sliding range a prismatic. Enabling the `Class.PrismaticConstraint|LimitsEnabled` property exposes the `Class.PrismaticConstraint|LowerLimit` and `Class.PrismaticConstraint|UpperLimit` values, as well as `Class.PrismaticConstraint|Restitution` which defines the elasticity of the attachments when they reach either limit.