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rojo/.cursor/rules/roblox/en-us/physics/constraints/prismatic.md
Joe d5522b2fef update rules
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title description
Prismatic PrismaticConstraint allows two attachments to slide along one axis but not rotate, with optional assigned power for mechanisms like sliding doors and elevator platforms.
For an overview on creating, visualizing, and simulating mechanical constraints, including `Class.PrismaticConstraint`, see [Mechanical constraints](../../physics/mechanical-constraints.md). Also see [Roblox units](../../physics/units.md) to understand how Roblox units compare to metric units.

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 for mechanisms like sliding doors and elevator platforms.

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.

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.

ActuatorType = **Motor**
ActuatorType = **Servo**

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.