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The LeftParamA property is relevant when a part’s /BasePart/LeftSurface is set to Motor or SteppingMotor and /BasePart/LeftSurfaceInput is set to Sin. It determines the amplitude of the motor’s rotational velocity, using the following formula:

MotorVelocity = ParamA * math.sin(workspace.DistributedGameTime * ParamB)

In no other cases is this property used.

Code Samples

Motor Control

This code sample demonstrates how surface properties can be set using only a NormalId (Top, Front, etc). It switches a motor’s -SurfaceInput from NoInput, Constant and Sin to show how each work using -ParamA and -ParamB properties.