# How do I rotate an object back and forth?

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I want my object to rotate between two angles in relation to speed and it doesn't need to be a smooth rotation, how can I achieve that?

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Posted (edited)
Like a speedometer needle?

When the speed changes, do the following:

float normalizedSpeed = actualSpeed / kMaximumSpeedForSpeedometer;

if (normalizedSpeed < 0.0f) // You can also use Mathf.clamp if you want.
normalizedSpeed = 0.0f;
else if (normalizedSpeed > 1.0f)
normalizedSpeed = 1.0f;

float angleForSpeedometer = normalizedSpeed * (maximumAngle - minimumAngle) + minimumAngle;

// set the speedometer needle's transform rotation using this angle.
// see: https://docs.unity3d.com/ScriptReference/Transform-rotation.html
// or: https://docs.unity3d.com/ScriptReference/Transform-eulerAngles.html

maximumAngle is a rotation angle that you specify for the top-speed of the needle. minimumAngle is the same thing but for the zero-speed angle. Edited by Nypyren

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