Unity - Scripting API: Mathf.Epsilon

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public static float Epsilon;

Description

The smallest positive non-zero value that a float can represent. Using Mathf.Epsilon as a delta for equality makes the comparison effectively identical to exact equality on normal-range numbers. For an approximately equal value, use Mathf.Approximately or a tolerance that reflects your data’s scale, typically a combination of absolute and relative tolerances.

Operations with Epsilon follow these rules:

anyValue + Epsilon = anyValue
anyValue - Epsilon = anyValue
0 + Epsilon = Epsilon
0 - Epsilon = -Epsilon

A value between any number and Epsilon will result in an arbitrary number due to loss of trailing digits.

using UnityEngine;public class Example : MonoBehaviour
{
    // Avoid division by (near) zero using Mathf.Epsilon as a zero guard.
    float SafeDivide(float numerator, float denominator)
    {
        if (Mathf.Abs(denominator) <= Mathf.Epsilon)
            return 0f; // or handle appropriately
        return numerator / denominator;
    }
}