FMath::InvExpApprox

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References

template<class T>  
static constexpr T InvExpApprox  
&40;  
    T X  
&41;  
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template<class T> static constexpr T InvExpApprox &40;     T X &41;

Remarks

Returns an approximation of Exp(-X) based on a Taylor expansion that has had the coefficients adjusted (using optimisation) to minimise the error in the range 0 < X < 1, which is below 0.1%. Note that it returns exactly 1 when X is 0, and the return value is greater than the real value for values of X > 1 (but it still tends to zero for large X).