EBGeometry::ExpMinOp< T > Struct Template Reference

Exponential smooth minimum for blending two signed-distance values. More...

#include <EBGeometry_Blend.hpp>

Public Member Functions
T	operator() (const T &a, const T &b, const T &s) const noexcept
	Evaluate the exponential smooth minimum.

Detailed Description

template<class T>
struct EBGeometry::ExpMinOp< T >

Exponential smooth minimum for blending two signed-distance values.

Evaluates -s log(exp(-a/s) + exp(-b/s)), which approximates min(a, b) with exponential weighting; the blend region width scales with s. Useful when a differentiable interface is required. Approaches min(a, b) as s → 0. Computed as min(a, b) - s log1p(exp(-|a - b| / s)), which equals the formula above but cannot overflow or underflow however far a and b are from zero. A trivially copyable function object, so it can be stored in a BVHSmoothUnion and evaluated on a device.

Template Parameters

T	Floating-point precision.

Member Function Documentation

operator()()

template<class T >

T EBGeometry::ExpMinOp< T >::operator() ( const T &  a, const T &  b, const T &  s  ) const

inlinenoexcept

Evaluate the exponential smooth minimum.

Parameters

[in]	a	First value.
[in]	b	Second value.
[in]	s	Smoothing length (must be > 0).

Returns

Exponentially blended approximation of min(a, b).

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The documentation for this struct was generated from the following file:

• Source/EBGeometry_Blend.hpp