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// Copyright 2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
// utility library containing sampling functions
// convention is to return the sample (vec3f) generated from given vec2f
// 's'ample as last parameter sampling functions often come in pairs: sample and
// pdf (needed later for MIS) good reference is "Total Compendium" by Philip
// Dutre http://people.cs.kuleuven.be/~philip.dutre/GI/
#include "rkcommon/math/rkmath.h"
namespace ospray {
inline float uniformSampleConePDF(const float cosAngle)
{
return rcp(float(two_pi) * (1.0f - cosAngle));
}
inline float uniformSampleRingPDF(const float radius, const float innerRadius)
{
return rcp(float(pi) * ((radius * radius) - (innerRadius * innerRadius)));
}
} // namespace ospray
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