Class SampleStatistics

openpgl/data/SampleStatistics.h:10–242

namespace openpgl
{
struct SampleStatistics
{
    Point3 mean{0.0f};
    Vector3 variance{0.0f};
    float numSamples{0};
    float numZeroValueSamples{0.0f};

    BBox sampleBounds{openpgl::Vector3(std::numeric_limits<float>::max()), openpgl::Vector3(-std::numeric_limits<float>::max())};

    inline void clear()
    {
        mean = Point3(0.0f);
        variance = Vector3(0.0f);
        numSamples = 0.0f;
        numZeroValueSamples = 0.0f;
        sampleBounds.lower = openpgl::Vector3(std::numeric_limits<float>::max());
        sampleBounds.upper = openpgl::Vector3(-std::numeric_limits<float>::max());
    }

    inline void addSample(const Point3 sample)
    {
        numSamples++;
        float incWeight = 1.f / float(numSamples);
        OPENPGL_ASSERT(numSamples > 0.0f);
        OPENPGL_ASSERT(embree::isvalid(incWeight));
        OPENPGL_ASSERT(incWeight >= 0.0f);

        const Point3 oldMean = mean;
        mean += (sample - oldMean) * incWeight;
        variance += (((sample - oldMean) * (sample - mean)) - variance) * incWeight;
        sampleBounds.extend(sample);
        OPENPGL_ASSERT(isValid());
    }

    inline Point3 getMean() const
    {
        return mean;
    }

    inline Vector3 getVariance() const
    {
        return variance;
    }

    inline BBox getSampleBounds() const
    {
        return sampleBounds;
    }

    inline Vector3 getSampleBoundsExtend() const
    {
        return sampleBounds.upper - sampleBounds.lower;
    }

    inline bool hasValidBoundRange() const
    {
        bool validBoundRange = false;
        Vector3 boundExtend = sampleBounds.upper - sampleBounds.lower;