GaussianFilter(const ParamSet& paramSet)
{
float radius = paramSet.getFloat("radius", 2.0f);
m_size.x = m_size.y = radius;
float stddev = paramSet.getFloat("stddev", 0.5f);
m_alpha = 1.0f / (2.0f * stddev * stddev);
m_expX = exp(-m_alpha * m_size.x * m_size.x);
m_expY = exp(-m_alpha * m_size.y * m_size.y);
}
HeterogeneousMedium(const ParamSet& paramSet)
{
m_albedo = paramSet.getColor("albedo");
m_filename = paramSet.getString("filename");
m_densityMultiplier = paramSet.getFloat("densityMultiplier", 1.0f);
m_worldToMedium = paramSet.getTransform("toWorld", Transform()).inverse();
}
BoxFilter(const ParamSet& paramSet)
{
float radius = paramSet.getFloat("radius", 0.5f);
m_size.x = m_size.y = radius;
}