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();
}
AreaLight(const ParamSet& paramSet) : Light(paramSet), m_shape(NULL)
{
m_radiance = paramSet.getColor("radiance", Color3f(1.f));
m_intersectable = true;
}