Take a look at this unit test and try to investigate other options:
MultiPaneBSDF_SingleLayerSpecular_DualBandMaterial.cpp
Main problem is that dual band material is appoximation that should have never been used in the system and it is currently producing approximate results.
Take a look at this unit test and try to investigate other options:
MultiPaneBSDF_SingleLayerSpecular_DualBandMaterial.cppMain problem is that dual band material is appoximation that should have never been used in the system and it is currently producing approximate results.