try to invert substraction by multiplication
const TYPE correctionFactor = rp.getDampingFactor() *((absorptionInVoxel - fp)/ denom);
File is FreeartAlgorithm.hpp. Line is 850
const TYPE correctionFactor = rp.getDampingFactor() *((absorptionInVoxel - fp)/ denom);
File is FreeartAlgorithm.hpp. Line is 850