Add wavelength parameter to refractiveIndex functions

Redmine: #1858

Core/Material/HomogeneousMaterial.cpp

@@ -72,12 +72,12 @@ HomogeneousMaterial HomogeneousMaterial::inverted() const
     return result;
 }
 
-complex_t HomogeneousMaterial::refractiveIndex() const
+complex_t HomogeneousMaterial::refractiveIndex(double) const
 {
     return m_refractive_index;
 }
 
-complex_t HomogeneousMaterial::refractiveIndex2() const
+complex_t HomogeneousMaterial::refractiveIndex2(double) const
 {
     return m_refractive_index*m_refractive_index;
 }
@@ -96,8 +96,7 @@ complex_t HomogeneousMaterial::scalarSubtrSLD(const WavevectorInfo& wavevectors)
 {
     double wavelength = wavevectors.getWavelength();
     double prefactor = M_PI/wavelength/wavelength;
-    complex_t refractive_index = refractiveIndex();
-    return prefactor * refractive_index * refractive_index;
+    return prefactor * refractiveIndex2(wavelength);
 }
 
 Eigen::Matrix2cd HomogeneousMaterial::polarizedSubtrSLD(const WavevectorInfo& wavevectors) const

Core/Material/HomogeneousMaterial.h

@@ -47,8 +47,8 @@ public:
     //! Constructs a material with inverted magnetization
     HomogeneousMaterial inverted() const;
 
-    complex_t refractiveIndex() const;
-    complex_t refractiveIndex2() const;
+    complex_t refractiveIndex(double wavelength) const;
+    complex_t refractiveIndex2(double wavelength) const;
 
     //! Indicates whether the interaction with the material is scalar.
     //! This means that different polarization states will be diffracted equally