Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: MATERIAL_PAGE_PROPERTIES
MATERIAL_PAGE_PROPERTIES
Parameter: Color
FOGSHADER_COLOR
Parameter: Samples
FOGSHADER_SAMPLES
Parameter: Volumetric
FOGSHADER_VOLUMETRIC
Parameter: Frequency
FOGSHADER_SCALE
Parameter: Type
FOGSHADER_TYPE
Parameter: Thickness
FOGSHADER_THICKNESS
Parameter: Decrease
FOGSHADER_DECREASE
Parameter: Turbulence
FOGSHADER_TURBULENCE
Parameter: Amplitude
FOGSHADER_AMPLITUDE
Parameter: T Frequency
FOGSHADER_FREQUENCY