Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Active
SLA_LUMAS_DIFFUSE_ACTIVEParameter: Color
SLA_LUMAS_DIFFUSE_COLORParameter: Algorithm
SLA_LUMAS_DIFFUSE_ALGORITHMParameter: Roughness
SLA_LUMAS_DIFFUSE_ROUGHNESSParameter: Illumination
SLA_LUMAS_DIFFUSE_ILLUMINATIONParameter: Contrast
SLA_LUMAS_DIFFUSE_CONTRASTParameter: Active
SLA_LUMAS_SPECULAR1_ACTIVEParameter: Color
SLA_LUMAS_SPECULAR1_COLORParameter: Intensity
SLA_LUMAS_SPECULAR1_INTENSITYParameter: Size
SLA_LUMAS_SPECULAR1_SIZEParameter: Contrast
SLA_LUMAS_SPECULAR1_CONTRASTParameter: Glare
SLA_LUMAS_SPECULAR1_GLAREParameter: Falloff
SLA_LUMAS_SPECULAR1_FALLOFFParameter: Active
SLA_LUMAS_SPECULAR2_ACTIVEParameter: Color
SLA_LUMAS_SPECULAR2_COLORParameter: Intensity
SLA_LUMAS_SPECULAR2_INTENSITYParameter: Size
SLA_LUMAS_SPECULAR2_SIZEParameter: Contrast
SLA_LUMAS_SPECULAR2_CONTRASTParameter: Glare
SLA_LUMAS_SPECULAR2_GLAREParameter: Falloff
SLA_LUMAS_SPECULAR2_FALLOFFParameter: Active
SLA_LUMAS_SPECULAR3_ACTIVEParameter: Color
SLA_LUMAS_SPECULAR3_COLORParameter: Intensity
SLA_LUMAS_SPECULAR3_INTENSITYParameter: Size
SLA_LUMAS_SPECULAR3_SIZEParameter: Contrast
SLA_LUMAS_SPECULAR3_CONTRASTParameter: Glare
SLA_LUMAS_SPECULAR3_GLAREParameter: Falloff
SLA_LUMAS_SPECULAR3_FALLOFFParameter: Active
SLA_LUMAS_ANISO_ACTIVEParameter: Projection
SLA_LUMAS_ANISO_PROJECTIONParameter: Projection Scale
SLA_LUMAS_ANISO_PROJ_SCALEParameter: X Roughness
SLA_LUMAS_ANISO_X_ROUGHParameter: Y Roughness
SLA_LUMAS_ANISO_Y_ROUGHParameter: Specular 1
SLA_LUMAS_ANISO_SPEC_CHANNEL_SPEC1Parameter: Specular 2
SLA_LUMAS_ANISO_SPEC_CHANNEL_SPEC2Parameter: Specular 3
SLA_LUMAS_ANISO_SPEC_CHANNEL_SPEC3Parameter: Amplitude
SLA_LUMAS_ANISO_AMPLITUDEParameter: Scale
SLA_LUMAS_ANISO_SCALEParameter: Length
SLA_LUMAS_ANISO_LENGTHParameter: Attenuation
SLA_LUMAS_ANISO_ATTENUATIONParameter: Specular 1
SLA_LUMAS_ANISO_SCRATCH_CHANNEL_SPEC1Parameter: Specular 2
SLA_LUMAS_ANISO_SCRATCH_CHANNEL_SPEC2Parameter: Specular 3
SLA_LUMAS_ANISO_SCRATCH_CHANNEL_SPEC3