c4d_base/description/tphong.hParameters are accessed with cinema::C4DAtom::GetParameter() and cinema::C4DAtom::SetParameter(). See Parameters.
Parameter: Angle Limit
PHONGTAG_PHONG_ANGLELIMITParameter: Phong Angle
PHONGTAG_PHONG_ANGLEParameter: Use Edge Breaks
PHONGTAG_PHONG_USEEDGESParameter: Style
PHONGTAG_STYLEPHONGTAG_STYLE_UNIFORMPHONGTAG_STYLE_ANGLE_WEIGHTEDPHONGTAG_STYLE_AREA_WEIGHTEDPHONGTAG_STYLE_ANGLE_AREA_WEIGHTEDPHONGTAG_STYLE_SQUARE_AREA_WEIGHTEDParameter: Create Normal Tag
PHONGTAG_CREATE_NORMAL_TAG