Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Algorithm
ID_REMESHALGORITHM
Parameter: Polygon Type
ID_REMESH_POLYGONTYPE
Parameter: Polygon Target Mode
ID_REMESH_POLYGONTARGET_MODE
Parameter: Mesh Density
ID_REMESH_POLYGONSCALE
Parameter: Polygon Count
ID_REMESH_POLYGONTARGET
Parameter: Density Map
ID_REMESH_QUADREMESH_DENSITYMAP
Parameter: Density Scale
ID_REMESH_QUADREMESH_DENSITYMAP_SCALE
Parameter: Keep Outline
ID_REMESH_KEEPOUTLINE
Parameter: Keep Creases
ID_REMESH_CREASES
Parameter: Edge Angle
ID_REMESH_EDGEANGLE
Parameter: Smooth Iterations
ID_REMESH_SMOOTHITERATIONS
Parameter: Only Quadrangles
ID_REMESH_QUADONLY
Parameter: Adaptive Count
ID_REMESH_QUADREMESH_ADAPTIVE
Parameter: Adaptiveness
ID_REMESH_QUADREMESH_ADAPTIVENESS
Parameter: Detect Hard Edges
ID_REMESH_QUADREMESH_HARDEDGEMODE
Parameter: Hard Edge Selection
ID_REMESH_QUADREMESH_HARDEDGESELECTION
Parameter: Symmetric X
ID_REMESH_QUADREMESH_SYMMETRYX
Parameter: Symmetric Y
ID_REMESH_QUADREMESH_SYMMETRYY
Parameter: Symmetric Z
ID_REMESH_QUADREMESH_SYMMETRYZ
Parameter: Flow Splines
ID_REMESH_GUIDE_SPLINES
Parameter: Transfer Attributes
ID_REMESH_TRANSFER_ATTRIBUTES