Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Target Object
POINTPROJECTOR_LINK
Parameter: Projection Mode
POINTPROJECTOR_MODE
Parameter: Orientation
POINTPROJECTOR_ALIGNMENT
Parameter: Hierarchical
POINTPROJECTOR_INCLUDE_HIERARCHY
Parameter: Offset
POINTPROJECTOR_OFFSET
Parameter: Strength
POINTPROJECTOR_STRENGTH
Parameter: Field
POINTPROJECTOR_FALLOFF