Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Geometry Only
VP_PREVIEWHARDWARE_ONLY_GEOMETRYParameter: Workplane
VP_PREVIEWHARDWARE_DISPLAYFILTER_GRIDParameter: World Grid
VP_PREVIEWHARDWARE_DISPLAYFILTER_BASEGRIDParameter: World Axis
VP_PREVIEWHARDWARE_DISPLAYFILTER_WORLDAXISParameter: Horizon
VP_PREVIEWHARDWARE_DISPLAYFILTER_HORIZONParameter: HUD
VP_PREVIEWHARDWARE_DISPLAYFILTER_HUDParameter: Null
VP_PREVIEWHARDWARE_DISPLAYFILTER_NULLParameter: Spline
VP_PREVIEWHARDWARE_DISPLAYFILTER_SPLINEParameter: Polygon
VP_PREVIEWHARDWARE_DISPLAYFILTER_POLYGONParameter: Generator
VP_PREVIEWHARDWARE_DISPLAYFILTER_GENERATORParameter: Subdivision Surface
VP_PREVIEWHARDWARE_DISPLAYFILTER_HYPERNURBSParameter: Deformer
VP_PREVIEWHARDWARE_DISPLAYFILTER_DEFORMERParameter: Field
VP_PREVIEWHARDWARE_DISPLAYFILTER_FIELDParameter: Environment
VP_PREVIEWHARDWARE_DISPLAYFILTER_SCENEParameter: Camera
VP_PREVIEWHARDWARE_DISPLAYFILTER_CAMERAParameter: Light
VP_PREVIEWHARDWARE_DISPLAYFILTER_LIGHTParameter: Joint
VP_PREVIEWHARDWARE_DISPLAYFILTER_JOINTParameter: Particle
VP_PREVIEWHARDWARE_DISPLAYFILTER_PARTICLEParameter: Hair
VP_PREVIEWHARDWARE_DISPLAYFILTER_HAIRParameter: Guides
VP_PREVIEWHARDWARE_DISPLAYFILTER_GUIDELINESParameter: Other
VP_PREVIEWHARDWARE_DISPLAYFILTER_OTHERParameter: Axis
VP_PREVIEWHARDWARE_DISPLAYFILTER_OBJECTHANDLESParameter: Multi-Select Axes
VP_PREVIEWHARDWARE_DISPLAYFILTER_MULTIAXISParameter: Handles
VP_PREVIEWHARDWARE_DISPLAYFILTER_HANDLESParameter: SDS Mesh
VP_PREVIEWHARDWARE_DISPLAYFILTER_SDSParameter: SDS Cage
VP_PREVIEWHARDWARE_DISPLAYFILTER_SDSCAGEParameter: N-gon Lines
VP_PREVIEWHARDWARE_DISPLAYFILTER_NGONLINESParameter: Animation Path
VP_PREVIEWHARDWARE_DATA_SHOWPATHParameter: Ghosting
VP_PREVIEWHARDWARE_DISPLAYFILTER_ONIONParameter: Load Preset...
VP_PREVIEWHARDWARE_DISPLAYFILTER_PRESET_LOADParameter: Save Preset...
VP_PREVIEWHARDWARE_DISPLAYFILTER_PRESET_SAVEParameter: Effects
VP_PREVIEWHARDWARE_ENHANCEDOPENGLParameter: HQ Noises
VP_PREVIEWHARDWARE_NOISEParameter: Transparency
VP_PREVIEWHARDWARE_TRANSPARENCYParameter: Shadows
VP_PREVIEWHARDWARE_SHADOWParameter: Shadowmap Size
VP_PREVIEWHARDWARE_SHADOW_MAP_SIZEParameter: Alternative Shadow Filtering
VP_PREVIEWHARDWARE_ALTERNATIVESHADOWMAPPINGParameter: Reflections
VP_PREVIEWHARDWARE_REFLECTIONSParameter: Environment Override
VP_PREVIEWHARDWARE_REFLECTIONS_ENV_OVERRIDEParameter: Rotation
VP_PREVIEWHARDWARE_REFLECTIONS_ENV_ROTATIONParameter: Screen-Space Local Reflections
VP_PREVIEWHARDWARE_REFLECTIONS_SSRParameter: Distance
VP_PREVIEWHARDWARE_REFLECTIONS_SSR_ITERATIONSParameter: Pixel Thickness
VP_PREVIEWHARDWARE_REFLECTIONS_SSR_GEOMETRY_THICKNESSParameter: Half Resolution
VP_PREVIEWHARDWARE_REFLECTIONS_SSR_HALF_RESParameter: Post Effects
VP_PREVIEWHARDWARE_POSTEFFECTParameter: Magic Bullet Looks
VP_PREVIEWHARDWARE_MAGICBULLETLOOKSParameter: SSAO
VP_PREVIEWHARDWARE_SSAOParameter: Tessellation
VP_PREVIEWHARDWARE_TESSELLATIONParameter: Depth of Field
VP_PREVIEWHARDWARE_DEPTHOFFIELDParameter: Anti-Aliased DOF
VP_PREVIEWHARDWARE_DEPTHOFFIELD_ANTIALIASEDParameter: Ignore Hidden Polygon Selections
VP_PREVIEWHARDWARE_IGNORE_HIDDEN_POLYGON_SELECTIONParameter: 32-bit Framebuffer
VP_PREVIEWHARDWARE_32BIT_DEPTHParameter: Anti-Aliasing
VP_PREVIEWHARDWARE_ANTIALIASINGParameter: Supersampling
VP_PREVIEWHARDWARE_SUPERSAMPLINGParameter: Copy Effects from Viewport
VP_PREVIEWHARDWARE_COPY_VP_EFFECTS