Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Depth Of Field
VP_XMB_DOF
Parameter: Motion Blur
VP_XMB_MOTIONBLUR
Parameter: Motion Subdivisions
VP_XMB_MOTION_SAMPLES_MOTION
Parameter: Deformation Subdivisions
VP_XMB_MOTION_SAMPLES_DEFORMATION
Parameter: Hair Subdivisions
VP_XMB_MOTION_SAMPLES_HAIR
Parameter: Sampler
VP_XMB_RAYTRACING_SAMPLER
Parameter: Progressive Mode
VP_XMB_RAYTRACING_INTERACTIVE_MODE
Parameter: Progressive Pass Count
VP_XMB_RAYTRACING_INTERACTIVE_PASSES
Parameter: Progressive Time Limit (minutes)
VP_XMB_RAYTRACING_INTERACTIVE_TIME
Parameter: Progressive Pass Count Limit
VP_XMB_RAYTRACING_INTERACTIVE_NET
Parameter: Sampling Quality
VP_XMB_RAYTRACING_QUALITY
Parameter: Sampling Subdivisions
VP_XMB_RAYTRACING_SAMPLES
Parameter: Shading Subdivisions (Min)
VP_XMB_RAYTRACING_SAMPLES_SHADING_MIN
Parameter: Shading Subdivisions (Max)
VP_XMB_RAYTRACING_SAMPLES_SHADING_MAX
Parameter: Shading Error Threshold
VP_XMB_RAYTRACING_SAMPLES_SHADING_ERROR
Parameter: Shading Transparency Check
VP_XMB_RAYTRACING_SAMPLES_SHADING_TRANS
Parameter: HDR Threshold
VP_XMB_RAYTRACING_SAMPLES_HDR_THRESHOLD
Parameter: Blurriness Subdivision (Max)
VP_XMB_RAYTRACING_SAMPLES_BLURRY_SHADING
Parameter: Shadow Subdivision (Max)
VP_XMB_RAYTRACING_SAMPLES_BLURRY_LIGHT
Parameter: Ambient Occlusion Subdivision (Max)
VP_XMB_RAYTRACING_SAMPLES_BLURRY_AO
Parameter: Subsurface Scattering Subdivision (Max)
VP_XMB_RAYTRACING_SAMPLES_BLURRY_SSS
Parameter: Indirect Illumination
VP_XMB_RAYTRACING_SAMPLES_GI_ENABLED
Parameter: Diffuse Depth
VP_XMB_RAYTRACING_SAMPLES_GI_DEPTH
Parameter: Sampling Subdivisions
VP_XMB_RAYTRACING_SAMPLES_GI_SAMPLES
Parameter: Raytracing Engine
VP_XMB_RAYTRACING_ADVANCED_ENGINE
Parameter: Quick Preview
VP_XMB_RAYTRACING_ADVANCED_PREVIEW
Parameter: Quick Preview Start Resolution
VP_XMB_RAYTRACING_ADVANCED_PREVIEW_MIN
Parameter: Quick Preview End Resolution
VP_XMB_RAYTRACING_ADVANCED_PREVIEW_MAX
Parameter: Debug Information Level
VP_XMB_RAYTRACING_ADVANCED_STATS
Parameter: DEBUG - No Shading
VP_XMB_RAYTRACING_DEBUG_NO_SHADE
Parameter: DEBUG - Light Sources
VP_XMB_RAYTRACING_DEBUG_LUX
Parameter: DEBUG - Lock Time
VP_XMB_RAYTRACING_DEBUG_LOCK_TIME
Parameter: DEBUG - Time Ratio
VP_XMB_RAYTRACING_DEBUG_TIME
Parameter: DEBUG - Sampling Mode
VP_XMB_RAYTRACING_DEBUG_SAMPLING