Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Cast Shadows
COMPOSITINGTAG_CASTSHADOW
Parameter: Receive Shadows
COMPOSITINGTAG_RECEIVESHADOW
Parameter: Self Shadowing
COMPOSITINGTAG_SELFSHADOW
Parameter: Seen by Camera
COMPOSITINGTAG_SEENBYCAMERA
Parameter: Seen by Rays
COMPOSITINGTAG_SEENBYRAYS
Parameter: Seen by GI
COMPOSITINGTAG_SEENBYGI
Parameter: Compositing Background
COMPOSITINGTAG_BACKGROUND
Parameter: Compositing Background for HDR Maps
COMPOSITINGTAG_BACKGROUND_GI
Parameter: Seen by Transparency
COMPOSITINGTAG_SEENBYTRANSPARENCY
Parameter: Seen by Refraction
COMPOSITINGTAG_SEENBYREFRACTION
Parameter: Seen by Reflection
COMPOSITINGTAG_SEENBYREFLECTION
Parameter: Seen by AO
COMPOSITINGTAG_SEENBYAO
Parameter: Force Antialiasing
COMPOSITINGTAG_AAOVERWRITE
Parameter: Antialiasing Min
COMPOSITINGTAG_AAMINLEVEL
Parameter: Antialiasing Max
COMPOSITINGTAG_AAMAXLEVEL
Parameter: Antialiasing Threshold
COMPOSITINGTAG_AATHRESHOLD
Parameter: Matte Object
COMPOSITINGTAG_MATTEOBJECT
Parameter: Matte Color
COMPOSITINGTAG_MATTECOLOR
Parameter: Enable GI Parameters
COMPOSITINGTAG_GIENABLED
Parameter: Intensity Ratio
COMPOSITINGTAG_GIINTENSITY
Parameter: Stochastic Samples Ratio
COMPOSITINGTAG_GIQUALITY
Parameter: Record Density Ratio
COMPOSITINGTAG_GIDENSITY
Parameter: Enable Forced QMC Sampling
COMPOSITINGTAG_GIQMC
Parameter: Enable Transparency Overlook
COMPOSITINGTAG_GITRANSPARENCY
Parameter: Enable Interpolation Grouping
COMPOSITINGTAG_GIINTERPOLATION
Parameter: Mode
COMPOSITINGTAG_EXCLUSION_MODE
Parameter: Objects
COMPOSITINGTAG_EXCLUSION_LIST
Parameter: Enable Buffer A
COMPOSITINGTAG_ENABLECHN0
Parameter: Object Buffer A
COMPOSITINGTAG_IDCHN0
Parameter: Enable Buffer B
COMPOSITINGTAG_ENABLECHN1
Parameter: Object Buffer B
COMPOSITINGTAG_IDCHN1
Parameter: Enable Buffer C
COMPOSITINGTAG_ENABLECHN2
Parameter: Object Buffer C
COMPOSITINGTAG_IDCHN2
Parameter: Enable Buffer D
COMPOSITINGTAG_ENABLECHN3
Parameter: Object Buffer D
COMPOSITINGTAG_IDCHN3
Parameter: Enable Buffer E
COMPOSITINGTAG_ENABLECHN4
Parameter: Object Buffer E
COMPOSITINGTAG_IDCHN4
Parameter: Enable Buffer F
COMPOSITINGTAG_ENABLECHN5
Parameter: Object Buffer F
COMPOSITINGTAG_IDCHN5
Parameter: Enable Buffer G
COMPOSITINGTAG_ENABLECHN6
Parameter: Object Buffer G
COMPOSITINGTAG_IDCHN6
Parameter: Enable Buffer H
COMPOSITINGTAG_ENABLECHN7
Parameter: Object Buffer H
COMPOSITINGTAG_IDCHN7
Parameter: Enable Buffer I
COMPOSITINGTAG_ENABLECHN8
Parameter: Object Buffer I
COMPOSITINGTAG_IDCHN8
Parameter: Enable Buffer J
COMPOSITINGTAG_ENABLECHN9
Parameter: Object Buffer J
COMPOSITINGTAG_IDCHN9
Parameter: Enable Buffer K
COMPOSITINGTAG_ENABLECHN10
Parameter: Object Buffer K
COMPOSITINGTAG_IDCHN10
Parameter: Enable Buffer L
COMPOSITINGTAG_ENABLECHN11
Parameter: Object Buffer L
COMPOSITINGTAG_IDCHN11
Parameter: Shadow Catcher Alpha
COMPOSITINGTAG_RPRSHADOWCATCHER
Parameter: Light Portal
COMPOSITINGTAG_RPRLIGHTPORTAL
Parameter: Object Group ID
COMPOSITINGTAG_RPROBJECTGROUPID