Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Priority
ID_CA_JOINT_OBJECT_PRIORITY
Parameter: Bone
ID_CA_JOINT_OBJECT_BONE_ALIGN
Parameter: Axis
ID_CA_JOINT_OBJECT_BONE_AXIS
Parameter: Align
ID_CA_JOINT_OBJECT_ALIGN_AXIS
Parameter: Length
ID_CA_JOINT_OBJECT_LENGTH
Parameter: Display
ID_CA_JOINT_OBJECT_BONE_DISPLAY
Parameter: Size
ID_CA_JOINT_OBJECT_BONE_SIZE_MODE
Parameter: Size
ID_CA_JOINT_OBJECT_BONE_SIZE
Parameter: Display
ID_CA_JOINT_OBJECT_JOINT_DISPLAY
Parameter: Size
ID_CA_JOINT_OBJECT_JOINT_SIZE_MODE
Parameter: Size
ID_CA_JOINT_OBJECT_JOINT_SIZE
Parameter: Weight
ID_CA_JOINT_OBJECT_JOINT_IK_WEIGHT
Parameter: Stretch
ID_CA_JOINT_OBJECT_JOINT_IK_STRETCH
Parameter: Use Preferred
ID_CA_JOINT_OBJECT_JOINT_IK_PREFERRED_ROT_LINK
Parameter: Set
ID_CA_JOINT_OBJECT_JOINT_IK_PREFERRED_SET
Parameter: Weight
ID_CA_JOINT_OBJECT_JOINT_IK_PREFERRED_ROT_WEIGHT
Parameter: Preferred
ID_CA_JOINT_OBJECT_JOINT_IK_PREFERRED_ROT
Parameter: Strength
ID_CA_JOINT_OBJECT_JOINT_IK_LIMITROT_STRENGTH
Parameter: Limit Heading
ID_CA_JOINT_OBJECT_JOINT_IK_USE_ROT_H
Parameter: Limit Pitch
ID_CA_JOINT_OBJECT_JOINT_IK_USE_ROT_P
Parameter: Limit Bank
ID_CA_JOINT_OBJECT_JOINT_IK_USE_ROT_B
Parameter: Minimum Rotation
ID_CA_JOINT_OBJECT_JOINT_IK_MIN_ROT
Parameter: Maximum Rotation
ID_CA_JOINT_OBJECT_JOINT_IK_MAX_ROT
Parameter: Enable
ID_CA_JOINT_OBJECT_MIRROR_ENABLE
Parameter: Hub
ID_CA_JOINT_OBJECT_BONE_HUB
Parameter: Mirror
ID_CA_JOINT_OBJECT_JOINT_MIRROR_LINK
Parameter: Origin
ID_CA_JOINT_OBJECT_MIRROR_ORIGIN
Parameter: Plane
ID_CA_JOINT_OBJECT_MIRROR_PLANE
Parameter: Object
ID_CA_JOINT_OBJECT_MIRROR_ORIGIN_LINK
Parameter: Mix
ID_CA_JOINT_OBJECT_MIRROR_COLOR_MIX
Parameter: Color
ID_CA_JOINT_OBJECT_MIRROR_COLOR