Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Test Only
GV_RAY_TEST_ONLYParameter: Global Coordinates
GV_RAY_GLOBALParameter: Ray Point1
GV_RAY_INPUT_POINT1Parameter: Ray Point2
GV_RAY_INPUT_POINT2Parameter: Collision
GV_RAY_OUTPUTParameter: Hit Position
GV_RAY_OUTPUT_HITPOSParameter: Face Index
GV_RAY_OUTPUT_FACE_INDEXParameter: Distance
GV_RAY_OUTPUT_DISTANCEParameter: Is Backface
GV_RAY_OUTPUT_BACKFACE