Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Perfect Primitive
ID_VOLUMEBUILDER_TAG_PERFECT_PRIMITIVE
Parameter: Use Mesh Points
ID_VOLUMEBUILDER_TAG_USEPOINTS
Parameter: Mesh Point Radius
ID_VOLUMEBUILDER_TAG_MESHRADIUS
Parameter: Optimize and Close Holes
ID_VOLUMEBUILDER_TAG_OPTIMIZEANDCLOSE
Parameter: Use Particle Size
ID_VOLUMEBUILDER_TAG_USEPARTICLERADIUS
Parameter: Radius
ID_VOLUMEBUILDER_TAG_RADIUS
Parameter: Density
ID_VOLUMEBUILDER_TAG_DENSITY
Parameter: Scale Along
ID_VOLUMEBUILDER_TAG_SPLINERADIUS_SCALESPLINE
Parameter: Scale per Segment
ID_VOLUMEBUILDER_TAG_SPLINERADIUS_PERSEGMENT
Parameter: Velocity Scale
ID_VOLUMEBUILDER_TAG_VELOCITY_SCALE
Parameter: Convert From
ID_VOLUMEBUILDER_TAG_VECTOR_CONVERSION_MODE
Parameter: Inside Voxel Falloff
ID_VOLUMEBUILDER_TAG_INTERIOR_VOXEL_FALLOFF
Parameter: Maximum Voxel Falloff
ID_VOLUMEBUILDER_TAG_INFINITEFALLOFF
Parameter: Surface Threshold
ID_VOLUMEBUILDER_TAG_ISO
Parameter: Creation Space
ID_VOLUMEBUILDER_TAG_SOURCETYPE
Parameter: P
ID_VOLUMEBUILDER_TAG_BBPOSITION
Parameter: S
ID_VOLUMEBUILDER_TAG_BBSIZE
Parameter: R
ID_VOLUMEBUILDER_TAG_BBROTATION
Parameter: Override Box Matrix
ID_VOLUMEBUILDER_TAG_FIELD_CREATION_REF
Parameter: Create Controller
ID_VOLUMEBUILDER_TAG_CREATE_CONTROLLER
Parameter: Interior Voxel Range
ID_VOLUMEBUILDER_TAG_HALF_BAND_MESH_INTERIOR
Parameter: Exterior Voxel Range
ID_VOLUMEBUILDER_TAG_HALF_BAND_MESH_EXTERIOR
Parameter: Spline Voxel Range
ID_VOLUMEBUILDER_TAG_HALF_BAND_SPLINE
Parameter: Particle Voxel Range
ID_VOLUMEBUILDER_TAG_HALF_BAND_PARTICLE