Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Density
PYRO_OBJECT_DENSITYParameter: Color
PYRO_OBJECT_COLORParameter: Temperature
PYRO_OBJECT_TEMPERATUREParameter: Fuel
PYRO_OBJECT_FUELParameter: Velocity
PYRO_OBJECT_VELOCITYParameter: Mask Velocity
PYRO_OBJECT_MASK_VELOCITYParameter: Pressure
PYRO_OBJECT_PRESSUREParameter: Divergence
PYRO_OBJECT_DIVERGENCEParameter: Dual Rest Grid
PYRO_OBJECT_RESTGRIDParameter: Highres Download
PYRO_OBJECT_HIGHRESParameter: Enabled
PYRO_OBJECT_CACHE_ENABLEDParameter: Filename
PYRO_OBJECT_CACHE_PATHParameter: Cache Paths
PYRO_OBJECT_CACHE_PATHSParameter: Template Filename
PYRO_OBJECT_CACHE_PATH_TEMPLATEParameter: Cache Scene
PYRO_OBJECT_CACHE_TRIGGER_SCENEParameter: Cache
PYRO_OBJECT_CACHE_TRIGGERParameter: Delete Selected Caches
PYRO_OBJECT_CACHE_CLEARParameter: Upres Scene
PYRO_OBJECT_CACHE_TRIGGER_SCENE_UPRESParameter: Upres Active Cache
PYRO_OBJECT_CACHE_TRIGGER_SCENE_UPRES_OLDSCENEParameter: Upres Factor
PYRO_OBJECT_UPRES_FACTORParameter: Additional Octaves
PYRO_OBJECT_UPRES_ADDITIONAL_OCTAVESParameter: Noise Strength
PYRO_OBJECT_UPRES_NOISE_STRENGTHParameter: Noise Scale
PYRO_OBJECT_UPRES_NOISE_SCALEParameter: Animation Speed
PYRO_OBJECT_UPRES_TIME_ANIMATIONParameter: Noise Falloff
PYRO_OBJECT_UPRES_FIELDSParameter: Scene
PYRO_OBJECT_SCENE_LINKParameter: Link to Default Scene
PYRO_OBJECT_LINK_TO_DEFAULT