[TOptional](API\Runtime\Core\IO\TOptional)< FVector3d > GetCompilerTag ( const [FNiagaraVariableBase](API\Plugins\Niagara\FNiagaraVariableBase) & InVar, const [FNiagaraParameterStore](API\Plugins\Niagara\FNiagaraParameterStore) * FallbackParameterStore ) const