What is the test for determining whether a case involves extrinsic rather than intrinsic fraud?

No abstract formula exists for determining whether a particular case involves extrinsic, rather than intrinsic, fraud. "It is necessary to examine the facts in the light of the policy that a party who failed to assemble all his evidence at the trial should not be privileged to relitigate a case, as well as the policy permitting a party to seek relief from a judgment entered in a proceeding in which he was deprived of a fair opportunity fully to present his case." (Jorgensen v. Jorgensen, supra, 32 Cal.2d at p. 19, 193 P.2d 728.)