Heath Ledger (r) died from an accidental overdose of six different types of prescription drugs in his New York apartment.
Director Terry Gilliam said replacing Heath Ledger's part with three actors to complete his final film after he died has worked.
Filming of The Imaginarium of Doctor Parnassus was suspended when the star was found dead in January.
Jude Law, Johnny Depp and Colin Farrell will now appear as Ledger's character, but scenes he had previously filmed will be included in the movie.
"I've seen it and it works and it's great," said Gilliam.
"It's the last chance to see Heath and he's brilliant," he added.
Terry Gilliam is pleased with the film
"It [filming] stopped for a bit until the three heroes as they're now known Jude Law, Johnny Depp and Colin Farrell came to the rescue and finished off Heath's part.
"So you ended up with four actors playing one character."
Gilliam admitted he had been worried whether Ledger would have "accepted" the idea of having three actors replace him, but now he has seen it he is pleased with the decision.
In March the director admitted filming had resumed in Vancouver with the blessing of Ledger's family.
Ledger died from an accidental overdose of six different types of prescription drugs in his New York apartment.
Batman film The Dark Knight is currently being screened in cinemas across the UK, in which Ledger played the joker.