He was interacting with media at the trailer launch of "Happy Phirr Bhag Jayegi" along with actors Diana Penty, Sonakshi Sinha, Ali Fazal, Jassi Gill, Aparshakti Khurana, Piyush Mishra, co-producer Krishika Lulla and director Mudassar Aziz here on Wednesday.
With Salman and Shah Rukh coming together in a song in "Zero", a teaser of which released during Eid, Rai, asked how it felt working with two superstars, said: "I was very happy there."
Asked whether it adds pressure on a director while directing both of them in one frame, he said: "I don't think so.. I have been very fortunate in that way. I am not telling this as a director, I am telling you this as a human being.
"If you meet somebody and if you understand that person while interacting or spending time with him then, he doesn't give you vibes of a star. It creates such a relationship or an atmosphere where they never made me realize that both of them are the superstars with their greatness."
In "Happy Bhag Jayegi", the story of the film was shifted to Pakistan with whom India has issues from several years and in "Happy Phirr Bhag Jayegi", the story is shifted to China with which India also has issues from several years.
Rai, to a query whether it's a conscious effort on their side to show relationship between these countries with India in a sarcastic manner, said: "I think at the end of the day we make films and we can't go beyond that."
"We have film as a medium through which we put across two-four things among the audience and I don't know to what extent it affects people. Our main aim is to entertain the audience but I feel if we can connect happiness with these places then there is nothing wrong in that. If we can connect these political and security issues which India has with China or Pakistan along with happiness, then it's amazing," he said.
"Through this film, we are trying to spread happiness wherever we are observing conflict. We will not able to solve these things but through this medium, if we can offer happiness, entertainment and cordial relationship among the audience of these countries then there is nothing better than that," he said.
"Zero" is a science fiction romantic drama film written by Himanshu Sharma and directed by Rai.
Jointly produced by Rai and Red Chillies Entertainment's Gauri Khan, it stars Shah Rukh Khan, Katrina Kaif and Anushka Sharma, with Abhay Deol and Tigmanshu Dhulia in important roles and is slated to release on December 21.