The entire sequence was shot in green matte and was later composited with another sequence which was shot separately. "Our challenge involved 3D tracking of shots and matching static BG plates. We had stitched the BG's in 3D, composited the environment and matched to the shots. (No of shots - 15)
In the market sequence, Abhishek along with the other co-stars, were shot against the chroma background and later replaced with market BG plate.
Using the chroma technique, Abhishek and other stars were shot against chroma background and seats which were later replaced by footage taken in a congested area of Delhi with empty car seats.
After shooting Amitabh and Abhishek on a chroma background, the heaven was designed on the basis of the real Delhi terrace with heavenly white look. The background was made through matte painting and the environment was computer generated. (No of shots :15)
The Taj Mahal sequence was actually shot in green matte because of problem with permissions. Later using the reference of old building and images, a separate new background and location was created in computer graphics (CG) and composited with chroma background. The light coming from the window and falling over Sonam Kapoor, was created in 3D. (No of shots: 11)