Drill made of a hundred Rajinikanth Robots

There were many versions made in the pre-visualization stage of the scene where in the army of robots forms a drill that goes underground to emerge as one massive robot. Frankie Chung, a VFX supervisor from Hong Kong, who has Kung Fu Hustle and Kill Bill to his credit, helped the team execute this climatic sequence. The dust particles added in the shot where the drill starts rotating blended very well with the CGI and live action layers.

The most challenging scene

Besides the climax sequence which proved to be the most challenging sequence, Srinivas the vfx supervisor of the film emphasizes on executing the dual role scene played by Rajinikanth' characters Dr. Vaseegaran and the robot Chitti. Instead of using a motion control rig which is usually used to film dual role sequences that have movement, Srinivas used a regular trolley track, super 35mm film and rhythmic beep sounds. During post production both layer movements were matched using tracking software. Because of elaborate setup process of motion control rig, it would've taken an astounding five years to shoot the entire film. The motion control rig was used for a mere 10 days to film the complicated multiple character shots.