During his work at father's new studio, he started to learn editing, lighting and cinematography. His first cinematography teacher was Paul Matthias, the first photographer of the "Nawajeewana" film studio. Prior to that, Matthias was the
camera operator of the famous Indian filmmaker Mehboob. After few years, Daya started camera direction of W.A.B. de Silva, who was the first Sri Lankan cameraman in Sinhala cinema. He first handled camera in the film
Rodi Kella, even though prior to completing the shooting, his father died. Shortly thereafter, he lost the ownership of "Nawajeewana" film studio. His maiden camera direction was in 1965 film
Adarayay Karunawai directed by Ananda Jayaratne, but first screened film was
Patchara in 1964. He was also the cameraman in the original
Tamil language film,
Thottakkari. He was the cinematographer in every film he directed except
Raja Daruwo. His film
Pahai Hathalis Paha was never screened. He becomes one of the most popular filmmakers of the era when the film industry is in a downturn. The dialogue of original 1953 film
Sujatha was written by his father. In the re-creation of the film by Daya in 1994, he re-filmed his father's song,
Narilatha Pushpe. His 2002 film
Seethala Gini Kandu also included a song composed by his father. His 1990 film
Madhu Sihina was the last film acted by popular actor
Vijaya Kumaratunga. Kumaratunga was assassinated on his way to Colombo after filming. In addition to his directing, he also provided cinematography and lighting for feature films such as
Madhu Sihina and
Mihidum Sihina. ==Filmography==