There was no guarantee that there would be an anime feature film adaptation of Takehiko Inoue’s hugely popular basketball manga series “Slam Dunk,” especially after its successful anime TV series. But not only did Toei Animation bring the beloved ’90s manga — about basketball as a psychological rite of passage through the overcoming of pain and hardship — to the big screen, but “The First Slam Dunk” (playing theatrically from GKids) is now the fifth highest-grossing anime of all time and the winner of the Japan Academy Prize for Best Animated Film. But it took five years of 2D and CG prototyping by Toei Animation (led by producer Toshiyuki Matsui) to perfect the visual look before getting the greenlight from Inoue.