IF LEBRON JAMES'S emphatic dunk in the second quarter of Game 2 of the NBA Finals looked spectacular on TV, imagine how it appeared to the 14,000 Cavaliers fans who packed Quicken Loans Arena to see a live broadcast of the game in high-definition 3-D on four 40-foot movie screens. "I'm a physics teacher, so I'm extra-analytical," said 42-year-old Ron Fabo, who was at the free screening. "But even I thought that, when LeBron was coming at me for a dunk, it's like really being courtside." The game was shot by four HD cameras that split images into two pictures, one for each eye. They were then projected at the Q using high-tech DLP projectors. (A pair of 3-D glasses merges the images.) While it will be years before the technology hits homes, David Stern, who was wowed by 3-D clips at a viewing party last June, is envisioning 3-D parties across the globe. "The whole thing was just absolutely amazing," Fabo gushed. "I'd pay 10 dollars to go see that."