The young and ambitious racing champion Lightning McQueen is speeding down the fast track toward success, fame, and everything he has ever wanted—until an unexpected detour on the dusty Route 66 forces him to slow down. His “want it all, want it now” attitude is put to the test when a small, forgotten town shows McQueen what he’s been missing in his high-octane life.
In Cars, Pixar’s visual challenge was tied to rendering reflective materials and realistically animating vehicles along complex routes. To achieve believable surfaces on glossy car bodies and streets illuminated by ambient light, Ray Tracing was used, calculating how light interacts with objects and materials to generate realistic reflections and bounces.
Ray Tracing is a rendering algorithm that traces light rays from the camera to the surfaces in the scene, calculating reflections, refractions, and interactions with different materials in a physically accurate way. In Cars, this allowed for realistic representation of glossy car bodies, paved roads, and the reflective surfaces of surrounding objects.
Ground Locking is a procedural animation system that automatically aligns a 3D car model to the path defined by the road, adjusting the vehicle’s position and orientation to curves and terrain undulations. This allowed animators to focus on the characters’ performances, while the software ensured that the cars always remained “stuck” to the trajectory, avoiding overlap errors or unnatural movements.
