Ray Tracing

Ray tracing is a rendering technique that simulates the physical behavior of light—how it bounces, refracts, reflects, and scatters off surfaces—to produce photorealistic images in real time.

Traditional real-time rendering in games relies on rasterization: a collection of computational shortcuts that approximate how light behaves. Ray tracing replaces these approximations with physics-based simulation, producing dramatically more realistic lighting, reflections, and shadows. The most advanced form, path tracing, traces every ray of light through a scene and has quietly become the biggest visual leap in gaming since the transition to 3D.

NVIDIA's RTX platform, built around dedicated ray-tracing hardware in their GPUs, has been the primary driver of adoption. As of 2026, over 800 games support ray tracing, and full path tracing—once considered too expensive for real-time applications—is becoming viable through AI-assisted upscaling technologies like DLSS (Deep Learning Super Sampling). These neural rendering techniques use AI to reconstruct high-resolution frames from lower-resolution ray-traced images, making the performance trade-off increasingly favorable.

As 3D engines and GPUs continue to advance, ray tracing and path tracing will become the default rendering approach for games, metaverse experiences, and real-time 3D applications—collapsing the visual gap between pre-rendered film and interactive media.