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How Real Time Light Simulation Works

Real-time path tracing simulates the true physics of light, which uses ray tracing as one component of a larger light simulation system. This provides real-time experiences with true to life shadows, reflections and global illumination. Compared to rasterization, which is equivalent to casting one set of rays from a single point that stops at the first thing they hit, and ray tracing, which casts rays from many points in any direction, path tracing randomly samples all lights in a scene. Rays are traced over multiple bounces back to their light source, directly lighting objects or characters and indirectly lighting rooms or environments.