A rendering method for 3D scenes where rays are iteratively advanced (marched) into the scene until they intersect with a surface or volume. Unlike standard ray tracing which solves for intersection analytically (e.g., ray-triangle intersection), ray marching steps along the ray, often using a Signed Distance Function (SDF) to determine the step size. In the context of NeRFs, it is used to accumulate color and density values from a neural network along viewing rays to synthesize an image.
A computer graphics technique dating back to the 1980s, now fundamental to Neural Radiance Fields (NeRFs).
The standard rendering algorithm for neural volumetric fields (NeRF) and procedural SDF rendering.