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A Deep Dive into Nanite Virtualized Geometry

SIGGRAPH Advances in Real-Time Rendering · talk · Watch on YouTube

Computer graphics & renderingGame programming & engines

What it is

Brian Karis's SIGGRAPH 2021 talk explains how Unreal Engine 5's Nanite virtualized geometry works. It covers mesh import, the data structures, streaming, decompression, culling, software and hardware rasterization, and shading.

Why Hacker News recommends it

HN treats it as the definitive deep dive on Nanite, admired for the engineering ambition behind pixel-sized triangles and compute-driven rendering.

  • 7 people recommended it
  • 9 different months
  • 5 strong recommendations
  • first 2021, last 2026

What HN commenters said

  1. “the sheer amount of engineering horsepower they put into driving it into production just boggles the mind”

    Mind-blowing engineering behind Nanite's LOD system

    jjoonathan, 2021-11 · Strong recommendation · in “Full key extraction of Nvidia TSEC”

  2. “This siggraph session will expand your mind”

    Nanite blurs line between geometry and texture

    jameshart, 2021-12 · Strong recommendation · in “The Matrix Awakens: Unreal Engine 5 Techdemo [video]”

  3. “This is a really good deep dive if you’re interested”

    Deep dive on Nanite's pre-render and software rasterizer

    superb_dev, 2023-09 · Strong recommendation · in “Apple iPhone 15 Pro and iPhone 15 Pro Max”

  4. “Their YouTube channel has the excellent deep dive on the unreal engine's nanite virtual geometry system”

    Excellent deep dive on Unreal's Nanite virtual geometry

    jfim, 2026-07 · Strong recommendation · in “Advances in Real Time Rendering in Games”

  5. “Here's an hour long talk on how Unreal Engine 5's Nanite works.[1]”

    Hour-long talk on how Nanite works

    Animats, 2022-01 · Recommendation · in “Finding your home in game graphics programming”

  6. “This video might shed some light”

    Explains the many combined techniques behind Nanite

    spoiler, 2023-09 · Recommendation · in “Why Unreal Engine 5.3 is a BIG Deal [video]”

  7. “here's a SIGGRAPH talk where they go into some of the why and how of Unreal's Nanite”

    SIGGRAPH talk on the why and how of Nanite

    Gollapalli, 2025-02 · Recommendation · in “Nvidia open-source nanite: continuous level of detail (LOD) mesh library”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: nanite, unreal engine 5, software rasterizer, level of detail, gpu rendering, siggraph

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