I built a custom open-world engine for the N64. In this video, I break down how I achieved a seamless, massive world with zero loading screens on N64 hardware.
(00:00–00:27)
The developer demonstrates a massive open world running in real time on N64 hardware, with extremely long draw distances comparable to modern games.
(00:27–01:21)
Draw distance is controlled via near and far clipping planes, but pushing the far plane too far causes Z-fighting, where distant objects render incorrectly due to depth precision limits.
(01:21–02:56)
The root issue is the N64's 15-bit Z-buffer (~32,000 values), heavily biased toward near objects—leaving very poor precision for distant geometry, which causes rendering conflicts.
(03:15–03:35)
Adjusting the near plane helps reduce Z-fighting but introduces clipping issues for nearby objects—creating a trade-off between close detail and far visibility.
(03:35–03:56)
Key solution: render the world in two passes:
Far objects scaled down (low precision needs)
Near objects rendered normally (high detail + proper depth)
(03:56–05:10)
Uses Level of Detail (LOD):
Distant terrain = simplified tiles
Closer terrain = higher detail tiles
Tiles are dynamically swapped based on distance and visibility
(05:10–06:24)
For distant terrain, the Z-buffer is disabled and objects are drawn manually back-to-front, improving performance and avoiding extra memory costs.
(06:24–07:46)
Terrain texturing uses baked textures (high-detail visuals compressed into low-detail meshes) and chunking to avoid excessive material switching—critical for performance.
(07:46–08:25)
Introduces multi-level terrain chunks (combining tiles into larger, lower-detail versions) to significantly improve framerate.
(08:04–09:10)
Custom atmospheric perspective is implemented using the N64 color combiner instead of standard fog, enabling more realistic distance color blending.
(09:25–10:21)
Gameplay challenges of a huge map are addressed by:
Very fast traversal (hover vehicle ~180 mph)
Progressive map discovery
Minimal guidance (no heavy quest markers), encouraging exploration
(11:26–end)
The project proves that large-scale open worlds are feasible on N64, and the engine will be expanded into a full future game.
