Nvidia's RTX Mega Geometry to enhance The Witcher 4's forests

Nvidia will use a new RTX Mega Geometry foliage system to improve the path-traced trees in The Witcher 4, the Unreal Engine 5-based game famous for its dense forests. The announcement came as part of Nvidia's GeForce On community update.

By updating clusters of triangles in batches, Nvidia says the system significantly reduces CPU overhead and boosts performance. The company also pairs Mega Geometry with opacity micromaps to make ray tracing of complex, semi-transparent objects like leaves more efficient, applying the methods to the "extreme challenge" of the game's Nanite-enhanced foliage.

The approach resembles the process used in Indiana Jones and The Great Circle, though Nvidia will detail any differences in a talk later in the week. Unreal Engine 5.6's voxel-based foliage system may also help rein in GPU demands, and Nvidia's demo reel showed particularly lush trees; the in-person experience is expected in 2027.

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