Nvidia shows The Witcher 4 forest demo running path tracing on an RTX 4070

Nvidia published its full GDC 2026 presentation covering upcoming path tracing and micropolygon tools.

The company demonstrated a forest built from The Witcher 4 tree assets in a video.

A voxel-based LOD system turns distant trees into simple voxels while close-up pines are rendered with up to 10 million polygons.

The 5×5 km scene runs at roughly 80 fps on an RTX 5090 at 1440p, upscaled to 4K.

On an RTX 4070 the scene runs about 58 fps in 1440p DLSS Balanced (upscaling from 960p) within 12GB of VRAM; Nvidia plans to open-source the technology later this year, and The Witcher 4 is not expected before 2027.