Culling

BRG Instanced Renderer uses a multi-level GPU-driven culling pipeline to ensure only visible instances consume rendering resources. All culling runs entirely on the GPU via compute shaders, keeping CPU overhead near zero regardless of instance count.

Five types of culling work together in a hierarchical pipeline:

Frustum Culling

Instances outside the camera's field of view are excluded. Tested at both the chunk level and per-instance level for maximum efficiency.

Occlusion Culling

Chunks fully hidden behind occluders are skipped using Unity's baked occlusion data. Enable via Use BRG Occlusion Culling on the Config.

Distance Culling

Instances beyond a configurable distance are not rendered. Set per-group via BRG Instance Group or per-terrain via BRG Terrain Registerer.

Screen-Size Culling

Instances too small on screen are culled automatically, with optional fade-out. Configured per-prefab via BRG Prototype Extra Data.

Dynamic Density Culling

Gradually thins out instances at distance using a deterministic hash — no flickering. See Dynamic Density for details.

Shadow rendering has its own dedicated culling pass, with per-cascade frustum testing and per-prototype cascade limits. See Shadow Optimization for details.