Tim Hobson claims occlusion culling is the most expensive culling in unreal, and its on by default, should it be off for VR and instead us distance culling? : r/unrealengine
Visibility and Occlusion Culling | Unreal Engine 4.27 Documentation
James Baxter on Twitter: "#UE4 Tip - You can write translucent materials into the Custom Depth Buffer, allowing you to do edge-detection and depth-based occlusion culling in the material. This requries no