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by curmudgeon9 3163 days ago
What they're doing isn't even occlusion culling. It's frustum culling.

https://docs.unity3d.com/Manual/OcclusionCulling.html

edit: I wouldn't even call it frustum calling since I don't think frustum culling makes much sense in a retained mode API (the frustum culling happens when rendering the retained mode representation through the underlying immediate mode API). 'Level of detail' maybe.