Should I remove 3D faces behind other faces

When making game in unreal engine, should I remove faces that will 100% never be visible to the camera, because they are inside another object?

For example these faces under this beer tap, which will always be inside bar table (not my model, just example image)

Or are those faces 100% free in terms of performace because occlusion culling?

From what I understand, if that’s a Nanite mesh, Nanite prefers meshes to be watertight so they cluster better. In that case, it would be worth it to keep those few faces… plus, they don’t cost much with Nanite. If it’s not, I always just delete unseen geo, but that’s because that’s the way I was taught - less polys = better! :slight_smile:

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