Depends on what the eye can see. If you are doing an airplane simulator and see massive amounts of land, you will likely set the cull distance for low poly trees to very far away, while removing most of the grass. If you are building a first person shooter where most of the map can’t be seen at once, say a city environment, you can get away with lower cull distances. try to have as few plants on screen as possible while making it look OK to the eye.
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