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9
LODs, Part 2
And other LODs can be created by simplifying models: using polygon reduction or bounding volumes. Lowest level: 12 triangles. Middle level: 114 triangles. HiRes level: 242 triangles.
Use LODs if you want to keep a representation of your model in the scene. Use proximity sensors if the model's presence is transient.
For performance, balance download time with use of LODs, inlines, with scene complexity. ("Waves" of download)