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Instancing--Using a few for repeated objects can be useful, but there
may be a hidden cost. On PC platforms, instances may be treated in
memory as multiple copies, and so may be inefficient.
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Single indexed face sets may be more efficient than multiple copies of
objects instanced and transformed.
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Browser APIs may handle primitives in different ways. You can do two
things: Ignore it, or build a model as an indexed face set (but then
you lose the advantages of the primitives!)
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