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Caveats

  • 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.
  • Single indexed face sets may be more efficient than multiple copies of objects instanced and transformed.
  • 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!)