View Volume Culling
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Method: Test each bbox against view volume before traversing,
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if the bbox is outside view volume, don't traverse
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if the bbox is inside view volume, traverse its children (but test each
one)
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This means that bbox visibility checking has to be fast
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useful to know, because then simple visibility sensors are fast, too.
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Usual Savings: 2-10X speedup
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Usual Costs: Low to none: Author tools should hint in Inline BBox field