Aim for minimal "Perceived" Download Time
Basic idea: divide your world into three "waves" of download
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First (seconds): visible & nearby key landmarks of the scene
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Set initial viewpoint indoors to make that a smaller set
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Second (tens of seconds): detail required for best navigation in initial
entry location(s)
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Third (trickles in as needed): Finishing touches and content further removed
from entry location(s) and not needed for navigation
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Think about Inlining anything which is a candidate for LOD'ing
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Insides of houses in a town, contents of refrigerator